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HomeMy WebLinkAbout20091346 Ver 6_Stormwater Approval_20151009 (2)STORMWATER IMPACT ANALYSIS & FINAL DESIGN OF STORMWATER MANAGEMENT FACILITIES HOLLY SPRINGS TOWNE CENTER - PHASE 2 KRG -11010 HOLLY SPRINGS, NORTH CAROLINA DATE: FEBRUARY 2015 PREPARED FOR: KRG NEw HILL PLACE, LLC 30 SOUTH MERIDIAN STREET, SUITE 1100 INDIANAPOLIS, IN 46204 MU MuADAMS Raleigh /Durham ■ 2905 Meridian Parkway ■ Durham, NC 27713 Charlotte ■ 11301 Carmel Commons Blvd ■ Suite 111 ■ Charlotte, NC 28226 McAdamsCo.com Designing Ton7orrow's Infrastructure & Communities JATHE TOWN OF (lolly Stormwater Design Executive Summary Springs TOWN OF HOLLY SPRINGS ENGINEERING DEPARTMENT NORTH CAROLINA Project Information Project Name: "0LL4 S M-L NC S TOW aWr. CENTEQ - PH SSG Z Phase, if applicable: Previous Project Name if applicable: NEN 1kZwYl.AcE PIN: 0 6 4 q -<-.-I - tes %g Project Contact Person: A Or.. H A C -CN % PE . C FtA Phone Number: (-I Iq) AP I- gap Email: Jo, \k Co ? mcadarn.-�ro.cotr Site Information / Overview Total Site Acreage: �t,�.SZ acres Watershed Name: ❑ Neuse River Basin ❑X Cape Fear River Basin Tributary Name: (Creek Name(s)) Total Site Impervious Area (Existing): t, UA C Total Site Impervious Area (Proposed): 1o19.534 Ac, Site Percent Impervious Area (Existing): 0.57. Site Percent Impervious Area (Proposed): yp,a'/. I Stormwater Summary Tables Please note: That each drainage area must meet the quantity and quality requirements. A. Peak Discharge Summary SEE Sv mtAo.? A '01r MU Peak Discharge Rate Table for Pre - Development Conditions Sub -Shed CN C Area tc Q1 (acres) (min.) (CFS) 1-.r,S / To%T - D EY eL09 ` &—NT( k*Avzot- r l Peak Discharge Rate Table for Post - Development Conditions Q100 Sub -Shed CN C Area tc Q1 Qioo (CFS) (acres) (min.) (CFS) (CFS; 1. 1 11. 2. 12. 3. 13. 4. I 4. 5. I 5. Total: I I Total: Drawdown calculations for the First Flush Volume and the 1 -year storm are not required for the Preliminary Stormwater Report and Calculations. However, designer shall take note that these requirements exist and should be factored into the overall stormwater management design. 16005 SW Ex. Summary Page 1 of 6 9/19/12 THE TOWN! OF golly Stormwater Design Executive Summary Springs TOWN OF HOLLY SPRINGS ENGINEERING DEPARTMENT NORTH CAROLINA B. Total Nitrogen (TN) Export Summary Method 1 (Residential Subdivisions with Unknown Building Footprints) Pre - Developed 1.7 Nitrogen Export Summary Table 4.4 Type of Land Cover Area TN Export TN Coefficient Export from (acres) (Ibs /ac /yr) Use Commercial /Industrial (Ibs /yr) Existing Forestland 1.7 Existing Pasture 4.4 Existing Residential 7.5 Existing Cropland 13.6 Existing 13 Commercial /Industrial Total: Removal Nitrogen Loading Rate (Ibs /ac /yr) Graph l: Iotal Nitrogen Export ft om Las Graph 2: Total Nitrogen Export from Right- of -N1'ac '0,0 j x T o.o 0 "o 10 ?0 20% 30?,; 40% 9% 60% -0oo Percentage of Right- of-Way that is Impersioes Post - Developed (after BMP reductions) Nitrogen Export Summary Table - i Sttttrber of Lots per Acre 16005 SW Ex. Summary Page 2 of 6 9/19/12 Permanently 0.6 Protected Undisturbed Open Space Permanently 1.2 Protected Managed Open Space Lots (use Graph 1) Right -of- Way (use Graph 2) Total: Nitrogen Loading Rate (Ibs /ac /yr) 5000 90oo 100% TN export from site (Total TN -TN Removal) Type of Land Area TN Export BMP ' TN Cover Coefficient TN Removal (acres) (Ibs /ac /yr) Removal from Rate Use ��-- (Ibs /yr) - i Sttttrber of Lots per Acre 16005 SW Ex. Summary Page 2 of 6 9/19/12 Permanently 0.6 Protected Undisturbed Open Space Permanently 1.2 Protected Managed Open Space Lots (use Graph 1) Right -of- Way (use Graph 2) Total: Nitrogen Loading Rate (Ibs /ac /yr) 5000 90oo 100% TN export from site (Total TN -TN Removal) OK'THE Town OF Holly Stormwater Design Executive Summary Springs TOWN OF HOLLY SPRINGS ENGINEERING DEPARTMENT NORTH CAROLINA Method 2 (Sites with Known Impervious) Existing Residential bg 7.5 S� Existing Cropland — 13.6 Existing 13 _ Commercial /Industrial Total: t1-7.ZS zvS.4g Nitrogen Loading Rate (Ibs /ac /yr) 2 j o Post - Developed (after BMP reductions) Nitrogen Export Summary Table Type of Land Pre - Developed TN Export Nitrogen Export Summary Table TN Type of Land Cover Area TN Export TN TN Coefficient Ex &.rt frcW16 Total Suspended Solids (TSS) Removal (acres) (Ibs /ac /yr) Us Summary Removal from (Ibs /yr) Existing Forestiand 104 , e y 1.7 Existing Pasture — 44 — Existing Residential bg 7.5 S� Existing Cropland — 13.6 Existing 13 _ Commercial /Industrial Total: t1-7.ZS zvS.4g Nitrogen Loading Rate (Ibs /ac /yr) 2 j o Post - Developed (after BMP reductions) Nitrogen Export Summary Table Type of Land Area TN Export BMP TN TN Cover Coefficient TN Removal export (acres) (Ibs /ac /yr) Removal from from site Rate Use (Total ( %) (Ibs /yr) TN -TN Removal) Permanently 0.6 Protected b.OV3 LS x{.110 Undisturbed Open Space Permanently 1.2 Protected H� �p ZS 400.53 Managed Open Space Impervious b4.1o3 21.2 ZS ►340.oiS Total: 1 t Z.tiS Nitrogen Loading Rate (Ibs /ac /yr) i2. tog tH23•o4 16005 SW Ex. Summary Page 3 of 6 9/19/12 4KTHE TOWN OF houy Stormwater Design Executive Summary Springs TOWN OF HOLLY SPRINGS ENGINEERING DEPARTMENT N O R T H C A R O L I N A Provide brief description of how 85% TSS removal is being achieved: V ERSE QEFC-.- TV -V"E COr+p0S-j*.-cS TSS CAt,GALA-r:r00S. 16005 SW Ex. Summary Page 4 of 6 9/19/12 THE TOWN OF Holly Stormwater Design Executive Summary jPn Springs TOWN OF HOLLY SPRINGS ENGINEERING DEPARTMENT N O R T H C A R O L I N A D. Storm Drainage Conveyance Summary SCZ STov*� V,6POV:( Design engineer shall complete the tables below (or attach tables containing the Rainfall Drainage identical information and layout) for each storm drainage system analyzed. If site Total Inv.Out Rim HGL Freeboard conditions require analysis beyond 25 -year rainfall event (such as an arterial crossing), then designer shall include additional tables as needed. Flow Structure Summary (10 Year Event) (Town Structure Structure Rational Rainfall Drainage Surface Total Inv.Out Rim HGL HGL ID Type 'C' Intensity Area Flow Flow In (Town 'ifo' In Out Pipe? Standard (in /hr) (acres) (cfs) (cfs) (feet) (feet) (feet) (Yes /No) Structure Summary (25 Year Event) Structure Structure Rational Rainfall Drainage Surface Total Inv.Out Rim HGL Freeboard ID Type 'C' Intensity Area Flow Flow To Rim (Town 125' In Out Standard #) (in /hr) (acres) (cfs) (cfs) (feet) (feet) (feet) (feet) Storm Drainage Piping Summary U.S. D.S. Pipe Pipe Slope Vel Q1 Q Qot Pipe U.S. D.S. HGL vp Structure Structure Length Diam. ocit 0 2 her Capa Inv. Inv. HGLvp (14 ID ID (feet) (inches) (ft/ft) y cfs) 5 (cfs) city (fee) (feet) (feet) (feet) 9 Tc, I, cf a S) 16005 SW Ex. Summary Page 5 of 6 9/19/12 THE TOWN OF AKt Ol)y Stormwater Design Executive Summary Springs TOWN OF HOLLY SPRINGS ENGINEERING DEPARTMENT N O R T H C A R O L I N A E. Individual BMP Summary CD U 22 o � o 0 c m .n O c N mQ U o va (acres) (Y / N) (Y / N) (cubic ft) Include additional BMP information if appropriate: 16005 SW Ex. Summary Page 6 of 6 9/19/12 Infiltration 0'F- L k l N p C O "a 6 O E ; f6 o c U a3 m o m wa a) o� E° ) O `o 2 o Q- °) o! Q a)< a° EQZ 5- 2 a` Z a �— CL > (acres) (Y / N) (Y / N) (cubic ft) Include additional BMP information if appropriate: 16005 SW Ex. Summary Page 6 of 6 9/19/12 Infiltration (Y /N) (Y /N) N p CD aa)) > "a 6 O a) a M o _cEZ wa a) o� 06 Ha} O (Y /N) (Y /N) THE TOWN OF Town Of Holly Springs My Engineering Department Springs Stormwater Fee -In -Lieu Request Form NORTH CAROLINA If applicable, please print this form, fill in requested information, sign and date and submit it as a draft with your Preliminary Stormwater Management Report. An updated version of the form will need to be submitted with the final stormwater management report. Contact Information Business Name: Contact Person: Street Address: City, State, Zip: Telephone Number Fax number: Email address: Project Information Applicant (FRP) ILV,O NIEti+ "SLR. TLAGfi l_LC. Dgvz+� {�Q,U12CoF, 30 S. ME'IJSP.N "Zr su-t: t1r I __?'N93AN 4k4O LZS T_t,) 4 b %.bbl c�l�i �t3- 5t,•it� fIGiCQta` ( Y34t CtoMuj.c'_0m Applicant Agent M C. AID OdAcl \OSH AL. 'F•W 'P V. CV0 7ciOS M =VTArQ PY 4 b1AVtVsck%A, NC- 7.1-4 1S (ol t 0�) 3t. t - s000 ( °1110 SW - 77-1.1\ ;oAk c f? M c o dnlmc r0 • C Dry -, Project Name: Nowt SPQJ_N6S. -ro"NS Cr- ,A-aEe_ - PRA E'- TOHS Project Number: t3 - o'? -r?Y') Project Location: M(_ Hwy sS o,,t,d tvi�N 1AT-LL YC>,Al> PIN Number: O b 4 (t - s-4 - 619R S River Basin: F-I Neuse FM Cape Fear Nutrient Removal Information IM Total Site Area 0 Acres Existing Impervious Area Sq. ft. Proposed Impervious Area ?. SIIS. 2$3 sq• ft. n Pre - Development Nitrogen Load lbs. /ac /yr. Post - Development Nitrogen Load : D. b } lbs. /ac /yr. Nitrogen removed by BMP(s) 3.3$ lbs. /ac /yr. Total Nitrogen = Post - Development Nitrogen Load - Nitrogen removed by BMP(s) 'j , Z 1 lbs. /ac /yr. ® Fee Amount to be paid to the TORS Note: Fee in -lieu must be paid prior to issuance of Env. Dev. $ Permit from the Engineering Department (xj Supporting calculations for determining fee amount n Maintenance Agreement -VKSS feF. 2= cy OFF Fi FFE NOTE: lbs. nitrogen /acre /year - Total Nitrogen ygtEV;4�7JSW( PPi'11 _M PttASC t - Neuse River Basin: Total fee -in -lieu = Number of pounds /acre /year to be offset x Acres in Development x 30 years x 23- 325 -53 $18.49 per pound. $ _ _ lbs. nitrogen/acre /year x _ acres x 30 years x $18.49/lb. Cape Fear River Basin: Total fee -in -lieu = Number of pounds /acre /year to be offset x Acres in Impervious Surface x 30 years 23- 325 -53 x $14.00 per pound. $ 113 °I%pS . 05 =3.0 lbs. nitrogen/acre /year x %12, acres x 30 years x $14.00/lb. Office Use Only ❑ Preliminary E3 Approved S at Construction El Payment Initials Date Initials Date Initials Date TN OT -Fst✓T FE6 P"V 'ro-40y 16006 SW Fee -in -lieu Request Page 1 of 1 Im-Y-47 i m 1% lib , (,,W) . L4 11/24/10 REt��=c�►u►v BA�r+t`►GE TM TOWN OF dolly Stormwater Submittal Checklist Springs TOWN OF HOLLY SPRINGS ENGINEERING DEPARTMENT NORTH CAROLINA Project Information Project Name: I aao��� _Sjrri,-,Sc Project Applicant: Property Owner: oe'- w; x Y U z Submittal Items Y (Detailed description of submittal items is available in section 8.04 of the Design Manual.) U v m Q O ■ `I ■ `1 ■'1 ■ ■ ■ ■ ■ iTi ■ ■ ■ 1� ■ ■ LT ■ r� ■ c� ■ EI ■ ■R ■ _I ■ RI ■ �1 Stormwater Infrastructure Plan(s): Applicable Sheet(s) in the Construction Drawing Set Stormwater Management Report (Submit 2 copies) Proiect Narrative Existing & Proposed Drainage Area Maps Stormwater Design Executive Summary — Appendix C Sizing Calculations & Applicable DWQ excel sheets — Document located at http://h2o.enr.state.nc.us/su/bmp—forms,htm First Flush Volume Calculations Stormwater BMP Routing Calculations Anti - flotation Calculations Nitrogen Export Calculations TSS Removal Calculations Storm Drainage Design Calculations Erosion Control Calculations Soils Information Outlet Protection Calculations Erosion Control Calculations Stormwater Fee -in -lieu request form /Total Nitrogen Fee -In -Lieu Flood Study (Submit 2 copies of ALL items, including digital files) Flood Study Narrative Flood Study Schematic Hydrologic calculations for sub- basins & hydraulic analysis Digital Model: (HEC -RAS or HEC -HMS) Drainage Basin Map Approved Land Use Map (8 1/2" x 11 ") CAD file (dwg format): including floodnlain, cross section, 100 year water surface elevation and adjacent FFE Existing Impoundments Documentation (on or offsite) 401/404 Permits, Final PCN & Supporting Documentation Preliminary Operations & Maintenance Agreement — Appendix D Preliminary Performance Surety PE Construction Estimates Preliminary Covenants PE Certifications BMP Educational Signage Homeowners Education Packet * If items included on this submittal checklist have not been received with each submittal, plans will be rejected and will not be able to return until the next review cycle when all submittal requirements have been provided for review. 16003 SW Submittal Checklist Page 1 THE, TOWN OF Holly AO Sprrings ings Stormwater BMP Summary NORTH CAROLINA TOWN OF HOLLY SPRINGS ENGINEERING DEPARTMENT Project Information Project Name: n��� S�n, .ss -& "� ca„r, - P%ce_ TOHS Project Number: L3 _ t - OR Project Location: Or_ *kn 5'S ,.,J 0--a to�1 � PIN Number: 041(9 - 5-) - A?B.R Identify the types of Best Management Practices in the project, location and give a brief description of their design, if you need additional space please attach separate sheet to this document. Please attach an 8 Y2" x 11" site plan showing the general location of each BMP you identify in the table. This summary & map shall be included with the O &M Agreement, Bonding Application and Annual O &M Certifications. BMP Type Quantity Location & Brief Description of 150% Total 35% Total in Project Each BMP Dry Extended Detention Basins Dry Extended Detention Basin with Infiltration Level Spreaders Wet Detention Basin 2 Infiltration Level Spreaders Infiltration Trench Dry Wells Bioretention Areas Permeable Pavement Manufactured Products Grassed Swales Stormwater Wetlands Vegetated Filter Strip / Restored Riparian Buffer TOTALS 16012 4/24/12 Page 1 of 1 (Performance (Maintenance Surety Surety) PWA o =oF w.a rrf;,, ob —_ --< "DENR STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WETLAND SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part Ill) must be printed, filled out and submitted along with all the required information. I. PROJECT INFORMATION Project name Contact name Phone number Date Drainage area number Ill. DESIGN INFORMATION Site Characteristics Drainage area Impervious area Percent impervious Design rainfall depth Peak Flow Calculations 1 -yr, 24 -hr rainfall depth 1 -yr, 24 -hr intensity Pr-- development 1 -yr, 24 -hr runoff I velopment 1 -yr, 24 -hr runoff Pre, ,st 1 -yr, 24 -hr peak control Storage Volume: Non -SA Waters Minimum required volume Volume provided (temporary pool volume) Storage Volume: SA Waters Parameters 1.5" runoff volume Pre - development 1 -yr, 24 -hr runoff volume Post - development 1 -yr, 24 -hr runoff volume Minimum volume required Volume provided Outlet Design Depth of temporary pool /ponding depth (DP,a,ts) Drawdown time Diameter of orifice Coefficient of discharge (CD) used in orifice diameter calculation Driving head (Ho) used in the orifice diameter calculation Form SW401- Wetland- Rev. 6- 11/16/09 N+*I&Rloga� Ra tt 4 S� `,r $s -r'0� WV Ga4tr- — Qu►. u L � - 'gwsvh A11an . 919 - 361 -5000 December 9, 2011 SWMF #4 (POA #2) 36a,t077 *+!L 2 arse -, Zoo,3? L 4+L 1.00 inch 2.89 in not applicable in /hr 0 ft3 /sec 7.69 e-FS ft3 /sec..�'.t (� • I �.S 1 an ft3 /sec t .S+s c�rs -49,464 -G0 ft3 1tft *531 43 20,459.00 ft3 OK W ft3 ft 3 ft3 ft 3 49-994 OK x _1 -53 -days 1.04 OK 2.50 in �'" OK 0.60 (unitless) - 939�ft 0,91 Provide calculations to support this driving head. Parts I and II. Project Design Summary, Page 1 of 3 Surface Areas of Wetland Zones Surface Area of Entire Wetland )w Land shallow land percentage is: Shallow Water The shallow water percentage is: Deep Pool Forebay portion of deep pool (pretreatment) The forebay surface area percentage is: Non - forebay portion of deep pool The non- forebay deep pool surface area percentage is: Total of wetland zone areas Add or subtract the following area from the zones Topographic Zone Elevations Temporary Pool Elevation (TPE) Shallow Land (top) Permanent Pool Elevation (PPE) Shallow Water /Deep Pool (top) Shallow Water bottom Most shallow point of deep pool's bottom Deepest point of deep pool's bottom Design must meet one of the following two options: This design meets Option #1, Top of PPE is within 6" of SHWT, If yes: SHWT (Seasonally High Water Table) This design meets Option #2, "and has liner with permeability < 0.01 in /hr, If yes: �pth of topsoil above impermeable liner Topographic Zone Depths Temporary Pool Shallow Land Permanent Pool Shallow Water Deep Pool (shallowest) Deep Pool (deepest) Planting Plan Are cattails included in the planting plan? Number of Plants recommended in Shallow Water Area: Herbaceous Wcubic -inch container) Number of Plants recommended in Shallow Land Area: Herbaceous Wcubic -inch container), OR Shrubs (1 gallon or larger), OR Trees (3 gallon or larger) and Herbaceous (4+ cubic -inch) Number of Plants provided in Shallow Water Area: Herbaceous (4'cubic -inch container) Number of Plants provided in Shallow Land Area: Herbaceous Wcubic -inch container) Shrubs (1 gallon or larger) Trees (3 gallon or larger) and Grass -like Herbaceous (4+ cubic -inch) 20,459.00 ft2 OK 8,064.00 ft2 OK 39% % 8,393.00 ft2 OK 41%% 2,024.00 ft2 Insufficient forebay area. 10% % 1,978.00 ft2 OK 10% % 20,459.00 ft2 OK 0.00 ft2 361.00 ft amsl 360.00 ft amsl 359.50 ft amsl 358.50 ft amsl 357.00 ft amsl N (Y or N) ft amsl OK N (Y or N) in 12.00 in OK 6.00 in OK 18.00 in OK 36.00 in OK N (Y or N) OK 2,100 2,050 328 41 and 1,640 2,098 Higher density is required. 1,994 More required if not planting shrubs or trees. Form SW401- Wetland- Rev.6- 11/16/09 Parts I and II. Project Design Summary, Page 2 of 3 Additional Information Can the design volume be contained? Y (Y or N) OK 17' - project drain to SA waters? If yes, N (Y or N) Excess volume must pass through filter. is the length of the vegetated filter? 0.00 ft Are udiculations for supporting the design volume provided in the Y (Y or N) OK application? Is BMP sized to handle all runoff from ultimate build -out? Y (Y or N) OK Is the BMP located in a recorded drainage easement with a Y (Y or N) OK recorded access easement to a public Right of Way (ROW)? The length to width ratio is: 2.52 :1 OK Approximate wetland length 282.00 ft Approximate wetland width 112.00 ft Approximate surface area using length and width provided 31,584.00 ft z This approx. surface area is within this number of square feet of the entire wetland surface area reported above: Will the wetland be stabilized within 14 days of construction? Y (Y or N) OK Form SW401- Wetland- Rev.6- 11/16/09 Parts I and II. Project Design Summary, Page 3 of 3 �A NCDENR Permit No. (to be provided by DWQ) O=OH W F A T STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information. 11. PROJECT INFORMATION Project name Contact person Phone number 919- 361 -5000 Date 1/29/2015 Drainage area number 3D -To SWMF 6 III. DESIGN INFORMATION Site Characteristics Drainage area 768,834 ft2 Impervious area, post - development 444,748 ft2 % impervious 57.85 % Design rainfall depth 1.0 in Storage Volume: Non -SA Waters Data not needed for calculation option #1, but OK if provided. Minimum volume required 36,560 ft3 Volume provided 229,372 ft3 Storage Volume: SA Waters 1.5" runoff volume ft3 Pre - development 1 -yr, 24 -hr runoff ft3 Post - development 1 -yr, 24 -hr runoff ft3 Minimum volume required ft3 Volume provided ft3 Peak Flow Calculations Is the pre /post control of the lyr 24hr storm peak flow required? 1 -yr, 24 -hr rainfall depth Rational C, pre - development Rational C, post - development Rainfall intensity: 1 -yr, 24 -hr storm Pre - development 1 -yr, 24 -hr peak flow Post - development 1 -yr, 24 -hr peak flow Pre /Post 1 -yr, 24 -hr peak flow control Elevations Temporary pool elevation Permanent pool elevation SHWT elevation (approx. at the perm. pool elevation) Top of 1Oft vegetated shelf elevation Bottom of 1 Oft vegetated shelf elevation Sediment cleanout, top elevation (bottom of pond) Sediment cleanout, bottom elevation Sediment storage provided Is there additional volume stored above the state - required temp. pool? Elevation of the top of the additional volume Holly Springs Towne Center - Phase 2 J. Allen, PE OK, volume provided is equal to or in excess of volume required. Y (Y or N) 2.9 in (unitless) (unitless) 4.84 in /hr OK 7.23 ft3 /sec 6.98 ft3 /sec -0.25 ft3 /sec 321.18 fmsl 320.00 fmsl fmsl 320.50 fmsl 319.50 fmsl Data not needed for calculation option #1, but OK if provided. 314.00 fmsl 313.00 fmsl Data not needed for calculation option #1, but OK if provided. 1.00 ft Y (Y or N) 321.2 fmsl OK Form SW401 -Wet Detention Basin- Rev.9- 4/18/12 Parts I. & II. Design Summary, Page 1 of 2 Permit No. 111. DESIGN INFORMATION Surface Areas (to be provided by D WQ) Area, temporary pool 30,983 fe Area REQUIRED, permanent pool 22,219 fl? SAIDA ratio 2.89 (unitless) Area PROVIDED, permanent pool, Ap---,—i 26,047 ff� OK Area, bottom of 1 Oft vegetated shelf, Abet s,dt 21,354 ft` Area, sediment cleanout, top elevation (bottom of pond), AW_,nd 10,784 fe Volumes Volume, temporary pool 229,372 ft' OK Volume, permanent pool, Vpen -pwi 98,942 ft3 Volume, forebay (sum of forebays if more than one forebay) 21,474 ft3 Forebay % of permanent pool volume 21.7% % OK SAIDA Table Data Design TSS removal 90 % Coastal SAIDA Table Used? N (Y or N) Mountain /Piedmont SAIDA Table Used? Y (Y or N) SAIDA ratio 2.89 (unitless) Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10 -2b) Y (Y or N) Volume, permanent pool, Vpenn _Poor 98,942 ft3 Area provided, permanent pool, Apemp-1 26,047 ft` Average depth calculated 3.80 ft OK Average depth used in SAIDA, de,,, (Round to nearest 0.5ft) 4.0 ft OK Calculation option 2 used? (See Figure 10 -2b) N (Y or N) Area provided, permanent pool, Ap. -pcd 26,047 ft` Area, bottom of 1Oft vegetated shelf, Abe, �he,f 21,354 ft` Area, sediment cleanout, top elevation (bottom of pond), Abot,o d 10,784 ft2 "Depth" (distance b/w bottom of 1Oft shelf and top of sediment) 5.50 ft Average depth calculated ft Average depth used in SAIDA, da., (Round to down to nearest 0.5ft) ft Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 3.00 in Area of orifice (if- non - circular) in' Coefficient of discharge (Co) 0.60 (unitless) Driving head (He) 0.50 It Drawdown through weir? N (Y or N) Weir type (unitless) Coefficient of discharge (CW) (unitless) Length of weir (L) ft Driving head (H) ft Pre - development 1 -yr, 24 -hr peak flow 7.23 ft3 /sec Post - development 1 -yr, 24 -hr peak flow 6.98 ft3 /sec Storage volume discharge rate (through discharge orifice or weir) 0.17 ft3 /sec Storage volume drawdown time 2.65 days OK, draws down in 2 -5 days. Additional Information Vegetated side slopes 3 :1 OK Vegetated shelf slope 10 :1 OK Vegetated shelf width 10.0 ft OK Length of flowpath to width ratio 3 :1 OK Length to width ratio 1.5 :1 OK Trash rack for overflow & orifice? Y (Y or N) OK Freeboard provided 1.0 ft OK Vegetated filter provided? N (Y or N) OK Recorded drainage easement provided? Y (Y or N) OK Capures all runoff at ultimate build -out? N (Y or N) Required to capture all runoff from the ultimate build -out Drain mechanism for maintenance or emergencies is: 8" DIP w/ valve Form SW401 -Wet Detention Basin- Rev.9- 4/18/12 Parts I. & II. Design Summary, Page 2 of 2 THE TOWN OF Molly Springs NORTH CAROLINA OE HOLLY SPR / /yCS Environmento' Services and Stormwater Management .� ANC' /VEERING DEPAV" TOWN OF HOLLY SPRINGS OPERATIONS AND MAINTENANCE AGREEMENT & MANUAL COVER SHEET HOLLY SPRINGS TOWNE CENTER - PHASE 2 Holly Springs, North Carolina Owner/Financially Responsible Party: KRG New Hill Place, LLC 30 S. Meridian St., Suite 100 Indianapolis, IN 46204 Registered Agent: Corporation Service Company 327 Hillsborough Street Raleigh, NC 27603 (888) 690 -2882 - Phone (302) 636 -5454 - Fax Prepared By: The John R. McAdams Co, Inc. PO Box 14005 RTP, NC 27709 Contact Name: David George 30 S. Meridian St., Suite 100 Indianapolis, IN 46204 (317) 713 -5646 - Office (317) 577 -7879 - Fax daeorae(a,kiterealty. com Design Engineer: Josh Allen, PE PO Box 14005 RTP, NC 27709 (919) 361 -5000 - Office (919) 361 -2269 - Fax ihnatolva(a�i ohnrmcadams. com Date Submitted by Design Engineer: Date of DRAFT Approval by Town of Holly Springs: Date of Approval by Town of Holly Springs: 16024 O &M Document 9.25.09 Page 1 of 7 Structural Stormwater Best Management Practice (BMP) Maintenance Agreement SWMF #4 (Stormwater Wetland) Note: Maintenance intervals of the various overall BMP components is listed below. See section I and II of the attached Operations and Maintenance Manual for detailed maintenance procedures associated with the items below. I. Monthly or after every runoff producing rainfall, whichever come first: a. Entire BMP b. Perimeter of Wetland c. Inlet & Outlet Device d. Planted Forebay & Wetland Zones e. Deep pool, shallow water, and shallow land areas f. Vegetated Shelf II. Quarterly a. Drainage Area of the wetland b. Receiving Water III. Semi - Annually a. Aquatic Environment b. Micropool IV. Annually a. Annual Inspection & Certification by Registered Professional Engineer to TOHS b. Quarterly Inspection Reports c. Inspection of Dam Embankment by Dam Safety Expert d. Sediment and Dredging I, , hereby acknowledge that I represent the financially responsible party for maintenance of the Structural Stormwater Best Management Practices for this site. I will perform the maintenance as outlined above for this project. Operation and maintenance responsibilities may be transferred to the HOA/OWNER upon completion, contingent upon the Town of Holly Springs approving that all installation, performance measures and documentation are in compliance with the approved stormwater management plan. Signature: Date: I, . a Notary Public of the State of , County of _ . do hereby certify that personally appeared before me this day of, and acknowledge due execution of the foregoing instrument. Witness my hand and official seal, Seal My Commission Expires: 16024 O &M Document Page 2 of 7 9.25.09 OPERATIONS & MAINTENANCE MANUAL Project Name & Phase: Holly Springs Towne Center - Phase 2 Information: The stormwater wetland (SWMF #4) will be constructed and maintained by KRG New Hill Place, LLC. Attn: David George. Phone (317) 713 -5646 Fax (317) 577 -7879 email dgeorge @kiterealty.com. The BMP(s) is /are located on property owned by KRG New Hill Place, LLC. Deed Book XXXX Page XXXX. A stormwater surety or another approved instrument will be provided in the amount equal to the replacement cost of the pond plus 50 %. Date Constructed: Location: Hollv Sminas Towne Center - Phase 2 (Adiacent to collector road Receiving Watercourse(s): Unnamed Tributary to Little Branch Contractor: (applicable structure) Example add impoundment & dam info. (applicable structure) Example add spillway info. (applicable structure) Example add spillway channel info. Material Supplies: Riser Structure 4'x 4' Square Concrete Outlet Barrel 24" O -ring RCP Riprap Velocity Dissipator NCDOT Class `B' Riprap 121 x 14'W x 22 " Thick 16024 O &M Document Page 3 of 7 9.25.09 Project Name & Phase: Holly Springs Towne Center - Phase 2 Type of BMP: Stormwater Wetland (SWMF #4) Type of BMP: This manual established procedures for maintenance and operation of the stormwater wetland (SWMF #4). I. MAINTENANCE Frequency: Inspection Frequency Inspection Type Quarterly and within 24 Inspection must be conducted by a trained, qualified party. These hours after every water inspections are intended to identify obvious maintenance needs quality storm (greater than early in order to prevent more extensive corrective actions. 1.0 inch) Annual Certification Inspection must be conducted by a Professional Engineer. These inspections are intended to provide a more thorough assessment of the facility. Annual inspection reports (sealed by the PE) must be submitted to the TOHS Engineering Department. Field survey calculations to confirm storage volume and embankment stabilization, etc. may be required on a case by case basis. Important Maintenance Procedures: - Immediately following construction of the stormwater wetland, bi- weekly inspections will be conducted and wetland plants will be watered bi- weekly until vegetation becomes established (commonly six weeks) - No portion of the stormwater wetland will be fertilized after the first initial fertilization (if required) to establish the wetland plants. - Stable ground cover will be maintained in the drainage area to reduce the sediment load to the wetland. - Once a year, a dam safety expert should inspect the embankment. Detailed Maintenance Procedures: BMP element Potential problem Entire BMP Trash/debris is present. Drainage area of the BMP Ground cover is unstable, or loose soil or is available for erosion Perimeter of the wetland Areas of bare soil and/or erosive gullies have formed Vegetation is too short or too long. Inlet device: pipe or swale The pipe is clogged. The pipe is cracked or otherwise damaged. 16024 O &M Document Page 4 of 7 9.25.09 How to remedy the problem Remove the trash/debris. Stabilize groundcover or remove loose soil or debris. Regrade the soil if necessary to remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one- time fertilizer application. Maintain vegetation at a height of approximately six inches. Unclog the pipe. Dispose of the sediment properly. Replace the pipe. Forebay Planted Forebay and Wetland Zones Deep pool, shallow water and shallow land areas Embankment 16024 O &M Document 9.25.09 Erosion is occurring in the swale Sediment has accumulated and reduced the design depth to 75% of the original design depth Erosion has occurred. A minimum coverage of 70% is not achieved in the planted zones after the second growing season. Weeds are present. Algal growth covers over 50% of the deep pool and shallow water areas. Cattails, phragmites or other invasive plants cover 15% to 20% of the deep pool and shallow water areas. Shallow land remains flooded more than 5 days after a storm event. Plants are dead, diseased or dying. Best professional practices show that pruning is needed to maintain optimal plant health. Sediment has accumulated and reduced the depth to 75% of the original design depth of the deep pools. Regrade the Swale if necessary to smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Supplemental planting should be completed. Coverage of 90% to 95% is desirable. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. Consult a professional to remove and control the algal growth. Remove the plants by wiping them with pesticide (do not spray) — consult a professional. Remove cattail Irons and dispose of offsite. Removal of root structure may be required. Unclog the outlet device immediately. Determine the source of the problem: soils, hydrology, disease, etc. Remedy the problem and replace plants. Provide a one -time fertilizer application to establish the ground cover if a soil test indicates it is necessary. Prune according to best professional practices. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Sediment needs to be carefully removed to minimize impacts to existing vegetation and promote the re- establishment of vegetation in disturbed areas. Shrubs have started to grow on the Remove shrubs immediately. embankment. Page 5 of 7 Evidence of muskrat activity is present. Tree(s) have started to embankment. Annual inspection by professional shows or beaver Use traps to remove muskrats and consult a professional to remove beavers. grow on the Consult a dam safety specialist to remove the tree. appropriate Make all needed repairs. that the embankment needs repair. Micropool Sediment has accumulated and Search for the source of the sediment reduced the depth to 75% of the and remedy the problem if possible. original design depth. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Plants are growing in the micropool. Remove the plants, preferably by hand. If a pesticide is used, wipe it on the plants rather than spraying. Outlet device Clogging has occurred. Clean out the outlet device and properly dispose sediment. The outlet device is damaged Repair or replace the outlet device. Receiving water Erosion or other signs of damage Contact the TOHS Engineering have occurred at the outlet. Department H. OPERATION A. Record Keeping The Town of Holly Springs shall be provided with written inspection reports as specified in this manual. These reports shall be provided annually within 30 days of the anniversary of receipt of the "Stormwater BMP /O &M Responsibility Transfer" letter (form 416037). A professional engineer shall certify the reports. The Town of Holly Springs Engineering Department shall be notified as soon as any deficiencies in the detention structure are recorded. The Town shall be notified of the proposed methods to bring the structure into conformance and furthermore, the Town shall approve of any proposed work to be completed on any part of the structure prior to any work being started. After work has been completed the Town shall inspect and approve of the work before it shall be considered complete. After the Town approves the work an as -built drawing shall be completed and provided to the Town. Note: Operation of a BMP should include the following: • Annual & Ouarterly Inspection Reports — a collection of a written inspection report should be kept on record, Inspection should be conducted at minimum quarterly and certified by a professional engineer annually. • Observations — all observations should be recorded. Where periodic inspections are performed following significant rainfall events, these inspections should be logged on the log forms found in Appendix D of the Town's Design Manual or created specifically for the project. • Maintenance — written records of maintenance and /or repairs should be recorded on the Operation & Maintenance Log Form found in Appendix D of the Town's Design Manual or created specifically for the project. • Other Operation Procedures — the owner should maintain a complete and up -to -date set of plans (as -built drawings) and all changes made to the dam over time should be recorded on the as- builts. Mylar and digital as- builts shall be provided to the Town each time they are updated. 16024 O &M Document Page 6 of 7 9.25.09 Ouarterly Operation and Maintenance Loizs - will be kept on file by the Owner or Responsible Party for each Structural BMP. Forms to be used to create Inspection and Maintenance Logs for each BMP are provided in the Appendix to this BMP Manual. • Annual inspection and maintenance certifications - must be filed with the TORS. A digital photograph must be taken at the time of inspection and after maintenance for each BMP. These must be kept on file, with a hard copy fled in the Inspection and Maintenance Log. There are various training, qualification and certification programs for available for BMP inspectors, it is recommended that all parties filling out quarterly operation and maintenance logs to be trained appropriately for each BMP inspected. B. Sedimentation & Dredging Sedimentation from establishing areas tributary to the BMP may eventually result in the reduction of the storage volume and eventually will have to be removed. The frequency of this sediment removal can be reduced by ensuring that the site areas around the building be stabilized with a vegetative ground cover such that it restrains erosion. This would include a periodic application of fertilizer and other treatments necessary to promote a stable groundcover and minimize sedimentation to the BMP. The maintenance on this BMP requires that the micropool and forebay all be cleaned out when the accumulated sediment depth equals 1 -foot (elevation 356.00 in forebay and elevation 357.00 in micropool). Any sediment accumulation within the wetland interior should be promptly removed to restore design depths. For aesthetic purposes it may be desirable to maintain it prior to this point. The removed material should be hauled offsite to a suitable landfill site or mounded somewhere on site and stabilized with a groundcover sufficient to restrain erosion. III. INSPECTION, OPERATION & MAINTENANCE LOGS (attach a blank copy of the applicable O&M log for each BMP) (attach 8 %x 11 Location Map) (attach 8 % x 11 copy of Recorded Plat(s)) (attach the Stormwater Management Plan, including form 916012 and As- builts) (attach Engineer Certifications for construction of each BMP) 16024 O &M Document Page 7 of 7 9.25.09 AMAA NCDENR Permit No. (to be provided by DWQ) O�pF W A TF9QG STORMWATER MANAGEMENT PERMIT APPLICATION FORM 401 CERTIFICATION APPLICATION FORM WET DETENTION BASIN SUPPLEMENT This form must be filled out, printed and submitted. The Required Items Checklist (Part 111) must be printed, filled out and submitted along with all of the required information. 11. PROJECT INFORMATION Project name Contact person Phone number 919 - 361 -5000 Date 11/28/2014 Drainage area number 3C -To SWMF 5 III. DESIGN INFORMATION Site Characteristics Drainage area 914,324 fe Impervious area, post - development 441,542 fe % impervious 48.29 % Design rainfall depth 1.0 in Storage Volume: Non -SA Waters Data not needed for calculation option #1, but OK if provided. Minimum volume required 36,996 ft3 Volume provided 264,921 ft3 Storage Volume: SA Waters 1.5" runoff volume ft3 Pre - development 1 -yr, 24 -hr runoff ft3 Post - development 1 -yr, 24 -hr runoff ft3 Minimum volume required ft3 Volume provided ft3 Peak Flow Calculations Is the pre /post control of the lyr 24hr storm peak flow required? 1 -yr, 24 -hr rainfall depth Rational C, pre - development Rational C, post - development Rainfall intensity: 1 -yr, 24 -hr storm Pre - development 1 -yr, 24 -hr peak flow Post - development 1 -yr, 24 -hr peak flow Pre /Post 1 -yr, 24 -hr peak flow control Elevations Temporary pool elevation Permanent pool elevation SHWT elevation (approx. at the perm. pool elevation) Top of 1Oft vegetated shelf elevation Bottom of 1 Oft vegetated shelf elevation Sediment cleanout, top elevation (bottom of pond) Sediment cleanout, bottom elevation Sediment storage provided Is there additional volume stored above the state - required temp. pool? Elevation of the top of the additional volume Holly Springs Towne Center - Phase 2 J. Allen, PE OK, volume provided is equal to or in excess of volume required. Y (Y or N) 2.9 in (unitless) (unitless) 4.84 in /hr OK 7.23 f3 /sec 6.97 ft3 /sec -0.26 ft'/sec 327.85 fmsl 326.50 fmsl fmsl 327.00 fmsl 326.00 fmsl Data not needed for calculation option #1, but OK if provided. 319.00 fmsl 318.00 fmsl Data not needed for calculation option #1, but OK if provided. 1.00 ft Y (Y or N) 327.9 fmsl OK Form SW401 -Wet Detention Basin- Rev.9- 4/18/12 Parts I. & II. Design Summary, Page 1 of 2 Permit No. III. DESIGN INFORMATION Surface Areas (to be provided by DWQ) Area, temporary pool 29,054 ftz Area REQUIRED, permanent pool 19,567 ft SAIDA ratio 2.14 (unitless) Area PROVIDED, permanent pool, Apen-pool 22,405 ft' OK Area, bottom of 1Oft vegetated shelf, Abot a,dr 18,595 fl? Area, sediment cleanout, top elevation (bottom of pond), Abot_Pond 6,522 ftz Volumes Volume, temporary pool 264,921 ft3 OK Volume, permanent pool, Vpenn-P-, 104,910 ft3 Volume, forebay (sum of forebays if more than one forebay) 22,247 ft3 Forebay % of permanent pool volume 21.2% % OK SA/DA Table Data Design TSS removal 90 Coastal SAIDA Table Used? N (Y or N) Mountain /Piedmont SAIDA Table Used? Y (Y or N) SAIDA ratio 214 (unitless) Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10 -2b) Y (Y or N) Volume, permanent pool, Vp,,n_p.i 104,910 ft3 Area provided, permanent pool, Apen-poot 22,405 It' Average depth calculated 4.68 ft OK Average depth used in SAIDA, day, (Round to nearest 0.5ft) 4.5 It OK Calculation option 2 used? (See Figure 10 -2b) N (Y or N) Area provided, permanent pool, AP.-Pool 22,405 ff Area, bottom of 1Oft vegetated shelf, Abo, sheet 18,595 ff Area, sediment cleanout, top elevation (bottom of pond), Abot_ pond 6,522 ftz 'Depth" (distance b/w bottom of 1 Oft shelf and top of sediment) 7.00 ft Average depth calculated It Average depth used in SAIDA, da,, (Round to down to nearest 0.51t) ft Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 3.00 in Area of orifice (if- non - circular) in Coefficient of discharge (Co) 0.60 (unitless) Driving head (Ho) 0.61 ft Drawdown through weir? N (Y or N) Weir type (unitless) Coefficient of discharge (C,H) ( unitless) Length of weir (L) It Driving head (H) ft Pre - development 1 -yr, 24 -hr peak flow 7.23 ft3 /sec Post - development 1 -yr, 24 -hr peak flow 6.97 ft3 /sec Storage volume discharge rate (through discharge orifice or weir) 0.19 ft3 /sec Storage volume drawdown time 2.39 days OK, draws down in 2 -5 days. Additional Information Vegetated side slopes 3 :1 OK Vegetated shelf slope 10 :1 OK Vegetated shelf width 10.0 ft OK Length of flowpath to width ratio 3 :1 OK Length to width ratio 1.5 :1 OK Trash rack for overflow & orifice? Y (Y or N) OK Freeboard provided 1.4 ft OK Vegetated filter provided? N (Y or N) OK Recorded drainage easement provided? Y (Y or N) OK Capures all runoff at ultimate build -out? N (Y or N) Required to capture all runoff from the ultimate build -out Drain mechanism for maintenance or emergencies is: 8" DIP w/ valve Form SW401 -Wet Detention Basin- Rev.9- 4/18/12 Parts I. & II. Design Summary, Page 2 of 2 THE TOWN OF 1Io11y Springs NORTH C A R o L t N A TOWN OF HOLLY SPRINGS NpFHOLLYSpRzwC� OPERATIONS AND MAINTENANCE Environmental Services and StormwaTer AGREEMENT & MANUAL COVER SHEET Management �ryG�NEERMG DEPPRtMEa� HOLLY SPRINGS TOWNE CENTER - PHASE 2 Holly Springs, North Carolina Owner/Financially Responsible Party: Contact Name: KRG New Hill Place, LLC David George 30 S. Meridian St., Suite 100 30 S. Meridian St., Suite 100 Indianapolis, IN 46204 Indianapolis, IN 46204 (317) 713 -5646 - Office (317) 577 -7879 - Fax daeorae(&,kiterealtv.com Registered Agent: Corporation Service Company 327 Hillsborough Street Raleigh, NC 27603 (888) 690 -2882 - Phone (302) 636 -5454 - Fax Prepared By: Design Engineer: The John R. McAdams Co, Inc. Josh Allen, PE PO Box 14005 PO Box 14005 RTP, NC 27709 RTP, NC 27709 (919) 361 -5000 - Office (919) 361 -2269 - Fax i allen(i6 ohnrmcadams.com Date Submitted by Design Engineer: Date of DRAFT Approval by Town of Holly Springs: Date of Approval by Town of Holly Springs: 16024 O &M Document Page 1 of 7 9.25.09 Structural Stormwater Best Management Practice (BMP) Maintenance Agreement SWMF #S (Wet Pond) Note: Maintenance intervals of the various overall BMP components is listed below. See section I and II of the attached Operations and Maintenance Manual for detailed maintenance procedures associated with the items below. I. Monthly or after every runoff producing rainfall, whichever come first: a. Entire BMP b. Perimeter of Wet Detention Basin c. Inlet & Outlet Device d. Forebay e. Vegetated Shelf II. Quarterly a. Drainage Area of the Wet Detention Basin b. Main Treatment Area c. Receiving Water III. Semi - Annually a. Aquatic Environment IV. Annually a. Annual Inspection & Certification by Registered Professional Engineer to TOHS b. Quarterly Inspection Reports c. Inspection of Dam Embankment by Dam Safety Expert d. Sediment and Dredging I, , hereby acknowledge that I represent the financially responsible party for maintenance of the Structural Stormwater Best Management Practices for this site. I will perform the maintenance as outlined above for this project. Operation and maintenance responsibilities may be transferred to the HOA/OWNER upon completion, contingent upon the Town of Holly Springs approving that all installation, performance measures and documentation are in compliance with the approved stormwater management plan. Signature: Date: I, , a Notary Public of the State of , County of do hereby certify that personally appeared before me this day of, and acknowledge due execution of the foregoing instrument. Witness my hand and official seal, Seal My Commission Expires: 16024 O &M Document Page 2 of 7 9.25.09 OPERATIONS & MAINTENANCE MANUAL Project Name & Phase: Holly Springs Towne Center - Phase 2 Information: The wet pond (SWMF #5) will be constructed and maintained by KRG New Hill Place, LLC. Attn: David George. Phone (317) 713 -5646 Fax (317) 577 -7879 email daeorae(a,kiterealtv.com. The BMP(s) is /are located on property owned by KRG New Hill Place, LLC. Deed Book XXXX Page XXXX. A stormwater surety or another approved instrument will be provided in the amount equal to the replacement cost of the pond plus 50 %. Date Constructed: Location: Holly Springs Towne Center - Phase 2 Receiving Watercourse(s): Unnamed Tributary to Little Branch Contractor: (applicable structure) Example add impoundment & dam info. (applicable structure) Example add spillway info. (applicable structure) Example add spillway channel info. Material Supplies: Riser Structure 4'x 4' Square Concrete Outlet Barrel 24 " O -ring RCP Riprap Velocity Dissipator NCDOT Class `B' Riprap 121 x 6'W x 22" Thick 16024 O &M Document Page 3 of 7 9.25.09 Project Name & Phase: Holly Springs Towne Center - Phase 2 Type of BMP: Wet Pond (SWMF #5) Type of BMP: This manual established procedures for maintenance and operation of the wet pond (SWMF #5). I. MAINTENANCE Frequency: Inspection Frequency Quarterly and within 24 hours after every water quality storm (greater than 1.0 inch) Annual Certification Important Maintenance Procedures: Inspection Type I Inspection must be conducted by a trained, qualified party. These inspections are intended to identify obvious maintenance needs early in order to prevent more extensive corrective actions. Inspection must be conducted by a Professional Engineer. These inspections are intended to provide a more thorough assessment of the facility. Annual inspection reports (sealed by the PE) must be submitted to the TOHS Engineering Department. Field survey calculations to confirm storage volume and embankment stabilization, etc. may be required on a case by case basis. - Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks) - No portion of the wet detention pond should be fertilized after the first initial fertilization (if required) to establish the plants on the vegetated shelf. - Stable ground cover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. - If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. - Once a year, a dam safety expert should inspect the embankment Detailed Maintenance Procedures: BMP element Entire BMP Drainage area of the BMP Perimeter of the wet detention basin Inlet device: pipe or Swale Potential problem Trash/debris is present. Ground cover is unstable, or loose soil or is available for erosion Areas of bare soil and /or erosive gullies have formed Vegetation is too short or too long The pipe is clogged. The pipe is cracked or otherwise damaged. 16024 O &M Document Page 4 of 7 9.25.09 How to remedy the problem Remove the trash/debris. Stabilize groundcover or remove loose soil or debris. Regrade the soil if necessary to remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one- time fertilizer application: Maintain vegetation at a height of approximately six inches. Unclog the pipe. Dispose of the sediment properly. Replace the pipe. Forebay Vegetated shelf Aquatic environment Main treatment area Embankment Outlet device Receiving water 16024 O &M Document 9.25.09 Erosion is occurring in the swale. Sediment has accumulated to a depth greater than the original design depth for sediment storage. Erosion has occurred. Weeds are present. Refer to vegetation maintenance table. Water quality monitoring indicates that parameters such as water clarity, algal growth, and others are outside of acceptable levels. Sediment has accumulated to a depth greater than the original design sediment storage depth. Algal growth covers over 50% of the area. Cattails, phragmites or other invasive plants cover 50% of the basin surface. Shrubs have started to grow on the embankment. Evidence of muskrat or beaver activity is present. Tree(s) have started to grow on the embankment. Annual inspection by appropriate professional shows that the embankment needs repair. Clogging has occurred. The outlet device is damaged Erosion or other signs of damage have occurred at the outlet. Page 5 of 7 Regrade the swale if necessary to smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Remove the weeds, preferably by hand. If pesticide is used, wipe it on the plants rather than spraying. Identify the source of the problem and correct it. Conduct follow -up monitoring to ensure that the parameters have resumed acceptable levels. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Consult a professional to remove and control the algal growth. Remove the plants by wiping them with pesticide (do not spray). Remove shrubs immediately. Use traps to remove muskrats and consult a professional to remove beavers. Consult a dam safety specialist to remove the tree. Make all needed repairs. Clean out the outlet device and properly dispose sediment. Repair or replace the outlet device. Contact the TOHS Engineering Department II. OPERATION A. Record Keeping The Town of Holly Springs shall be provided with written inspection reports as specified in this manual. These reports shall be provided annually within 30 days of the anniversary of receipt of the "Stormwater BMP /O &M Responsibility Transfer" letter (form #16037). A professional engineer shall certify the reports. The Town of Holly Springs Engineering Department shall be notified as soon as any deficiencies in the detention structure are recorded. The Town shall be notified of the proposed methods to bring the structure into conformance and furthermore, the Town shall approve of any proposed work to be completed on any part of the structure prior to any work being started. After work has been completed the Town shall inspect and approve of the work before it shall be considered complete. After the Town approves the work an as -built drawing shall be completed and provided to the Town. Note: Operation of a BMP should include the following: • Annual & Ouarteriv Inspection Reports — a collection of a written inspection report should be kept on record, Inspection should be conducted at minimum quarterly and certified by a professional engineer annually. • Observations — all observations should be recorded. Where periodic inspections are performed following significant rainfall events, these inspections should be logged on the log forms found in Appendix D of the Town's Design Manual or created specifically for the project. • Maintenance — written records of maintenance and /or repairs should be recorded on the Operation & Maintenance Log Form found in Appendix D of the Town's Design Manual or created specifically for the project. • Other Operation Procedures — the owner should maintain a complete and up -to -date set of plans (as -built drawings) and all changes made to the dam over time should be recorded on the as- builts. Mylar and digital as- builts shall be provided to the Town each time they are updated. • Ouarterly Operation and Maintenance Loas - will be kept on file by the Owner or Responsible Party for each Structural BMP. Forms to be used to create Inspection and Maintenance Logs for each BMP are provided in the Appendix to this BMP Manual. • Annual inspection and maintenance certifications - must be filed with the TOHS. A digital photograph must be taken at the time of inspection and after maintenance for each BMP. These must be kept on file, with a hard copy filed in the Inspection and Maintenance Log. There are various training, qualification and certification programs for available for BMP inspectors, it is recommended that all parties filling out quarterly operation and maintenance logs to be trained appropriately for each BMP inspected. B. Sedimentation & Dredging Sedimentation from establishing areas tributary to the BMP may eventually result in the reduction of the storage volume and eventually will have to be removed. The frequency of this sediment removal can be reduced by ensuring that the site areas around the building be stabilized with a vegetative ground cover such that it restrains erosion. This would include a periodic application of fertilizer and other treatments necessary to promote a stable groundcover and minimize sedimentation to the BMP. The maintenance on this BMP requires that the main pool and forebay both be cleaned out when the accumulated sediment depth equals 1 -foot (elevation 321.00 in forebay and elevation 320.00 in main pool). For aesthetic purposes it may be desirable to maintain it prior to this point. The removed material should be hauled offsite to a suitable landfill site or mounded somewhere on site and stabilized with a groundcover sufficient to restrain erosion. 16024 O &M Document Page 6 of 7 9.25.09 III. INSPECTION, OPERATION & MAINTENANCE LOGS (attach a blank copy of the applicable O &M log for each BMP) (attach 8 % x 11 Location Map) (attach 8 '/_� x 11 copy of Recorded Plat(s)) (attach the Stormwater Management Plan, including form #16012 and As- builts) (attach Engineer Certifications for construction of each BMP) 16024 O &M Document Page 7 of 7 9.25.09 THE TOWN OF Dolly Springs NORTH CAROLINA TOWN OF HOLLY SPRINGS JAN OF HOLLY SpRIIN OPERATIONS AND MAINTENANCE �O Emuonmental Gs Services and AGREEMENT & MANUAL COVER SHEET Sformwater Management 1 F�CNFFRING DEPPRSM�� HOLLY SPRINGS TOWNE CENTER - PHASE 2 Holly Springs, North Carolina Owner/Financially Responsible Party: Contact Name: KRG New Hill Place, LLC David George 30 S. Meridian St., Suite 100 30 S. Meridian St., Suite 100 Indianapolis, IN 46204 Indianapolis, IN 46204 (317) 713 -5646 - Office (317) 577 -7879 - Fax d2eorv-e(a,kiterealty. corn Registered Agent: Corporation Service Company 327 Hillsborough Street Raleigh, NC 27603 (888) 690 -2882 - Phone (302) 636 -5454 - Fax Prepared By: Design Engineer: The John R. McAdams Co, Inc. Josh Allen, PE PO Box 14005 PO Box 14005 RTP, NC 27709 RTP, NC 27709 (919) 361 -5000 - Office (919) 361 -2269 - Fax i allen(c,i ohnrmcadams.com Date Submitted by Design Engineer: Date of DRAFT Approval by Town of Holly Springs: Date of Approval by Town of Holly Springs: 16024 O &M Document Page 1 of 7 9.25.09 Structural Stormwater Best Management Practice (BMP) Maintenance Agreement SWMF 46 (Wet Pond) Note: Maintenance intervals of the various overall BMP components is listed below. See section I and II of the attached Operations and Maintenance Manual for detailed maintenance procedures associated with the items below. I. Monthly or after every runoff producing rainfall, whichever come first: a. Entire BMP b. Perimeter of Wet Detention Basin c. Inlet & Outlet Device d. Forebay e. Vegetated Shelf II. Quarterly a. Drainage Area of the Wet Detention Basin b. Main Treatment Area c. Receiving Water III. Semi - Annually a. Aquatic Environment IV. Annually a. Annual Inspection & Certification by Registered Professional Engineer to TOHS b. Quarterly Inspection Reports c. Inspection of Dam Embankment by Dam Safety Expert d. Sediment and Dredging 1, . hereby acknowledge that I represent the financially responsible party for maintenance of the Structural Stormwater Best Management Practices for this site. I will perform the maintenance as outlined above for this project. Operation and maintenance responsibilities may be transferred to the HOA/OWNER upon completion, contingent upon the Town of Holly Springs approving that all installation, performance measures and documentation are in compliance with the approved stormwater management plan. Signature: Date: 1, , a Notary Public of the State of , County of do hereby certify that personally appeared before me this day of, and acknowledge due execution of the foregoing instrument. Witness my hand and official seal, Seal My Commission Expires: 16024 O &M Document Page 2 of 7 9.25.09 OPERATIONS & MAINTENANCE MANUAL Project Name & Phase: Holly Springs Towne Center - Phase 2 Information: The wet pond (SWMF #6) will be constructed and maintained by KRG New Hill Place, LLC. Attn: David George. Phone (317) 713 -5646 Fax (317) 577 -7879 email daeorQe(akiterealtv.com. The BMP(s) is /are located on property owned by KRG New Hill Place, LLC. Deed Book XXXX Page XXXX. A stormwater surety or another approved instrument will be provided in the amount equal to the replacement cost of the pond plus 50 %. Date Constructed: Location: Holly Springs Towne Center - Phase 2 Receiving Watercourse(s): Unnamed Tributary to Little Branch Contractor: (applicable structure) Example add impoundment & dam info. (applicable structure) Example add spillway info. (applicable structure) Example add spillway channel info. Material Supplies: Riser Structure 4'x 4' Square Concrete Outlet Barrel 24 " O -ring RCP Riprap Velocity Dissipator NCDOT Class `B' Riprap 121 x 6'W x 22 " Thick 16024 O &M Document Page 3 of 7 9.25.09 Project Name & Phase: Holly Springs Towne Center - Phase 2 Type of BMP: Wet Pond (SWMF #6) Type of BMP: This manual established procedures for maintenance and operation of the wet pond (SWMF #6). I. MAINTENANCE Frequency: Inspection Frequency Quarterly and within 24 hours after every water quality storm (greater than 1.0 inch) Annual Certification Important Maintenance Procedures: Inspection Type Inspection must be conducted by a trained, qualified party. These inspections are intended to identify obvious maintenance needs early in order to prevent more extensive corrective actions. Inspection must be conducted by a Professional Engineer. These inspections are intended to provide a more thorough assessment of the facility. Annual inspection reports (sealed by the PE) must be submitted to the TOHS Engineering Department. Field survey calculations to confirm storage volume and embankment stabilization, etc. may be required on a case by case basis. - Immediately after the wet detention basin is established, the plants on the vegetated shelf and perimeter of the basin should be watered twice weekly if needed, until the plants become established (commonly six weeks) - No portion of the wet detention pond should be fertilized after the first initial fertilization (if required) to establish the plants on the vegetated shelf. - Stable ground cover should be maintained in the drainage area to reduce the sediment load to the wet detention basin. - If the basin must be drained for an emergency or to perform maintenance, the flushing of sediment through the emergency drain should be minimized to the maximum extent practical. - Once a year, a dam safety expert should inspect the embankment Detailed Maintenance Procedures: BMP element Entire BMP Drainage area of the BMP Perimeter of the wet detention basin Inlet device: pipe or swale Potential problem Trash/debris is present. Ground cover is unstable, or loose soil or is available for erosion Areas of bare soil and/or erosive gullies have formed Vegetation is too short or too long. The pipe is clogged. The pipe is cracked or otherwise damaged. 16024 O &M Document Page 4 of 7 9.25.09 How to remedy the problem Remove the trash/debris. Stabilize groundcover or remove loose soil or debris. Regrade the soil if necessary to remove the gully, and then plant a ground cover and water until it is established. Provide lime and a one- time fertilizer application. Maintain vegetation at a height of approximately six inches. Unclog the pipe. Dispose of the sediment properly. Replace the pipe. Forebay Vegetated shelf Aquatic environment Main treatment area Embankment Outlet device Receiving water 16024 O &M Document 9.25.09 Erosion is occurring in the swale Sediment has accumulated to a depth greater than the original design depth for sediment storage. Erosion has occurred. Weeds are present. Refer to vegetation maintenance table. Water quality monitoring indicates that parameters such as water clarity, algal growth, and others are outside of acceptable levels. Sediment has accumulated to a depth greater than the original design sediment storage depth. Algal growth covers over 50% of the area. Cattails, phragmites or other invasive plants cover 50% of the basin surface. Shrubs have started to grow on the embankment. Evidence of muskrat or beaver activity is present. Tree(s) have started to grow on the embankment. Annual inspection by appropriate professional shows that the embankment needs repair. Clogging has occurred. The outlet device is damaged Erosion or other signs of damage have occurred at the outlet. Page 5 of 7 Regrade the swale if necessary to smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future problems with erosion. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Remove the weeds, preferably 'by hand. If pesticide is used, wipe it on the plants rather than spraying. Identify the source of the problem and correct it. Conduct follow -up monitoring to ensure that the parameters have resumed acceptable levels. Search for the source of the sediment and remedy the problem if possible. Remove the sediment and dispose of it in a location where it will not cause impacts to streams or the BMP. Consult a professional to remove and control the algal growth. Remove the plants by wiping them with pesticide (do not spray). Remove shrubs immediately. Use traps to remove muskrats and consult a professional to remove beavers. Consult a dam safety specialist to remove the tree. Make all needed repairs. Clean out the outlet device and properly dispose sediment. Repair or replace the outlet device. Contact the TOHS Engineering Department II. OPERATION A. Record Keeping The Town of Holly Springs shall be provided with written inspection reports as specified in this manual. These reports shall be provided annually within 30 days of the anniversary of receipt of the "Stormwater BMP /O &M Responsibility Transfer" letter (form #16037). A professional engineer shall certify the reports. The Town of Holly Springs Engineering Department shall be notified as soon as any deficiencies in the detention structure are recorded. The Town shall be notified of the proposed methods to bring the structure into conformance and furthermore, the Town shall approve of any proposed work to be completed on any part of the structure prior to any work being started. After work has been completed the Town shall inspect and approve of the work before it shall be considered complete. After the Town approves the work an as -built drawing shall be completed and provided to the Town. Note: Operation of a BMP should include the following: • Annual & Ouarterly Inspection Reports — a collection of a written inspection report should be kept on record, Inspection should be conducted at minimum quarterly and certified by a professional engineer annually. • Observations — all observations should be recorded. Where periodic inspections are performed following significant rainfall events, these inspections should be logged on the log forms found in Appendix D of the Town's Design Manual or created specifically for the project. • Maintenance — written records of maintenance and /or repairs should be recorded on the Operation & Maintenance Log Form found in Appendix D of the Town's Design Manual or created specifically for the project. • Other Operation Procedures — the owner should maintain a complete and up -to -date set of plans (as -built drawings) and all changes made to the dam over time should be recorded on the as- builts. Mylar and digital as- builts shall be provided to the Town each time they are updated. • Ouarterly Operation and Maintenance Lots - will be kept on file by the Owner or Responsible Party for each Structural BMP. Forms to be used to create Inspection and Maintenance Logs for each BMP are provided in the Appendix to this BMP Manual. • Annual inspection and maintenance certifications - must be filed with the TOHS. A digital photograph must be taken at the time of inspection and after maintenance for each BMP. These must be kept on file, with a hard copy filed in the Inspection and Maintenance Log. There are various training, qualification and certification programs for available for BMP inspectors, it is recommended that all parties filling out quarterly operation and maintenance logs to be trained appropriately for each BMP inspected. B. Sedimentation & Dredging Sedimentation from establishing areas tributary to the BMP may eventually result in the reduction of the storage volume and eventually will have to be removed. The frequency of this sediment removal can be reduced by ensuring that the site areas around the building be stabilized with a vegetative ground cover such that it restrains erosion. This would include a periodic application of fertilizer and other treatments necessary to promote a stable groundcover and minimize sedimentation to the BMP. The maintenance on this BMP requires that the main pool and forebay both be cleaned out when the accumulated sediment depth equals 1 -foot (elevation 315.00 in forebay and elevation 314.00 in main pool). For aesthetic purposes it may be desirable to maintain it prior to this point. The removed material should be hauled offsite to a suitable landfill site or mounded somewhere on site and stabilized with a groundcover sufficient to restrain erosion. 16024 O &M Document Page 6 of 7 9.25.09 III. INSPECTION, OPERATION & MAINTENANCE LOGS (attach a blank copy of the applicable O&M log for each BMP) (attach 8 '/_2 x 11 Location Map) (attach 8 % x 11 copy of Recorded Plat(s)) (attach the Stormwater Management Plan, including form #16012 and As- builts) (attach Engineer Certifications for construction of each BMP) 16024 O &M Document Page 7 of 7 9.25.09 HOLLY SPRINGS TOWNE CENTER - PHASE 2 HOLLY SPRINGS, NORTH CAROLINA STORMWATER IMPACT ANALYSIS & FINAL DESIGN OF STORMWATER MANAGEMENT FACILITIES PROJECT NUMBER: DESIGNED BY: DATE: 'J KRG -11010 JOSH ALLEN, PE, CFM TAYLOR EDMONDS, El FEBRUARY 2015 MCADAM S 2905 MERIDIAN PARKWAY DURHAM, NORTH CAROLINA 27713 NC Lic. # C -0293 :a _SEAL j •'.� 3'7r� r-. � HOLLY SPRINTOWNE CENTER - PHASE 2 Stormwater Impact Analysis and Final Design of Stormwater Management Facilities General Site Description Located adjacent to NC Highway 55, at its northwest intersection with New Hill Road (S.R. 1152) in Holly Springs, North Carolina, is the proposed commercial development currently known as Holly Springs Towne Center. Proposed development on this approximately 168 -acre site will ultimately consist of the construction of commercial /retail buildings and outparcels, parking, sidewalks, streets, along with the associated infrastructure, utility, and stormwater management improvements. Proposed for construction at this time is Phase 2 of the project along with the stormwater management facilities associated with this area. The stormwater management facilities designed for this submittal (SWMF #5 and #6) are designed for the ultimate build out of the thoroughfare and the future phase of Holly Springs Towne Center. The final design calculations for SWMF #l, #2, 43, #4, and #8 were previously submitted to and approved by the Town under separate cover as part of Phase 1. Holly Springs Towne Center is located within the Cape Fear River basin and will be subject to the stormwater management requirements set forth in Section 8, Article 5 of the Town of Holly Springs Code of Ordinances NPDES Phase II Post - Construction Stormwater Regulations (Adopted November 6, 2007). This ordinance requires that development properly manage stormwater runoff rate, volume, and pollutants as necessary to protect the environment, property, health, safety, and welfare of the Town's citizens. This report contains the final design calculations detailing the expected stormwater impacts as a result of the proposed development of Phase 2, along with final designs of only the proposed stormwater management facilities that are located in this area (SWMF #5 and #6) that will be used to mitigate the impacts. Please refer to the previously approved Phase 1 plans /calculations for details associated with SWMF #1, #2, #3, #4, and #8. Current Applicable Stormwater Management Regulations More specifically, stormwater management for the proposed development shall be designed in accordance with the following: Town of Holly Springs Code of Ordinances — Section 8 -232 — NPDES Phase II Post - Construction Stormwater Regulation Development Standards All development for which a land disturbance permit is required (20, 000 sq.ft. or greater of disturbed area) shall implement Structural and Non - Structural BMPs that comply with each of the following performance standards. The Structural and Non - Structural BMPs shall control and treat: 1. The difference in stormwater runoff peak discharge rate leaving the project site between the pre- and post- Development conditions for, at a minimum, the I -Year, 24 -Hour Storm (2.83 inches). Runoff volume drawdown time shall be a minimum of twenty-four (24) hours, but not more than one hundred and twenty (120) hours. 2. The total nitrogen (TN) export limitations, in a manner consistent with the Neuse Basin Rules, 15A NCAC 2B.0233, will be required throughout the Town and extra territorial jurisdiction. The Town Council may establish Fee in Lieu for nitrogen export and may amend and update the fees and policies from time to time. Fee costs and policies will be outlined in the Design Manual. 3. A minimum of 85% average annual removal for Total Suspended Solids (TSS); 4. General engineering design criteria for all projects shall be in accordance with 15A NCAC 2H. 1008(0, as explained in the Design Manual; 5. All Built -Upon Area shall beat a minimum of 30 feet landward of all perennial and intermittent surface waters, as described in Section 7.06 of the UDO. Addressing Current Stormwater Management Regulations The proposed stormwater management plan for Holly Springs Towne Center Phase 2 will be designed to protect the downstream environment. The plan incorporates biologically based stormwater management techniques to manage both water quantity and quality aspects of site runoff. As can be seen in this report, stormwater management for Holly Springs Towne Center Phase 2 will be accomplished by incorporating engineered stormwater best management practice facilities throughout the phase to capture and treat the stormwater runoff from developed areas. The stormwater treatment devices that will be used are wet detention basins which are designed to remove a minimum of 90% average annual total suspended solids (TSS), provide slow release (i.e. 2 to 5 days) of the difference in pre- to post - development peak runoff rate for the 1 -year, 24- hour storm, and limit nitrogen export in a manner consistent with the Neuse Basin Rules 15A NCAC 213.0233. These facilities will serve the dual purpose of water quality and water quantity (ie. detention) control. Discussion of Nitrogen Export Calculations The total nitrogen (TN) export limitations, in a manner consistent with the Neuse Basin Rules 15A NCAC 213.0233, will be required throughout the Town and extra territorial jurisdiction. In accordance with these rules, projects shall use a nitrogen export standard of 3.6 lbs /ac /yr. However, before using offset payments, the development must achieve, at a minimum, a nitrogen export that does not exceed 6.0 lbs /ac /yr for residential development and 10.0 lbs /ac /yr for multi- family, commercial or industrial development. For the purpose of nitrogen export computations, a 177.13 -acre total nitrogen analysis area was created that encompasses all onsite construction, future outparcels, the thoroughfare road, and a portion of the offsite roadway improvements (see nitrogen exhibit for a graphic representation of the total nitrogen analysis area). Nitrogen export calculations for Phase 1 of the project only were previously submitted to and approved by the Town of Holly Springs. At this current time, Phase 2 of the project is proposed, resulting in the need to modify the previously submitted nitrogen calculations for Phase 1 to incorporate Phase 2. Phase 1 of the project comprised approximately 76.87 -acres of the 177.13 -acre total nitrogen analysis area. With Phase 2 incorporated, the resulting nitrogen analysis area is now 112.25- acres. The remaining portions of the project (i.e. future phases /outparcels) were not included in the nitrogen export calculations and will be required, at the time of their development, to update these nitrogen export calculations once again to incorporate their particular phases /outparcel into the nitrogen calculations. In the event these phases /outparcels are never developed, the attached calculations show that Phases 1 and 2 together stand alone with respect to meeting the applicable nitrogen export regulations. Discussion of Pre -Post Analvsis During preparation of the 2008 Development Plan, it was indicated by the Town of Holly Springs that Holly Springs Towne Center will also be required to meet the requirement of no increase in the 100 -year post- development peak water surface elevations in the receiving downstream Forest Springs Subdivision tributaries. To accomplish this, it was agreed to that the stormwater management plan design for Holly Springs Towne Center will be required to demonstrate that the 100 -year post - development peak flowrates exiting the property are less than or equal to the 100 - year pre - development peak flowrates within the receiving downstream Forest Springs Subdivision tributaries listed in the Forest Springs Subdivision flood study. As you can see from the report, the post- development peak flow rates have been detained back to pre - development peak flow rates in the 1 -year and 100 -year storm events for POA# 1, POA #2, and POA #3. The post - development peak flow rates for the 1 -year storm at POA #5 are higher than the pre - development peak flow rates, however there no there is no proposed impervious area draining to this point. The increase in flow is a result in the reduction of the time of concentration for the drainage area. It is the opinion of the design engineer that the minor increases in the 1- year storm will not adversely impact the downstream receiving waters, as it is discharging into the floodplain for Little Branch. Calculation Methodoloev 1) Rainfall data for the Holly Springs, NC region is from NOAA Atlas 14, with a partial duration series assumption for the 1 -year and 10 -year storms and annual duration assumption for the 100 -year storm. The 1- year /24 -hour rainfall depth is 2.89 inches and the 10- Year /24- hour rainfall depth is 5.09 inches, and the 100 - year /24 -hour rainfall depth is 7.60 inches. These rainfall depths were input into the meteorological model within PondPack for peak flow rate calculations. Please reference the rainfall data section within this report for additional information. 2) The 1 -year / 24 -hour design storm is assumed to be a total rainfall depth of 2.89 inches, assuming an SCS Type II rainfall distribution. 3) Existing topographic information is a combination of boundary surveys by Withers and Ravenel Kenneth Close Surveying, LIDAR aerial topographic mapping from NC Floodmaps, and site survey by The John R. McAdams Company, Inc. 4) Using maps contained within the Wake County Soil Survey, the on- and off -site soils were determined to be from either hydrologic soil group (HSG) `B' soils or HSG `D' soils. Since the method chosen to compute both pre- and post - development peak flow rates and runoff volumes is dependent upon the soil type, care was taken when selecting the appropriate Soil Conservation Service Curve Number (SCS CN). a) Within each sub - basin, a proportion of each soil group was determined using NRCS Soil Survey Maps. Once a proportion was determined, a composite SCS CN was computed for each cover condition. For example, the pre - development condition of Sub -basin #2B consists of approximately 77.5% HSG `B' soils and 22.5% HSG `D' soils. Therefore, for the open area cover condition, the composite SCS CN is computed as follows (assuming good condition): _ Composite Open SCS CN= (0.775 *61) + (0.225 *80) = 65 b) This type of calculation was done for each of the studied sub - basins in the pre- and post - development condition in an effort to accurately account for the difference in runoff between HSG `B' soils and HSG `D' soils. 5) A composite SCS Curve Number was calculated for the post - development condition for each subbasin using SCS curve numbers and land cover conditions. Land cover conditions for the onsite post - development condition were taken from the proposed development plan. 6) In the pre - development condition, the times of concentration are calculated using SCS TR -55 (Segmental Approach, 1986). The Tc flow path was divided into three segments: overland flow, concentrated flow, and channel flow. The travel time was then computed for each segment, from which the overall time of concentration was determined by taking the sum of each segmental time. 7) The post - development times of concentration to each stormwater facility are assumed to be 5 minutes in the post - development condition. This is a conservative assumption. 8) PondPack Version V8i was used in determining the pre- & post - development peak flow rates for the 1 -, 10 -, and 100 -year storm events, as well as routing calculations for the proposed stormwater management facilities. 9) The stage - storage functions for the proposed stormwater management facilities were all generated outside of PondPack and then input into PondPack for final routing calculations. 10) Water quality sizing calculations for each facility were performed in accordance with the N.C. Stormwater Best Management Practices manual (NCDENR July 2007). The normal pool surface area for each wetland facility was sized using the runoff volume computed using the Simple Method and a maximum ponding depth of 12- inches. 11) Velocity dissipaters will be provided at the stormwater management facility principal spillway outlets to prevent erosion and scour in these areas. The dissipaters are constructed using rip rap, underlain with a woven geotextile filter fabric. The filter fabric is used to minimize the loss of soil particles beneath the rip rap apron. The dissipaters are sized for the 10 -year storm event using the NYDOT method. It is a permanent feature of the outlet structures. 12) For 100 -year storm routing calculations, a "worst case condition" was modeled in order to insure the proposed facilities would safely pass the 100 -year storm event. The assumptions used in this scenario are as follows: a) The starting water surface elevation in each facility, just prior to the 100 -year storm event, is at the top of riser elevation. This scenario could occur as a result of a clogged siphon or a rainfall event that lingers for several days. This could also occur as a result of several rainfall events in a series, before the inverted siphon has an opportunity to draw down the storage pool between NWSE and the riser crest elevation. b) An attempt was made to achieve a minimum of approximately 1.0 -ft of freeboard between the peak elevation during the "worst case" scenario and the top of the dam for each facility. 13) Stormwater Management Facility #5 and #6 are proposed facilities that have not yet been constructed. However, Stormwater Management Facility #4 was constructed as a part of Phase 1 and is currently serving as an erosion control sediment basin. A portion of Phase 2 will drain to the Stormwater Management Facility #4, therefore the calculations have been included in this report to show that the facility will still function properly with the proposed post - development conditions. Conclusion If the development on this tract is built as proposed within this report, then the requirements set forth in the applicable Town of Holly Springs regulations will be met with the proposed stormwater management facilities. However, modifications to the proposed development may require that this analysis be revised. Some modifications that would require this analysis to be revised include: 1. The proposed site impervious surface exceeds the amount accounted for in this report. 2. The post - development watershed breaks change significantly from those used to prepare this report. The above modifications may result in the assumptions within this report becoming invalid. The computations within this report will need to be revisited if any of the above conditions become apparent as development of the proposed site moves forward. 1 SUMMARY OF RESULTS 2 MISCELLANEOUS SITE DATA 3 PRECIPITATION DATA 4 WATERSHED SOILS DATA 5 PRE - DEVELOPMENT HYDROLOGY CALCULATIONS 6 POST - DEVELOPMENT HYDROLOGY CALCULATIONS STORMWATER MANAGEMENT 7 FACILITY #4 DESIGN CALCULATIONS STORMWATER MANAGEMENT 8 FACILITY #5 DESIGN CALCULATIONS STORMWATER MANAGEMENT 9 FACILITY #6 DESIGN CALCULATIONS NUTRIENT LOADING IO CALCULATIONS SUMMARY OF RESULTS HOLLY SPRINGS TC KRG -11010 HOLLY SPRINGS TC SUMMARY OF RESULTS J. ALLEN, PE KRG -11010 2/2/2015 RELEASE RATE MANAGEMENT RESULTS POINT OF ANALYSIS #1 Return Period Pre -Dev Post -Dev % Increase [cfs] [cfs] [ %] 1 XT--- o IM '7 Aoi 100 -Year 395.17 206.91 - 47.6% [cfs] [cfs] POINT OF ANALYSIS #2 1 -Year 7.23 6.80 Return Period Pre -Dev Post -Dev % Increase 76.68 [cfs] [cfs] 1 -Year 7.69 6.14 -20.2% 100 -Year 259.93 91.90 - 64.6% POINT OF ANALYSIS #3 Return Period Pre -Dev Post -Dev % Increase [cfs] [cfs] [ %] 1 -Year 7.23 6.80 -5.9% 100 -Year 90.83 76.68 -15.6% POINT OF ANALYSIS #5 Return Period �' Pre -Dev Post -Dev % Increase [cfs] [cfs] [ %] _ 1 -Year 5.75 9.10 58.3% 100 -Year 50.32 49.72 -1.2% HOLLY SPRINGS TC SUMMARY OF RESULTS KRG -11010 STORMWATER MANAGEMENT FACILITY #4 SUMMARY Design Drainage Area = 8.28 acres Design Impervious Area = 4.60 acres % Impervious = 55.6% Top of Dam = 365.00 ft NWSE = 360.00 ft Surface Area at NWSE = 20,459 sf Water Quality Volume = 16,531 cf Water Quality Volume Ponding Depth = 9.80 inches Siphon Diameter = 2.500 inches Siphon Elevation = 360.00 ft Secondary Orifice Diameter= (1) 1.2'x 0.25' Secondary Orifice Elevation = 361.00 ft Riser Size = 4'x 4' Riser Crest = 363.00 ft Barrel Diameter = 24 inches # of Barrels = 1 Invert In = 357.00 feet Invert Out = 356.00 feet Length = 60 feet Slope = 0.0167 ft/ft STORMWATER MANAGEMENT FACILITY #4 ROUTING RESULTS Return Period Inflow Outflow [ft] [cfs] [cfs] 1 -Year 21.21 0.70 10 -Year 42.52 1.84 100 -Year 60.10 16.94 100 -Year - Worst Case 60.10 29.33 J. ALLEN, PE 2/2/2015 Max. WSE Freeboard [ft] [ft] 361.23 3.77 362.73 2.27 363.45 1.55 363.69 1.31 HOLLY SPRINGS TC SUMMARY OF RESULTS KRG -11010 STORMWATER MANAGEMENT FACILITY #5 SUMMARY Design Drainage Area = 21.02 ac Design Impervious Area = 10.16 ac % Impervious = 48.3% Top of Dam = 334.00 ft NWSE = 326.50 ft Average Depth = 4.68 ft Surface Area at NWSE = 22,405 sf Required Surface Area at NWSE = 19,554 sf Siphon Diameter = 3.000 in Siphon Elevation = 326.50 ft Secondary Orifice Diameter = (2) 2'x 0.5' 332.45 Secondary Orifice Elevation = 328.80 ft Riser Size = 4'x 4' 1.19 Riser Crest = 332.30 ft Barrel Diameter = 24 in # of Barrels = 1 Invert In = 322.50 ft Invert Out = 322.00 ft Length = 57 ft Slope = 0.0088 ft/ft STORMWATER MANAGEMENT FACILITY #5 ROUTING RESULTS J. ALLEN, PE 2/2/2015 Return Period Inflow Outflow Max. WSE Freeboard [cfs] [cfs] [ft] IN 1 -Year 40.66 0.59 328.66 5.34 10 -Year 92.8 11.32 330.25 3.75 100 -Year 139.05 21.87 332.45 1.55 100 -Year - Worst Case 139.25 34.97 332.81 1.19 HOLLY SPRINGS TC SUMMARY OF RESULTS KRG -11010 Max. WSE [ft] Freeboard [ft] STORMWATER MANAGEMENT FACILITY #6 SUMMARY 42.85 Design Drainage Area = 17.65 ac Design Impervious Area = 10.21 ac % Impervious = 57.8% 100 -Year Top of Dam = 326.00 ft NWSE = 320.00 ft Average Depth = 3.80 ft Surface Area at NWSE = 26,047 sf Required Surface Area at NWSE = 22,203 sf Siphon Diameter = 3.000 in Siphon Elevation = 320.00 ft Secondary Orifice Diameter = (3) 2'x 0.5' Secondary Orifice Elevation = 322.30 ft Riser Size = 4'x 4' Riser Crest = 324.50 ft Barrel Diameter — 24 in # of Barrels = 1 Invert In = 316.50 ft Invert Out = 316.00 ft Length = 55 ft Slope = 0.0091 ft/ft STORMWATER MANAGEMENT FACILITY #6 ROUTING RESULTS J. ALLEN, PE 2/2/2015 Return Period Inflow [cfs] Outflow [cfs] Max. WSE [ft] Freeboard [ft] 1 -Year 42.85 0.34 322.22 10 -Year 88.15 12.42 323.24 2.76 100 -Year 126.00 29.07 324.78 1.22 100 -Year - Worst Case 126.00 36.01 324.99 1.01 HOLLY SPRINGS TC SUMMARY OF RESULTS KRG -11010 NUTRIENT LOADING OUTPUT Phase 1 and 2 Site Area = 112.25 acres Post Development Nitrogen Loading = 1,200.63 lb /yr 10.70 lb /ac /yr Nitrogen Loading Allowable = 404.12 lb /yr 3.60 lb /ac /yr NUTRIENT LOADING AFTER TREATMENT Post Treatment Nitrogen Loading = 820.38 lb /yr = 7.31 lb /ac /yr COMPUTATION OF REMAINDER TO BE OFFSET WITH PAYMENT Phase 1 and 2 Nitrogen Loading to be Offset = 416.27 lb /yr = 3.71 lb /ac /yr = 12,488.04 lbs Phase 1 Nitrogen Loading (Previously Offset) = 420.52 lb /yr = 5.45 lb /ac /yr = 12,615.66 lbs Remaining Phase 2 Nitrogen Loading Credit = 127.62 lbs J. ALLEN, PE 2/2/2015 MISCELLANEOUS SITE DATA HOLLY SPRINGS TC KRG -11010 78° 52' )0.00" 78 51 )0.00" 78° 50 )0.00" �Z _ . Fit 0 Feltonvtlle M �w �r 1J try � .. _\ -, B �, - %�• �j'a } E r jig ----------- Z LO Ills SCALE 1:24000 it" Z r 4CGC t = +r' - ; 0 1 MILES _ 0 '1000 YARDS o _ Atrjgrt o : 0 1 KILOMETER o Eo 00 91 w J. M �I� Q� 0 678° 52' x0.00" VW 78 51 )0.00" 078° 50'p0.00" V' I o Copyright (C) 1998, Maptech, Inc. l Name of Stream Description Cuff. Class Tom Jack Creek From source to Harris C Lake, Buckhorn Cr. i Branch From source to Harris C Lake, Buckhorn Cr. Cary Branch From source to Harris C Lake, Buckhorn Cr. Norris Branch From source to Cary C Branch Utley Creek From source to Harris C Lake, Buckhorn Cr. White Oak Creek From source to Harris C Lake, Buckhorn Cr. Big Branch From source to White C Oak Creek Little Branch From source to Big C Branch Little White Oak From source to Harris C Creek Lake, Buckhorn Cr. Big Branch From source to Harris C Lake, Buckhorn Cr. Thomas Creek From source to Harris C Lake, Buckhorn Cr. NEUSE RIVER From dam at Falls Lake WS- IV;NSW to a point 0.5 mile upstream of Town of Wake Forest proposed water supply intake (Former water supply intake for Burlington Mills Wake Finishing Plant) NEUSE RIVER From Town of Wake C;NSW Forest proposed water supply intake to mouth of Beddingfield Creek NEUSE RIVER From a point 0.5 mile WS- IV;NSW,CA upstream of Town of Wake Forest proposed water supply intake to Town of Wake Forest proposed water supply intake Date Basin Stream Index 09/01/74 Cape Fear 18 -7 -10 09/01/7-4 Cape Fear 18 -7 -4 - 09/01/74 Cape Fear 18 -7 -5 09/01/74 Cape Fear 18 -7 -5 -1 04/01/59 Cape Fear 18 -7 -5.5 04/01/59 Cape Fear 18 -7 -6 09/01/74 Cape Fear 18 -7 -6 -1 09/01/74 Cape Fear 18- 7 -6 -1 -1 09/01/74 Cape Fear 18 -7 -7 04/01/59 Cape Fear 18 -7 -8 09/01/74 Cape Fear 18 -7 -9 07/01/04 Neuse 27- (20.7) 08/03/92 Neuse 27- (22.5) 07/01/04 Neuse 27 -(22) NEUSE RIVER From mouth of WS -V;NSW 08/03/92 Neuse 27 -(36) Beddingfield Creek to a point 0.2 mile downstream of Johnston County SR 1700 NEUSE RIVER From I -85 bridge to WS- IV,B;NSW,CA 08/03/92 Neuse 27 -(5.5) (Falls Lake dam at Falls Lake below normal pool elevation) Page 3 of 13 2010 -10 -09 07:08:27 Print Page - NC Areas Subject to Phase II Post - Construction & Other Storrawater Progra.,. Page I of I NC Areas Subject to Phase II Post - Construction & Other Stormwrater Program Requirements Map LagaM heal Reach Sacen"Iv Roads .D � Primary Roach ' us we wy.arar _ ,. counties ! * L 1.24K Hy&"raPhy (Area) i Munitlpal Rouadartaa Slermwater lu riadiction 'c ■ Caaatal State SIN ►ragas 0 lacai P-_ - - - ar. - State Stanwa -tar Hayrawa wa St— at—fto rare - 6veArPYlaa heyraata c ,. Phase II area . SA Mate- http, // 1 49.168.87.13 /stormwater /print. aspx ?CMD= INIT &XMIN =- 78.91392639317891 &... 10/12/2010 I Results The map representations are the best available (Contact : 11H011y Springs as of July 27, 2010. Please check with the local government (city or county) in your location to DENR verify specific stormwater requirements. (Region : IlRaleigh Areas subject to Stormwater Post - Construction County : ,(WAKE (Permitting) are based on existing programs and Session Law 2006 -246. NC Division of Water Quality, 10/12/2010 +Permitting : Local ' +Basis : I,In Permitted Phase II Jurisdiction 'Type : IlPhase II Entity (Notes : iI IlInside Holly Springs 1Phase 2 : ,Local program satisfies Phase II rqmts krisdiction: ,Holly Springs J http, // 1 49.168.87.13 /stormwater /print. aspx ?CMD= INIT &XMIN =- 78.91392639317891 &... 10/12/2010 ate. -0 711 FAA I �4j At Q1 40� N IML. 7Vft . . . . . . . . . . . - w.;4f WN 10 WIL vj- AV K- RK • Tov�n of MAIN Springs Era. IL Future Land Use Plan Gateway and Small Area Plans I= M M . Village District Area Plan I U 0 ,ru"n of MAIN Springs 2. Northeast Gateway Plan oil W// % , I� ..• �..1�/ ►. WMA 3. Southern Gateway Plan NOW- IN, Ma ur�ll ■.1. ■■ 1 -- &NILTIOL. f 0 2012 -05 -14 11:37:03 1 KIP Color Max 1 1.5 Build No 3.57.88.0 1 KIP Color Scanner I scandpi 300 I Filter: Line /Photo I HP Desigrl►et 1050c i 300 dpi, Normal (accelerated), Rainbow Standard I HP Coated Paper I Ink LirMt =100 %, Gamma Correction =l.$ I plotdpi 300 1 scaling= 100% 1 kip9CLEMONSNA STATE OF NORTH .CAROLINA FIRM PANEL LOCATOR DIAGRAM fL00.0110691 41fnipu FROM 7t3.6 #r 3a» .� • c a,� {) # i 44 � r :l ac ,lo1N8 RANEL 0? o Ta•30' �o' 04 Sao FEET LEGEND l _ ,.1 r t i rRANVI�I ( f 700 �, �� t i , _ - �, �.v J.•, .. BARD AREAS (sHAs) sul3jECT TO AL FLOOD H .. r..A. I- A °` _, . _ r. _. -.. t_..., . -f --¢- - t,,.: , ham, t ZONE X '' FEET INUNDATION BY THE 1% ANNUAL_ CHANCE FLOOD tl/ r •...,,, w... J 4'} -'�` ZONE X .. €- - - ,� The 19A annual chance flood (100 --year flood), also known as the base flood, is the flood _ ., that has a 1 % chance of being equaled or exceeded in any given year. The Special x 1 ,tiAtvi i i ^f,AYKt�I FLOODING EFFECTS ROM--- . ' ^�•^.� - s j 8 Y ` - r Flood Ffisrard Area is he area subject to flooding b the 196 annual chance flood. Areas w� of Special Flood Hazard include Zones A, AF.. AH AU AR, A99 V, and VE, The Base LITTLM BRANCt! " P ...r .a. r. wb; Y i •; ZONE X '" LtDf i1~ h, Flood Elevation Is the water-surface (BASIN 2S, STREAM ., „•.,:...- elevation of the 1% annual chance Road. I l- Bast, Elevations ed. "� � ZONE A No fie Flood Et determined. 1, . t i ZONE AN Base Flood Elevations determined. k-4— wet, ! .• '` .fir" ZONt AE 3 ONE JiMt depths of 1 to 3 feet (usually art�as of pondin�; Base Flood ?: `, LONE: X �` ,,��_ ' I,, . * _ R X�,ZONE ZONiE AO Flood de the of 1 to 3 feet (usually sheet flow nn sloptng terrain); ;V.... 1111i, t verage d the determined. For areas of alluvial fan flooc#ttlg, elocities i 4 r F sr also determined. v �i t _ J^ ZONE At Special Flood Hazard Area formerly protected from the 1g6 ensue( PA - " f chnce flood a (load cc7ntra! s steal that was subs uenti ✓ "I c by y eq Y ertified, Zone AR indicates that the former flood control system is i 1 1 ,�„ ,,,,,, �, .,,`.,,,,,,,,.,•,, .,.., . , ,. e , ' ,1 „� being restored to provide protection from the 196 annual chance- or �.; } greater Hood. • 1 j i F ZONE A99 A to be protected from 1 % annual chance flood by a Federal .1 protection sr-.tem under construction; no Base Flood Fievatlons c' a. Zow v'R� Coastal *•i=1 zone with velocity azard (wave action); tease Flood Elevations HARNETT b � t t i i ' i'; �` �' Town of determined, tY , ' Fi_ ODWAY AREAS iN ZONE AE J , 1 , f 1 � - 0 � Springs p � ��, i the it { Of _ ±1i . S il'1i1Tt? P e c: anne a stream plus any adjacent fioodplain areas that must be Jurisdiction keppt fvft if +! wroachment so that the I% annual chance flood can be catrrled without l)) ti k ; suilstartt�ld i ceases In flood heights. 1t Afi ,_ ... 1 ,' ,•,•,• oTEaEit Fl.00D AREAS �t Areas of 0.2% annual chance flood; areas o; future conditions 1% annual --•- z ~ chance flood; areas of 1% annual chance flood with average depths of less 1 foot or with drains areas Less than 'I square milli; and areas DATUM INFORMATION protected by levees from 1,°�annua! chance flood The projection used in the preparation of this map was the North Carolina a , ' 349 u , 11Vt�(� �,i- (., - OTHER AREAS State Plane (FiPSZONE 3200)" The horizontal datum was the North American ellipsoid. D' erences in datum elli sold projection, or Datum of 1983 GRSB Differences - f Areas deter ine to be o p P l _. -�- . _ ,. ._ . -« ,., ,.. ., .,,.. ., i • °, rtt d outside the 0.2 °� annual chance and future Universal Transverse Mercator zones used in the production of FIRMS for adjacent _ ... co _ flcx�dplafn. = is i conditions 1 4}'n annual chance jurisdictions may result in slight positional differences in map features across .• - ' ► Zl t 0 Areas in which flood hazards are undetermined, but possible. jurisdictional boundaries. These differences do not affect the accuracy of this µ f FIRM, All coordinates on this rna are In U.S, Survey Feet, where f } p ,r`` j` ,' COASTAL BARRIER RESOURCES 5YSl'!rM (CBRS) AREAS 1 U.S. Survey Foot = 1200/3937 Meters, Flood elevations on this map are referenced to the North American Vertical -... - ...... . T . __ �,,, O RViliSE PROTECTED TI1E AREAS (OPAs) Datum of 1968 {NAVE) 88), These flood elevations must be compared to Structure. ! CBFIS aroag and OPAs are nor o , and ground elevations referenced to the same vertical datum. An average s l' `j'�' loos Hazard Areas. .: adjacent to Special F ad within or 192 1 [ annual chance floodplain boundary Geodetic entice{ Datum of 9 ,.:,. ., ,, ,. �_ i . � � •`• _ v: normally f offset between NAVE) 88 and the National Geed V ' ,... ..: :: ,. � .1 iii 1,yt.l.i;�,t.it1l1 1' ,' ! (NGVD 29) has been computed for each North Carolina county. This offset was i `` a future ��;. ` , O 2 annum chance flacxfpfain boundary and fur conditions 1% annual chance flood lain bounds them applied to the NGVD 29 flood elevations that were not revised during the p boundary Floodwa ix�undaLy creation of this statewide format FIRM, The offsets for each county shown on ( f y this FiRM panel are shown in the vertical datum offset table below, Where a ,-- Zone Boundary . s Zn D i3 ndry county boundary and a flooding source with unrevised NGVD 29 flood elevations � � r,, w,.; , . ._. . , s�• 1r� CBRS and OPAa boundary, are coincident, an individual offset has been calculated and applied during the } " Boundary dividing Special Flood Hazard Area Zones and creation of this statewide format FIRM. See Section 6,1 of the accompanying F. , ,. boundary dividing Special Flood Hazard Areas of different Flood Insurance Study report to obtain further information on the conversion flood depths or flood velocities. elevations 'on between NAVD 88 and NGVD 29. To obtain current elevation, Base Flood Elevations, of It'vatl s of .. , _....... , , ._, _ ., .... u elevation description, and /or location information for bench marks shown on this map, `'' ^'^^�'�'S13^�^ ^^ Base Flood Elevation Line and value; elev ti in feet* please contact the North Carolina Geodetic Survey at the address shown below. '. , ( L gg n value where uniform within zone; # Base flood Elevation � �) elevation in feet* e You may also contact the Information Services Branch of the National Geodetic a *Referenced to the North American Vertical Datum of 1988 Survey at (301) 713.3242, or visit its website at www,ngs.noaa ^gov. c `` ""° °°'"•• : .., . •. -..., - , ... Cross section line North Carolina Geodetic Survey County Average Vertical Datum Offset Table .., J 121 West Jonas Street County vertical Datursl Offset (tit _ � • ; . - :. ,, , ,., • :,.4. „ ..;... , _ _ _ ,.: _ ..............,...� Tresses( fine Raleigh, NC 27601 wake - 0.913 Geographic coordinates referenced to the North American (913) 733x3936 t ^ i 97•Qi' 3d °, 32.22' 34" Datum of 1983 (NAD 83) www.ncgs.state.nc.us t"5 1r3t?(1 -meter Universal Transverse Mercator grid ticks, zone 17 M.. '�. 4278 h pe: NHVU tit's .F NUVIU 2b t (--0.88) ,..• -. � � ' '' i 477 500 FEET' 2300-foot rid values: North Carolina State Plane coordinate �xam t g „ -- system (FIPSZONE 3200, State Plane NAD 83 teet) North Carolina Geodetic Survey ench mark (see explanation f' "" l c)t'G'11` (?1 BM5510 X in the Datum information section of this FIRM panel). All streams listed in the Flood Hazard t}a'te, Table below were studied by x�- � �. detailed methods using field survey, Other flood hazard data shown on this ' map may have been derived using either a coastal analysis or limited detailed Sly 1 National Geodetic Survey bench manic (see explanation in s Datum informations o riverine analysis, More information on the flooding sources studied by these s M16 section n of this FIRM panel). 1 "(l40 3 x 3T 3;) a 'n the Flood Insurance Stu report. ® River Mile analyses is contained I �l/ p , .' 1,''+ A1:. C+• �ia�K• r' 1i,' �iR�tt• f�Rr4x.J F�'. i7E ,'��!�J.•.b'•i1i�°tYIT'.+r4�,�: iii. �, �� :Ny�! «�Jt?.A��f�'t+ ;y2.7!'4'�� '.�. � �... �- VWV :,. J fJ'1w,r ' : i f , r • _ r s t .(till ill4 -Y i yy a Ti Y. N' R Notice to isor: The ftp Nuinb*r shown nNov. s -outd be used when piecing map orders: tie Community Number shown above snouid be used or Insurance applications iortne sub)ect _. . V \/,` KL' COUNTY GRID NORTH MAP SCALE , W r a , • 250 0 fA0 1400 FEET 150 , , a• m PANEL 0648) I l`t:vN rt of Holly Spritigs Ca toanty ► l-, .�,tt-aicultorial brlsdicti(A Areas FLOOD INSURANCE RATE MAP 1 ♦ \ V ILD UM CAROLINA 370403 /h J P! i�♦ CQ PANEL 0849 Z iii :( x Y A, rY ti Z01\JE AE - _ ,+,,, ,.n. - •>rr..�.� a ,, t f, T ZONE s GU 000 C G . r X ZONE : ( h X U7UkF , l { acv, OW FfET 2 thQil 840 FM 78.51' 694 L- M e r 30 2 042 500 FEET TB•5['001, JOINS PANEL 0648 \20N i%'0 7V50'30" ! 4ab �►�' . _ _ �f >F (PAryNEL CO RAINS. NOTES TO USERS COMMUNITY CID No, PANEL SUFFIX This map is for use ir. administering 'tile Nartional Hood Insurance Program, It does not Certain areas not in Special Plond i4azwd r+,t,a ai ?'f'ea'r oe pry: ecte-d by flood control This map reflects more detalleo in o channel confi rattt"t than MAF' f m necessarily Identify Al areas subjecr, to #biding, particularly from focal drainage sources structures, Refer to SeOlof,: 4 <i Pri:-t%Mor, astz ' of the Flood Insurance those shown on the previous, 1FiRM fc , ts` -, ;' °cis � 'tts� i M (tii"t1 ,. The flo h od I ins p a and fioadwa s p Y Refer t listing f o !is 1 of Ma Re x AriB� IIdi t� i l 9 s 6` "fit rr G � � Orr' of small Six(. The community 1�a repository should be consulted fill possible P Study repel for information c_srl fli'ot'! ,!or'ewo . ?ruc.ft�rw- S''x i2ta j�,trisdict'ion. that were transferred from rht3 t +t: t`,..: !° i" M . - vt i ms's have teen adjusted to conform to updated or additional fl ood itza rd information, n i t hes e now stress As s , resuh,the Flood d Pro ' es and Floodway To obtain more dotaiisd i�tarnati on i- ar�as where Bass =laa� Eletatiots (BFEs) et e ta information and 9 eo ara da \ „a. ... . . - r ' t a r c p 1ts FIRM, were obtained from Date tables s ,' n the Fl o od Ir n rd e t r 1 t V�h l�n con t ai ns authoritative ' t o iv ehY dra u1 ic EFFECTIVE DATE OF �0 � PANE MAP PANE�. and/or 1 oodws have been der e rrin ed, use r s a r e ancourageo to consult the Flood various organizations, includIN the partlCiPating ts^al0w!i ;c.n"Ios), ttme and federal data) may rPfeCt Stre&rn 0haQnC4 , om #I* dow' frorn what is shown on this map. WAY 2 206 Profiles, Floodway Data, 'Urnited Devillied Flood Hazard Data, and/or Summary of Stillwater agencies, and /or other sources, Tt*- r`air Iry hws fr r this FIRM ITS A0481 imagtlry acquired by , Elevations Tables contained A thln the Flood Insurance Study IRS) report that accompanies Wake County. The time Viler #c }J }f - ut�tli3t' :ti�il3 for rite in? , ry its #999, Irtforn cation and � Please refer t the S t ,� ,r�c� o t apara e�lY pr'i t " ftp lnd*X fof an overview map of the county this FIRM. L)SL�Cfi 5iicluid t7t3 84Var13 that SEES Sl1AWn orl file FIRM f8>3resent rounded cos atial data supplied b 10 ? sxr; p F g p pp i y tt lodt# t si i t�itlt..x..t m ..r 1 .,, lltstl rnspj iiilcatfons •.e: :w.,e..: showing the layout of map p$°taiS, w i,,:, 4, ri i_ ; ,�,= rrsftlary addresses, and G Listin of 9 EFFECTIVE R CTiVE UAf) t lxvt3tk CG Ti," f'Ai%a. ._...__ ...-_.._. .�._ .,.�r....._,, ..,._...... a.., ;mot_ ..._. ... ._..�.. es.... Notice to isor: The ftp Nuinb*r shown nNov. s -outd be used when piecing map orders: tie Community Number shown above snouid be used or Insurance applications iortne sub)ect �f 1 itl� GRID NORTH MAP SCALE 1" = 500` (f 6,000) 250 0 fA0 1400 FEET 150 , fl 160 METERS 300 m PANEL 0648) FIRM Ca FLOOD INSURANCE RATE MAP 1 ♦ \ V ILD UM CAROLINA /h CQ PANEL 0849 (SEE LOCATOR DIAGRAM OR MAP INM FOR FIRM 1; LAYOUT) (PAryNEL CO RAINS. COMMUNITY CID No, PANEL SUFFIX i +43 i O _ SPRINGS, G S T OWN OF 370103 06 49 ,. 4 Q WAKE, COLNTY W.0368 0648 i i i Notice to isor: The ftp Nuinb*r shown nNov. s -outd be used when piecing map orders: tie Community Number shown above snouid be used or Insurance applications iortne sub)ect PRECIPITATION DATA HOLLY SPRINGS TC KRG -11010 Precipitation Frequency Data Server POINT PRECIPITATION Ate,. FREQUENCY ESTIMATES FROM NOAA ATLAS 14 _V North Carolina 35.664722 N 78.849167 W 298 feet from "Precipitation- Frequency Atlas of the United States" NOAA Atlas 14, Volume 2, Version: G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley NOAA, National Weather Service, Silver Spring, Maryland, 2004 Extracted: Tue Oct 12 2010 Confidence Limits Seasonality II Related Info (( GIS data Maps 11 Docs Precipitation Frequency Estimates (inches) Page 1 of 4 Return to State Map 5.86 7.77 9.62 12.24 14.61 16.56 7.05 9.20 11.20 14.04 200 0.81 I 1.28 1.61 2.51 3.52 4.45 4.97 6.08 7.45 8.44 9.50 10.30 11.40 12.26 15.47 17.75 21.18 24.18 500 0.85 1.34 1.69 2.69 3.86 4.95 5.62 6.91 8.55 9.57 10.73 11.60 12.80 13.63 17.13 19.39 22.89 25.94 1000 0.88 1.39 1.75 2.83 4.13 5.37 6.18 7.62 9.52 10.45 11.69 12.63 13.89 14.70 18.40 20.63 24.17 27.25 These precipitation frequency estimates are based on a oartial duration series. ARI is the Average Recurrence Interval. Please refer to NOM Atlas 14 Document for more information. NOTE: Formatting forces estimates near zero to appear as zero. * Upper bound of the 90% confidence interval Precipitation Frequency Estimates (inches) ARI **n 5 10 15 30 60 120 3 6 12 24 48 4 7 10 20 30 45 60 (years, day dzy day day day day da} 1� 0.45 0.72 �� 0 0.53 0.84 0 0.60 0.97 1.23 1.74 2.23 2.67 2.85 3.40 4.03 4.73 5.42 5.92 6.70 7.51 9.80 11.91 14.82 17.43 10 0.67 1.07 1.36 1.97 2.56 3.10 3.32 3.97 4.73 5.49 6.27 6.82 .7.65 8.51 10.99 13.21 16.27 19.02 25 0.74 1.18 1.50 2.22 2.95 F--]F--IF 62 .92 71 5.64 6.54 7.42 8.04 8.97 9.86 12.62 14.94 18.17 21.07 0.90 1 1.23 1 1.54 1 1.81 1.92 2 2.29 2 2.71 3 3.11 3 3.60 4 4.00 4.60 5 5.25 7 7.01 8.69 11.03 13.18 1.06 1 1.46 1 1.84 2 2.17 2.31 2 2.75 3 3.25 3 3.76 4 4.34 4 4.79 5.49 6 6.24 8 8.28 10.22 12.93 F-1 538 50 0.79 1.26 1.60 2.41 3.26 4.05 4.43 5.33 6.43 7.37 8.34 9.01 10.01 10.92 13.90 16.26 19.60 22.61 100 0.84 1.33 1.69 2.58 3.56 4.47 4.94 5.96 7.24 8.22 9.28 10.02 11.09 11.99 15.19 17.59 21.02 24.09 200 0.88 1.40 1.76 2.74 3.85 4.89 5.46 6.62 8.10 9.11 10.26 11.05 12.20 13.09 16.51 18.93 22.42 25.54 500 0.93 1.47 1.84 2.93 4.21 5.44 6.17 7.53 9.30 10.33 1111 ^60 1212 ^47 13.72 14.57 1829.20.70 2424 ^27 27.44 1 1000 0.96 1.52 11.91 13.09 14.51 J 5.9J 6.79 j 8.3� 1� 0.35 1( 1.3011'2.66 1( 3.58 1114.91 � 1�� 1�yJ zI l � zLJ•bb I LI � �� l The upper bound of the confidence interval at 90% confidence level is the value which 5% of the simulated quantile values for a given frequency are greater than. These precipitation frequency estimates are based on a oartial duration series. ARI is the Average Recurrence Interval. Please refer to NOM Atlas 14 Document for more information. NOTE: Formatting prevents estimates near zero to appear as zero. *_ Lower bound of the 90% confidence_interval __ Precipitation Frequency Estimates (inches) ARI ** WF10 min 15 min 30 min 60 min 120 min 3 hr 6 hr Fhr 24 hr 48 hr 4 day 7 day 10 day 20 day 30 day 45 day 60 day 0 0.38 0.60 0.75 1.03 1.29 1.49 L59 1.91 2.26 2.68 3.24 3.10 3.48 4.02 4.61 6.17 7.69 9.90 11.87 0 0.44 0.70 0.89 1.22 1.54 1.79 1.91 2.29 2.71 3.74 4.17 4.80 5.49 7.29 9.04 1 1.61 13.87 0 0.51 0.81 1.03 1.46 1.87 2.2012 .35 2.83 3.35 4.07 4.67 5.15 5.86 6.60 8.62 10.53 13.30 15.70 10 0.56 0.90 1.14 1.65 2.14 2.54 2.74 3.30 3,92 4.72 5.39 5,91 6.69 7.46 9.67 11.66 14.59 17.11 25 0.62 0.98 1.25 1.85 2.46 2.96 3.21 3.89 4.66 5.60 6.36 6.95 7.81 8.62 11.07 13.15 16.25 18.91 Precipitation Frequency Data Server Page 2 of 4 50 110.66 11.05 1.33 2.00 2.71 3.30 3.61 4.39 5.28 6.30 7.12 7.77 8.70 9.53 12.15 14.29 17.50 20.25 100 0.69 1.10 1.39 2.13 2.94 3.62 3.99 4.87 5.90 7.00 7.90 8.60 9.59 10.43 13.23 15.41 18.71 21.53 200 0.72 1.15 1.45 2.25 3.16 3.94 4.39 5.36 6.53 7.73 8.69 9.45 10.50 11.34 14.32 16.52 19.89 22.76 500 0.75 1.19 L50 2.39 3.43 4.34 4.91 6.01 7.38 8.72 9.77 10,59 11,73 12.56 15.79 17.97 21.41 24.36 1000 0.78 1.23 1.54 2.49 3,64 4.67 5.33 6.55 8.09 9.49 10,61 11.48 12,70 13.49 16,91 19.08 22,57 25.53 * The lower bound of the confidence interval at 90% confidence level is the value which 5% of the simulated quantile values for a given frequency are less than. * These precipitation frequency estimates are based on a partial duration maxima series. ARI is the Average Recurrence Interval. Please refer to NOAA Ages 14 Docunwrit for more information. NOTE: Formatting prevents estimates near zero to appear as zero. I Text version of tables I http : / /hdsc. nws. noaa. gov /cgi- binlhdsclbuildout.perl ?type =pf &units =us &series =pd &state... 10/12/2010 Partial duration based Paint Precipitation Frequency Estimates - Version: 3 35.664722 N 78.849167 W 298 Ft 28 27 26 - - - 25 _ 24 ,rlrc -�.. . 23 - - - 22 - -- - - - -; - -- - -- -- -- _., .. .. 21 _ _ _._. - ------ _ .. --- - -- - 24 17 ........ ... ......._ .. _ _... - --- _-...- - v16 _. : - .. -._.. . _. - - ---. 0 14 - _ .. .... -. 13 -.. ...... ...... - -- 12 - _. _ -------- 10 - - - - ------ -� v9 _ ---- - -- - -- - - --- -• - - --- . ..:... . ..... 7 r - _ - - a „- 5 - --. 4 _ - ------ -- -- -• C °` .I 1 r -------------------- 1 t --- - - 1 2 5 10 25 50 100 200 500 1000 Average Recurrence Interval (years) Tue Oct 12 09:15:34 2010 ( duration 5 -min - 30 -min - - 3 -hr 24 -hr 7 -day + 30 -day --a- 10 -min + 60 -min $ 6 -hr 48 -hr $ 10 -day -X- 45 -day Al-- 15 -min 120 -m f 12 -hr -A- 4 -day 20 -day 60 -day http : / /hdsc. nws. noaa. gov /cgi- binlhdsclbuildout.perl ?type =pf &units =us &series =pd &state... 10/12/2010 Precipitation Frequency Data Server Partial duration based Point Precipitation Frequency Estinates - Version: 3 35.664722 N 78.849167 W 298 Ft Average Recurrence Interval ( ears) I i --e-- 2 -+- 5 -)E- 10 CIE 25 50 f 100 — 200 500 -A� 1000 Related Information Maps & Aerials Click here to see topographic maps and aerial photographs available for this location from Microsoft Research Mans Watershed /Streamflow Information Page 3 of 4 Click here to see watershed and streamflow information available for this location from the U.S. Environmental Protection Agency's site Climate Data Sources National Climatic Data Center (NCDC) database Locate NCDC climate stations within: +/ -30 minutes or +/ -1 degree of this location. Digital ASCII data can be obtained directly from NCDC. Note: Precipitation frequency results are based on analysis of precipitation data from a variety of sources, but largely NCDC. The following links provide general information about observing sites in the area, regardless of if their data was used in this study. For detailed information about the stations used in this study, please refer- to the matching documentation available at the PFDocument page US De °artment of Commerce. National Oceanic and Atmoso_ heric Administration National Weather Service Office of Hvdroloaic Development 1325 East West Highway Silver spring, MD 20910 Questions ?: HDSC.QuestionstMnoaa.at2r http: / /hdsc.nws.noaa.gov /cgi- bin /hdsc/buildout.perl? type =pf &units =us &series =pd &state.., 10/12/2010 27 =.. - 26 -- 25 24 22 21 20 - i9 - _ 4 16 - _ - 15 13 - 12 - 10 -- - a $ T - 5 4 J �Vy C C C E L L L L L L L L L M S M M S S M M S S I £ £ £ £ £ £ £ I 1 1 t £ I £ 1 I>S M to 73 0 a IB s IB 16 a s 0 a (6 T a s I I i I IE7 O LLi O 1 'J I N 4 .-I C7 V 40 03 N ca 't e-1 s-1 'O 03 I 11 C7 °.i- Iti ! h I O I 1 lL7 O 1 c7 1 1 li} O on Tue Oct 12 09:15:34 2010 Average Recurrence Interval ( ears) I i --e-- 2 -+- 5 -)E- 10 CIE 25 50 f 100 — 200 500 -A� 1000 Related Information Maps & Aerials Click here to see topographic maps and aerial photographs available for this location from Microsoft Research Mans Watershed /Streamflow Information Page 3 of 4 Click here to see watershed and streamflow information available for this location from the U.S. Environmental Protection Agency's site Climate Data Sources National Climatic Data Center (NCDC) database Locate NCDC climate stations within: +/ -30 minutes or +/ -1 degree of this location. Digital ASCII data can be obtained directly from NCDC. Note: Precipitation frequency results are based on analysis of precipitation data from a variety of sources, but largely NCDC. The following links provide general information about observing sites in the area, regardless of if their data was used in this study. For detailed information about the stations used in this study, please refer- to the matching documentation available at the PFDocument page US De °artment of Commerce. National Oceanic and Atmoso_ heric Administration National Weather Service Office of Hvdroloaic Development 1325 East West Highway Silver spring, MD 20910 Questions ?: HDSC.QuestionstMnoaa.at2r http: / /hdsc.nws.noaa.gov /cgi- bin /hdsc/buildout.perl? type =pf &units =us &series =pd &state.., 10/12/2010 Precipitation Frequency Data Server HVINOPIRR POINT PRECIPITATION A11V FREQUENCY ESTIMATES FROM NOAA ATLAS 14 vo North Carolina 35.664722 N 78.849167 W 298 feet from "Precipitation- Frequency Atlas of the United States" NOAA Atlas 14, Volume 2, Version 3 G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley NOAA, National Weather Service, Silver Spring, Maryland, 2004 Extracted: Thu Sep 15 2011 Confidence Limits Seasonality Related Info (' GIS data 11 Maps � Docs ,.. ... _. . _. - Precipitation ... ...._ _. _ Frequency Estimates (inches) Page 1 of 4 Return to State Map AEP* (1 -in- Y) 5 min 10 min 15 min 30 min 60 min 120 min 3 hr 6 hr 12 hr 24 hr 48 hr 4 day 7 day 10 day 20 day 30 day 45 60 0 0.49 0 0.59 0.78 0.95 0.98 1.20 1.35 1.70 1.69 2.18 2.00 2.61 2.12 2.54 2.78 3.32 2.99 3.94 2 10 25 0.44 0.71 0.54 0.87 0.61 0.97 0.68 1.08 0.89 IF231 1.54 1.81 1.92 2.31 2.72 3.21 3.71 4.12 4.73 I== 2.54 3.06 8.85 11.27 13.45 1.09 1.56 1.99 2.37 2.52 3.03 3.58 4.29 4.92 5.41 6.13 6.89 8.99 10.95 13.72 16.19 1.23 1.37 1.78 2.32 2.02 2.69 2.78 2.99 3.59 4.27 5.04 5.76 6.30 7.09 7.91 10.23 12.31 15.27 17.88 3.27 FT-T4 ?8 5.14 6.04 6.86 7.48 836 9?1 11.81 13.99 17.14 19.91 50 0.72 1.15 1.46 2.20 2.98 3.67 4.02 4.86 5.87 6.81 7.71 8.38 9.34 10.20 13.00 15.23 18.49 21.35 100 0.77 1.22 1.54 2 36 3.25 1.05 1.48 5.14 6.62 7.60 8.57 9.31 10.33 1 1.20 1-1.19 16.-15 19.80 22.73 200 0.80 1.27 1.61 2.50 3.51 4.43 4.96 6.05 7.42 8.41 9.46 10.26 11.35 12.21 15.41 17.68 21.10 24.08 500 0.84 1.34 1.68 2.68 3.84 4.93 5.60 6.88 8.52 9.53 10.68 11.56 12.74 13.58 17.06 19.31 22.79 25.84 1000 0.88 1.38 1.74 2.81 4.11 5.35 6.15 7.59 9.48 10.41 11.64 12.58 13.84 14.64 18.33 20.55 24.07 27.15 * These precipitation frequency estimates are based on an annual mad ima series. AEP is the Annual Exceedance Probability. Please refer to NOAA Atlas 14 Document for more information. NOTE: Formatting forces estimates near zero to appear as zero. * Upper bound of the 90% confidence interval Precipitation Frequency Estimates (inches) IAEP**11 Y) 5 II 10 II 15 I min L3O ' 60 1 min 120 I min 3 hr 1 6 hr 12 II hr 24 11 hr 48 hr I 4 '1 day 7 day I 10 II day 20 day 30 day 45 day I 60 day 0 0.49 0 0.59 0.78 0.95 0.98 1.20 1.35 1.70 1.69 2.18 2.00 2.61 2.12 2.54 2.78 3.32 2.99 3.94 3.46 4.62 4.00 5.30 4.42 5.79 5.06 6.55 5.75 7.34 7.62 9.58 9.41 11.90 11.64 14.49 14.16 17.04 10 0.67 1.06 1.34 1.95 2.54 3.06 3.29 3.93 4.69 5.44 6.21 6.75 7.58 8.42 10.89 13.08 16.11 18.83 25 0.74 1.18 1.49 2.21 2.94 3.60 3.90 4.69 5.62 6.51 7.39 8.01 8.-7-19 .82 12.57 14.88 18.10 20.98 50 0.79 1.26 1.59 2.40 3.25 4.03 4.41 5.31 6.40 7.34 8.31 8.98 9.97 10.87 13.85 16.20 19.53 22.51 100 0.84 1.33 1.68 2.57 3.54 1 Efl 4.92 5.94 7.21 8.19 9.24 9.98 11.04 11.94 15.13 17.52 20.94 23.99 200 0.88 1.39 1.75 2.73 3.83 4.87 5.44 6.60 8.07 9.07 10.22 11.01 12.15 13.04 16.44 18.85 22.33 25.44 500 0.92 1.46 1.84 2.92 Efl 5.42 6.15 7.50 9.26 10.29 11.56 12.42 13.67 14.51 18.22 20.62 24.17 27.33 1000 0.96 1.51 1.90 3.08 4.49 5.88 6.76 8.29 10.31 11.26 12.61 13.52 14.85 15.67 19.61 21.98 25.56 28.73 The upper bound of the confidence interval at 90% confidence level is the value which 5% of the simulated quantile values for a given frequency are greater than. * These precipitation frequency estimates are based on an annual maxima series. AEP is the Annual Exceedance Probability. Please refer to NOAA Atlas 14 Document for more information. NOTE: Formatting Prevents estimates near zero to appear as zero. Y_Lo_wer_ bound- of - the _90 %_ confidence _interval____ - ._ Precipitation Frequency Estimates (inches) 5 10.50 110 .79 111 .00 111 .43 111 .83 112 .15 112 .30 2.76 3.27 3.98 4.56 5.03 5.73 6.45 8.43 10.29 13.00 15.34 10 110.56 10.89 11.12 11.63 2.12 2.52 2.71 3.26 3.88 4.67 L IL 85 6.62 7.39 9.57 11.55 14.45 16.94 25 110.61 0.98 1124 1.84 2.45 2.95 3.20 3.87 4.64 5.58 6.33 6.92 7.78 8.59 11.02 13.10 16.19118 83 50 0.66 1.32 1.99 2.70 3.29 3.60 LIZJ15 .26 116 117 .09 117 .74 11866 9.49 12.10 14.23 17.43 20.16 http: / /dipper.nws.noaa. gov /cgi- bin/hdsc /buildout.perl ?type =pf &units =us &series =am &state... 9/15/2011 Precipitation Frequency Data Server Page 2 of 4 100 110.69 200 500 1.10 1.39 EE 1.49 1.53 L 2.24 2.38 2.48 2.93 3.14 3.41 EE] 3.61 3.92 4.33 3.98 4.37 4.89 5.31 4.85 5.34 JEE 5.99 6.53 5.87 7.35 8.06 6.98 7.87 8.56 9.55 10.39 13.18 15.35 18.64 21.44 0.72 0.75 0.77 1.14 1.19 1.22 7.70 8.69 9.45 8.66 9.73 10.56 9.41 10.55 11.44 10.46 11.69 12.64 11.29 12.51 13.44 14.26 15.73 16.85 16.45 17.90 19.00 19.81 21.33 22.48 22.67 24.26 25.43 1000 The lower bound of the confidence interval at 90% confidence level is the value which b% of the simulated quantue values Tor a given Trequency, are less man. " These precipitation frequency estimates are based on an annual maxima series. AEP is the Annual Exceedance Probability. Please refer to NOAA Atlas 14 Document for more information. NOTE: Formatting prevents estimates near zero to appear as zero. Text version of tables Annual Maxima based Point Precipitation Frequency Estimates - Version: 3 35.664722 N 78.849167 W 298 ft 28 , 27 - 26 - 25 24 - 23 - 22 - 20 - 19 - - 18 - ag, 16 - ° 15 - - c 13-- R 12 a 10 (U, 9f�".... - - 3 -^-"- - 2 5 10 Thu Sep 15 13:54:38 2011 Duration 5 -min - 30 -min 3 -hr -#-- 24 -hr 10 -min -+- 60 -min -E3- 6 -hr 48 -hr 15 -min 120 -m -i- 12 -hr -A- 4 -day -,r 25 50 100 200 500 1000 Annual Exceedance Probability (1 -in -Y} 7 -day --I 30 -day -B 10 -day --i- 45 -day -t 20 -day 60 -day -�- http://dipper.nws.noaa.gov/cgi-bin/hdse/buildout.p I erl?type=pf&units=us&series=am&state... 9/15/2011 Precipitation Frequency Data Server 28 27 26 25 24 23 22 21 c 20 Z: 19 18 17 v 16 ° 15 0 14 13 12 11 10 v 9 a 8 7 6 5 4 3 2 1 0 C C 1= C E E In o In o Thu Sep 15 13:54:38 2011 Annual Maxima based Point Precipitation Frequency Estimates - ~Version: 3 35.664722 N 78.849167 W 298 Ft � C ^c L L L L L L � L 31 5i S 71 S T 31 S S 11 1 I N A St 5D M N 90 d' lD co I 11 1 I I I I I I O 0 rl r4 ai CV M V A tt IC7 h a In O O 0 O M Duration rl 14 " °o v ° Annual Exceedance Probability (1 -in -Y) 1 in 2 1 in 10= 1 in 50 -9 1 in 200 1 in 1000 1 in 5 1 to 25 -e- 1 in 100 — 1 in 500 -�- Related Information Maps & Aerials Click here to see topographic maps and aerial photographs available for this location from Microsoft Research Mans Watershed /Streamflow Information Page 3 of 4 Click here to see watershed and streamflow information available for this location from the U.S. Environmental Protection Agency's site Climate Data Sources National Climatic Data Center (NCDC) database Locate NCDC climate stations within: 1 +/ -30 minutes 1 or +/ -1 degree l of this location. Digital ASCII data can be obtained directly from NCDC. Note: Precipitation frequency results are based on analysis of precipitation data from a variety of sources, but largely NCDC. The following linlzs provide general information about observing sites in the area, regardless of if their data was used in this study. For detailed information about the stations used in this study, please refer- to the matching documentation available at the PF Document page US Department of Commerce National Oceanic and Atmosoheric Administration National Weather Service Office of Hvdroloaic Development 1325 East West Highway http: / /dipper.nws.noaa. gov /cgi- binlhdsc /buildout.perl ?type =pf &units =us &series =am &state... 9/15/2011 Precipitation Frequency Data Server Page 4 of 4 Silver Spring, MD 20910 Questions ?: HDSC.Questionsna.noaa.00v Disclaimer http: // dipper. nws. noaa .gov /cgi- binlhdsc /buildout.perl ?type =pf &units =us &series =am &state... 9/15/2011 Center Weighted Storm Computation - Based on NOAH Atlas 14 Results Copy input data from NOAA Atlas 14: 1) Have NOAA Atlas 14 results in Internet Explorer Window 2) Copy from ARI of one year to 1000 year, 60 day precipitation value. Do not include column headings, "1" will be in upper left of selection, 1000 -yr; 60 -day result in lower right of selection. 3) Paste with starting point at ARI of I year (first cell in the ARI column, cell Al2). Cannot paste special to preserve format, format is via macro in next step 4) Place cursor on ARI of 1 year (cell Al2), and press CTRL +f for fonnat - make sure that A 12 is the only cell selected before running the format macro. 5) Copy results of output data (below rainfall input) into PondPack ARI 5 10 15 30 60 120 3 6 12 24 48 4 7 10 20 30 45 60 (years) min min min_ min min min hours hours hours hours hours days _ days days _ days days days days 1 0.41 0.66 0.82 1.13 1.41 1.64 1.74 2.09 2.46 2.89 3.35 3.73 4.3 4.92 6.57 8,17 10.43 12.5 2 0.48 0.77 0.97 ! 1.34 1.68 1.97 2.09 2.5 2.95 3.48 4.03 4.47 5.13 5.86 7.77 9.62 12.24 14.61 5 0.55 0.89 1.12 1.59 2.04 2.42 2.58 3.1 3.67 4.38 5.03 5.53 6.27 7.05 9.2 11.2 14.04 16,56 10 0.61 0.98 1.24 1.8 2.35 2.81 3.02 3.62 4.31 5.09 5.82 6.36 7.16 7.99 10.33 12.43 15.42 18.06 25 0.68 1.08 1.37 2.02 2.69 3.27 3.55 4.28 5.14 6.04 6.86 7.48 8.36 9.21 11.81 13.99 17.14 19.91. 50 0.72 1.15 1.46 2.2 2.98 3.67 4.02 4.86 5.87 6.81 7.71 8.38 9.34 10.2 13 15.23 18.49 21.35 100 0.77 1.22 1.54 2.36 3.25 4.05 4.48 5.44 6.62 7.6 8.57 9.31 10.33 11.2 14.19 16.45 19.8 22.73 200 0.8 1.27 1.61 2.5 3.51 4.43 4.96 6.05 7.42 8.41 9.46 10.26 11.35 12.21 15.41 17.68 21.1 24.08 500 0.84 1.34 1.68 2.68 3.84 4.93 , 5.6 6.88 8.52 9.53 10.68 11.56 12.74 13.58 17.06 19.31 22.79 25.84 1000 0.88 1.38 1.74 2.81 4.11 5.35 6.15 7.59 9.48 10.41 11.64 12.58 13.84 14.64 18.33 20.55 24.07 27.15 Output Data to Export to PondPack, 5 minute intervals Time Time 1 year 2 year 5 year 10 year 25 year 50 year 100 year 500 year (min) (hours) (min) (min) (min) (min) (min) (min) (min) (min) 0 0.000 0.000 0.000 0.000 0.000 0.000 0 000 0 000 0_000 -. ___._...� _ Cumulative Rainfall Distribution 5 0.083 0.003 0.004 0.005 0.005 0.006 0.007 0.007 0.007 44.44..._ _._._. 10 0.167 0006 0007 0.010 0.011 - 0013 0013 0014 0.014 4..44.4._ �._ _ 12.000 15 0.250 0 009 0 011 0.015 0.016 0.019 0 020 0 020 0.021 444.4_. _. ..��._.�__,__ _ _-_ 20 0.333 0.012 0 015 0.020 0.022 0.025 0 026 0 027 0.028 r, -i 1 year storm _ _.. L __._ 2 ._ 25 0.417 0 015 0.013 0.025 0.0 27 0 031 0 033 0 034 0.035 10.000 '�' 2 year storm _- _ - -- 30 0.500 0.018 0.022 0 030 0.032 0.038 0 039 0 041 0.042 5 year storm ___.. 4..4.44_. 4444_ _. _. __. 35 -0.583 0.021 0.026 _ 0.035 0.038 0.044 0.046 0 048 0.049 r' 10 year storm 40 0.667 0.024 0.029 0.039 0.043 0.050 0 052 0 054 0.056 g 000 -- n 25 year storm -. --. .. ...._.,._.._._.._._._.,_.___.._ __..,._.....�_.- .._...... _._...- .._V,__._._. - i- SOyearstorm 45 0.750 0.0 7 0 033 0.044 0 049 0 056 0 059 0.061 0.063 a^ .....___.._.__._...,._.._.�._._ 44...4..4 _... _.._._. _ . -.. __... 4444.._.. -4444. _....._ .. a -r- 100 year storm 50 0.833 0.030 0 037 0 049 0.054 0 063 0 065 0.068 0.070 0 --- 500 year storm -- -.._ 55 0.917 0.033 0 040 0.054 0.060 0.069 0.072 0.075 0.077 ° 6.000 --- - ut `._.. '_._4444_.,_-_..._____. - 60 1.000 0.036 0.044 0.059 0.065 0.075 0.078 0.082 0.084 ^° ... _ _ 65 1.083 0.039 0.048 0 064 0 070 0.081 0.085 0.088 0.091 _ .._ . 70 1.167 0.042 0.052 0.069 0.076 0.088 0.091 0.095 0.098 4.000 -- __. _. _ _.. 75 1.250 0.045 0.055 0.074 0.081 0 094 0.098 0.102 0.105 A 80 1.333 0 048 0.059 0 079 0.087 0 100 0 104 0 109_ 0.112 w _ _._.._. _. _ --- _. 2000 , 85 1.417 0.051 0.063 0.084 0.092 0.106 0.111 0.116 0.119 _. _ . .... _ , __.... -.. - -- -- _ 90 1.500 0.054 0.066 0 089 0.097 0.113 0 118 0.123 0.126 ._..�__ .__. .__ _ _ 4.444_._. - 95 1 583 0.057 0 070 0 094 0 103 0.119 0 124 0 129 0.133 0.000 # r 4444.. _ ._ _..._. _ . _. _. 100 1.667 0.060 0.074 0.099 0.108 0:125 0.131 0.1.36 0.140 4.4.4...4 __.. 4.444 -_. 0.114 .1.31 0.000 4.000 8.000 12.000 16.000 20.000 24.000 105 1.750 0.063 0 077 0.104 0.114 0. 131 _ 0 137 0 143 .0.147 -- 1144 . _._ -- -. 4141. _ - 110 1.833 07066 0.081 0.108 0.119 0.138 0,144 0.150 0.154 Time (Hours) 115 1.917 0.069 0.085 0.113 0.125 0.144 0.150 0.157 0.161 _ . _ - .. ___ - __. � __ �__ 1414 - .. _ _ -- 120 2.000 0.072 0.088 0.118 0.130 0.150 0.157 0.163 0.168 _ --_ -- ._ -_ 125 2.083 0.075 0.092 0.123 0.135 0.156 0.163 0.170 0.175 Output Data to Export to PondPack, 5 mina a intervals Time Time 1 year 2 year 5 year 10 year 25 year 50 year 100 year 500 year (min) (hours) (min) (min) (min) (min) (min) (min) (min) (min) 130 2.167 0.078 0.096 0.128 0.141 0.163 0.170 0.177 0.182 135 2.250 0.081 0.099 0.133 0.146 _0.169 0.176 0.184 0.189_ 140 2.333 0.084 0.103 0.138 0.152 0.175 0.183 0.191 0.196 145 2.417 0.087 0.107 0.143 0.157 0.181 0.189 0.197 0.203 150 2.500 0.090 0.110 0.148 0.162 0.188 0.196 0.204 0.210 155 2.583 0.093 0.114 0.153 0.168 0.194 0.202 0.211 0.217 160 2.667 0.096 0.118 0.158 0.173 0.200 0.209 0.218 _0.224 165 2.750 0.099 0.121 0.163 0.179 0.206 0.215 0.225 0.231 170 2.833 0.102 0.125 0.168 0.184 0.213 0.222 0.231 0.238 175 2.917 0.105 0.129 0.173 0.190 0.219 0.228 0.238 0.245 180 3.000 0.108 0.133 0.178 0.195 0.225 0.235 0.245 0.253 185 3.083 0.110 0.136 0.182 0.200 0.231 0.242 0.252 0.260 190 3.167 0.113 0.140 0.187 0.206 0.238 0.248 0.259 0.267 195 1250 0.116 0.144 0.192 0.211 0.244 0.255 0.265 0.274 200 3.333 0.119 0.147 0.197 0.217 0.250 0.261 0.272_ 0.281 205 3.417 0.122 0.151 0.202 0.222 0.256 0.268 _ 0.2790.288 210 3.500 0.125 0.155 0207 0.228 0.263 0.274 0.286 0.295 215 3.583 0.128 0.158 0.212 0.233 0.269 0.281 0.293 0.302 220 3.667 0.131 0.162 0.217 0.238 0.275 0.287 0.299 0.309 225 3.750 0.134 0.166 0.222 0.244 0.281 0.294 0.306 0.316 230 3.833 0.137 0.169 0.227 0.249 0.288 0.300 0.313 0.323 235 3.917 0.140 0.173 0.232 0.255 0.294 0.307 0.320 0.330 240 4.000 0.143 0.177 0.237 0.260 0.300 0.313 0.327 0.337 245 4.083 0.146 0.180 0.242 0.265 0.306 0.320 0.333 0.344 250 4.167 0.149 0.184 0.247 0.271 0.313 0.326 0.340 0.351 255 4.250 0.152 0.188 0.251 0.2_76 0.319 0.333 0.347 0.358 260 4.333 0.155 0.191 0.256 0.282 0.325 _0.339 0.354 0.365 265 4.417 0.158 0.195 0.261 0.287 0.331 0.346 0.361 270 4.500 0.161 0.199 0.266 0.292 0.338 0.353 0.36_7 _0.372 0.37_9 275 4.583 0.164 0.202 0.271 0.298 0.344 0.359 0.374 0.386 280 4.667 0.167 0.206 0.276 0.303 0.350 0.366 0.381 0.393 285 4.750 0.170 0.210 0.281 0.309 0.356 0.372 0.388 0.400 290 4.833 0.173 0.213 0.286 0.314 0.363 0.379 0.395 0.407 295 4.917 0.176 0.217 0.291 0.320 0.369 0.385 0.402 0.414 300 5.000 0.179 0.221 0.296 _0.325 0.375 0.392 0.408 0.421 305 5.083 0.182 0.225 0.301 0.330 0.381 0.398 0.415 0.42_8 310 5.167 0.185 0.228 0.306 0.336 0.388 0.405 0.422 0.435 315 5.250 0.188 0.232 0.311 0.341 0.394 0.411 0.429 0.442 320 5.333 0.191 0.236 0.316 0.347 0.400 0.418 0.436 0.449 325 5.417 0.194 0.239 0.320 0.352 0.406 0.424 0.442 0.456 330 5.500 0.197 0.243 0.325 0.357 0.413 0.431 0.449 0.463 335 5.583 0.200 0.247 0.330 0.363 0.419 0.437 0.456 0.470_ 340 5.667 0.203 0.250 0.335 0.368 0.425 0.444 0.463 0.477 345 5.750 0.206 0.254 0.340 0.374 0.431 0.450 0.470 0.484 350 5.833 0.209 0.258 0.345 0.379 0.438 0.457 0.476 0.491 355 5.917 0.212 0.261 0.350 0.385 0.444 0.463 0.483 0.498 360 6.000 0.215 0.265 0.355 0.390 0.450 0.470 0.490 0.505 365 6.083 0.220 0.271 0.363 0.400 0.462 0.484 0.506 0.528_ 370 6.167 0.225 0.278 0.371 0.409 0.474 0.498 0.523 0.551 Output Data to Export to PoudPack, 5 minute intervals Time (min) 375 380 385 390 395 400 405 410 415 420 425 430 435 440 445 450 455 460 465 470 475 480 485 490 495 500 505 510 515 520 525 530 535 540 545 550 555 560 565 570 575 580 585 590 595 600 605 610 615 Time I year (hours) (min) 6.250 0.230 6.333 0.236 6:417 0.241 6.500 0.246 6.583 0.251 6.667 0.256 6.750 0.261 6.833 0.266 6.917 0.272 7.000 0.277 7.083 0.282 7.167 0.287 7.250 0.292 7.333 0.297 7.417 0.302 7.500 0.308 7.583 0.313 7.667 0.318 7.750 0.323 7.833 0.328 7.917 0.333 8.000 0.338 8.083 0.343 8.167 0.349 8.250 0.354 8.333 0.359 8.417 0.364 8.500 0.369 8.583 0.374 8.667 0.379 8.750 0.385 8.833 0.390 8.917 0.395 9.000 0.400 9.083 0.410 9.167 0.419 9.250 0.429 9.333 0.439 9.417 0.449 9.500 0.458 9.583 0.468 9.667 0.478 9.750 0.487 9.833 0.497 9.917 0.507 10.000 0.517 10.083 0.526 10.167 0.536 10.250 0.546 2 year 5 year 10 year 25 year 50 year 100 year 500 year (min) (min) (min) (min) (min) (min) (min) 0.284 0.379 0.419 0.486 0.512 0.539 0.573 0.290 0.387 0.428 0.498 0.526 0.556 0.596 0.296 0.395 0.438 0.510 0.540 0.572 0.619 0.303 0.403 0.448 0.522 0.554 0.588 0.642 0.309 0.410 0.457 0.534 0.568 0.605 0.664 0.315 0.418 0.467 0.546 0.582 0.621 0.687 0.321 0.426 0.476 0.558 0.596 0.637 0.710 0.328 0.434 0.486 u 0.569 0.610 0.654 0.733 0.334 0.442 0.495 0.581 0.624 0.670 0.756 0.340 0.450 0.505 0.593 0.638 0.687 0.778 0.346 0.458 0.515 0.605 0.652 0.703 0.801 0.353 0.466 0.524 0.617 0.666 0.719 0.824 0.359 0.474 0.534 0.629 i 0.680 0.736 0.847 0.365 0.482 0.543 0.641 0.694 0.752 0.869 0.371 0.490 0.553 0.653 0.708 0.769 0.892 0.378 0.498 0.563 0.665 0.723 0.785 0.915 0.384 0.505 0.572 0.677 0.737 0.801 0.938 0.390 0.513 0.582 0.689 0.751 0.818 0.961 0.396 0.521 0.591 0.701 0.765 0.834 0.983 0.403 0.529 0.601 0.713 0.779 0.851 1.006 0.409 0.537 0.610 0.725 0.793 0.867 _1.029 0.415 0.545 0.620 0.737 _0.807 0.883 1.052 0.421 0.553 0.630 0._749 0.821 0.900 1.074 0.428 0.561 0.639 0.761 0.835 0.916 1.097 0.434 0.569 0.649 0.772 0.849 0.932 1.120 0.440 0.577 0.658 0.784 0.863 0.949 1.143 0.446 0.585 0.668 0.796 0.877 0.965 1.166 0.453 0.593 0.678 0.808 0.891 0.982 1.188 0.459 0.600 0.687 0.820 0.905 0.998 1.211 0.465 0.608 0.697 0.832 0.919 1.014 1.234 0.471 .0.616 0.706 0.844 0.933 1.031 1.257 0.478 0,624 0.716 0.856 0.947 1.047 1.279 0.484 0.632 0.725 0.868 0.961 1.064 1.302 0.490 0.640 0.735 0.880 0.975 1.080 1.325 0.501 0.654 0.752 0.900 0.998 1.107 1.361 0,513 0.669 0.768 0.921 1.022 1.133 1.396 0.524 0.683 0.785 0.941 1.045 1.160 1.432 0.536 0.698 0.802 0,961 1.068 1.187 1,467 0.547 0.712 0.818 0.981 1.092 1.213 1.503 0.558 0.727 0.835 1.002 1.115 1.240 1.538 0.570 0.741 0.852 1.022 1.138 1.267 1.574 0.581 0.756 0.868 1.042 1.162 1.293 1.609 0.593 0.770 0.885 1.063 1.185 1.320 1.645 0.604 0.784 0.902 1.083 1.208 1.347 1.681 0.615 0.799 0.918 1.103 1.232 1.373 1.716 0.627 0.813 0.935 1.123 1.255 1.400 1.752 0.638 0.828 0.952 1.144 1.278 1.427 1.787 0.649 0.842 0.968 1.164 1.302 1.453 1.823 0.661 0.857 0.985 1.184 1.325 1.480 1.858 Output Data to Export to Pond] Time Time 1 year (min) (hours) (min) 620 10.333 0.556 625 10.417 0.565 630 10.500 0.575 635 10.583 0.583 640 10.667 0.592 645 10.750 0.600 650 10.833 0.608 655 10.917 0.617 660 11.000 0.625 665 11.083 0.644 670 11.167 0.663 675 11.250 0.682 680 11.333 0.702 685 11.417 0.721 690 11.500 0.740 695 11.583 0.806 700 11.667 0.871 705 11.750 0.937 710 11.833 1.002 715 11.917 1.207 720 12.000 1.617 725 12.083 1.822 730 12.167 1.888 735 12.250 1.953 740 12.333 2.019 745 12.417 2.084 750 12.500 2.150 755 12.583 2.169 760 12.667 2.188 765 12.750 2.208 770 12.833 2.227 775 12.917 2.246 780 13.000 2.265 785 13.083 2.273 790 13.167 2.282 795 13.250 2.290 800 13.333 2.298 _ 805 13.417 2.307 810 13.500 2.315 815 13.583 2.325 820 13.667 2.334 825 13.750 2.344 830 13.833 2.354 835 13.917 2.364 840 14.000 2.373 845 14.083 2.383 850 14.167 2.393 855 14.250 2.403 860 14.333 2.412 'ack, 5 minu to intervals 2 year 5 year 10 year (min) (min) (min) 0.672 0.871 1.002 0.684 0.886 1.018 0.695 0.900 1.035 0.705 0.913 1.053 0.715 0.927 1.070 0.725 0.940 1.088 0.735 0.953 1.105 0.745 0.967 1.123 0.755 0.980 1.140 0.779 1.012 1.178 0.803 1.043 1.217 0.828 1.075 1.255 0.852 1.107 1.293 0.876 1.138 1.332 0.900 1.170 1.370 0.979 1.272 1.493 1.058 1.374 1.617 1.137 1.477 1.740 1.216 1.579 1.863 1.461 1.864 2.178 1.941 2.414 2.788 2.186 2.699 3.103 2.264 2.801 3.227 2.343 2.903 3.350 2.422 3.006 3.473 2.501 3.108 3.597 2.580 3.210 3.720 1604 3.242 3.758 2.628 3.273 3.797 2.653 3.305 3.835 2.677 1 3.337 3.873 2.701 3.368 3.912 2.725 3.400 1950 2.735 3.413 3.968 2.745 3.427 3.985 2.755 3.440 4.003 2.765 3.453 4.020 2.775 3.467 4.038 2.785 3.480 4.055 2.796 3.494 4.072 2.808 3.509 4.088 2.819 3.523 4.105 1831 3.538 4.122 2.842 3.552 4.138 2.853 3.567 4.155 2.865 3.581 4.172 2.876 3.596 4.188 2.888 3.610 4.205 2.899 3.624 4.222 25 year (min) 1.204 1.225 1.245 _ 1.268 1.292 1.315 1.338 1.362 1.385 1.433 1.482 1.530 1.578 1.627 1.675 1.822 1.968 2.115 2262 2.607 3.287 3.632 3.778 3.925 4.072 4.218 4.365 4.413 4.462 4.510 4.558 4.607 4.655 4.678 4.702 4.725 4.748 4.772 4.795 4.815 4.836 4.856 4.876 4.896 4.917 4.937 4.957 4.978 4.998 50 year 100 year 500 year (min) (min) (min) 1.348 1.507 1.894 1.372 1.533 _1.929 1.395 1.560 1.965 1.424 1.596 2.021 _ 1.453 1.632 2.077 Y1.483 1.668 2.133 1.512 1.703 2.188 _ 1.541 1.739 2.244 1.570_ 1.775 2.300 1.628 _ 1.842 2.391 1.685 1.908 2.482 1.743 1.975 _ 2.573 1.800 2.042 2.663 1.858 2.108 2.754 1.915 2.175 2.845 2.084 2.365 3.085 2.253 2.555 3.325 2.422 2.745 3.565 2.591 2.935 3.805 2.961 3.320 4.225 3.681 4.090 5.065 4.051 4.475 5.485 4.219 4.665 5.725 4.388 4.855 5.965 4.557 5.045 6.205 4.726 5.235 6.445 4.895 5.425 6.685 4.953 5.492 6.776 5.010 5.558 6.867 5.068 5.625 6.958 5.125 5.692 7.048 5.183 5.758 _ 7.139 5.240 5.825 `7.230 5.269 5.861 7.286 5.298 5.897 7.342 5.328 _ 5.932 7.398 5.357 5.968 7.453 5.386 6.004 7.509 5.415_ 6.040_ 7.565 5.438 6.067 7.601 5.462 6.093 7.636 5.485 6.120 7.672 5.508 6.147 7.707 5.532 6.173 7.743 5.555 6.200 7.778 5.578 6.227 7.814 5.602 6.253 7.849 5.625 6.280 7.885 5.648 6.307 7.921 Output Data to Export to PondPack, 5 mina a intervals Time Time 1 year (min) (hours) (min) 865 14.417 2.422 870 14.500 2.432 875 14.583 2.441 880 14.667 2.451 885 14.750 2.461 890 14.833 2.471 895 14.917 2.480 900 15.000 2.490 905 15.083 2.495 910 15.167 2.500 915 15.250 2.505 920 15.333 2.511 925 15.417 2.516 930 15.500 2.521 935 15.583 2.526 940 15.667 2.531 945 15.750 2.536 950 15.833 2.541 955 15.917 2.547 960 16.000 2.552 965 16.083 2.557 970 16.167 2.562 975 16.250 2.567 980 16.333 2.572 985 16.417 2.577 990 16.500 2.583 995 16.583 2.588 1000 16.667 2.593 1005 16.750 2.598 1010 16.833 2.603 1015 16.917 2.608 1020 17.000 2.613 1025 17.083 1618 1030 17.167 2.624 1035 17.250 2.629 1040 17.333 2.634 1045 17.417 2.639 1050 17.500 2.644 1055 17.583 2.649 1060 17.667 2.654 1065 17.750 2.660 1070 17.833 2.665 1075 17.917 2.670 1080 18.000 2.675 1085 18.083 2.678 1090 18.167 2.681 1095 18.250 2.684 1100 18.333 2.687 1105 18.417 2.690 2 year (min) 2.910 2.922 2.933 2.944 2.956 2.967 2.979 2.990 2.996 3.003 mm 3.009 3.015 3.021 3.028 3.034 3.040 3.046 3.053 3.059 3.065 3.071 3.078 3.084 3.090 3.096 3.103 3.109 3.115 3.121 3.128 3.134 3.140 3.146 3.153 3.159 3.165 3.171 3.178 3.184 3.190 3.196 3.203 3.209 3.215 3.219 3.222 3.226 3.230 3.233 5 year (min) 3.639 3.653 3.668 3.682 3.697 3.711 3.726 3.740 3.748 3.756 3.764 3.772 3.780 3.788 3.795 3.803 3.811 3.819 3.827 3.835 3.843 3.851 3.859 3.867 3.875 �T3.883 3.890 3.898 3.906 3.914 3.922 3.930 3.938 3.946 3.954 3.962 3.970 3.978 3.985 3.993 4.001 4.009 4.017 4.025 4.030 4.035 4.040 4.045 4.050 10 year 25 year (min) (min) 4.238 5.018 4.255 5.038 4.272 5.059 4.288 5.079 4.305 5.099 4.322 5.119 4.338 5.140 4.355 5.160 4.365 5.172 4.374 5.184 4.384 5.196 4.393 5.208 4.403 5.220 4.413 5.232 4.422 5.244 4.432 5.256 4.441 5.268 4.451 5.279 4.460 5.291 4.470 5.303 4.480 5.315 4.489 5.327 4.499 5.339 4.508 5.351 4.518 5.363 4.528 5.375 4.537 5.387 4.547 5.399 4.556 5.411 4.566 5.423 4.575 5.435 4.585 5.447 4.595 5.459 4.604 5.471 4.614 5.483 4.623 5.494 4.633 5.506 4.643 5518 4.652 5.530 4.662 5.542 4.671 5.554 4.681 5.566 4.690 5.578 4.700 5.590 4.705 5.596 4.711 5.603 4.716 5.609 4.722 5.615 4.727 5.621 50 year 100 year 500 year (min) (min) (min) 5.672 6.333 7.956 5.695 6.360 7.992 5.718 6.387 8.027 5.742 6.413 8.063 5.765 6.440 8.098 _5.788 6.467 8.134 5.812 6.493 8.169 5.835 6.520 8.205 5.849 6.536 8.228 5.863 6.553 8.251 5.877 6.569 8.273 5.891 6.586 8.296 5.905 6.602 8.319 5.919 6.618 8.342 5.933 _ 6._635 8.364 _5.947 6.651 8.387 5.961 6.667 8.410 5.975 6.684 8.433 5.989 6.700 8.456 6.003 6.717 8.478 6.017 _6.733 8.501 6.031 6.749 8.524 6.045 6.766 8.547 6.059 6.782 8.569 6.073 6.799 8.592 6.088 6.815 8.615 6.102 6.831 8.638 6.116 6.848^ 8.661 6.130 8.683 6.144 6.881 8.706 6.158 6.897 8.729 6.172 6.913 8.752 6.186 6.930 8.774 6.200 6.946 8.797 6.214 6.962 8.820 6.228 6.979 8.843 6.242_ 6.995 8.866 6.256 7.012 8.888 _6.270 7.028 8.911 6.284 7.044 8.934 6.298 7.061 8.957 6.312 7.077 8.979 6.326 7.094 9.002 _6.340 7.110 9.025 6.347 7.117 9.032 6.353 7.124 9.039 6.360 7.130 9.046 6.366 7.137 9.053 6.373 7.144 9.060 Output Data to Export to PondPack, 5 minu to intervals Time Time 1 year (min) (hours) (min) 1110 18.500 2.693 1115 18.583 2.696 1120 18.667 2.699 1125 18.750 2.702 1130 18.833 2.705 1135 18.917 2.708 1140 19.000 2.711 1145 19.083 2.714 1150 19.167 2.717 1155 19.250 2.720 1160 19.333 2.723 1165 19.417 2.726 1170 19.500 2.729 1175 19.583 2.732 1180 19.667 2.735 1185 19.750 2.738 1190 19.833 2.741 1195 19.917 2.744 1200 20.000 2.747 1205 20.083 2.750 1210 20.167 2.753 1215 20.250 2.756 1220 20.333 2,759 1225 20.417 2.762 1230 20.500 2.765 1235 20.583 2,768 1240 20.667 2.771 1245 20.750 2.774 1250 20.833 2.777 1255 20.917 2.780 1260 21.000 2.783 1265 21.083 2.785 1270 21.167 2.788 1275 21.250 2.791 1280 21.333 2.794 1285 21.417 2.797 1290 21.500 2.800 1295 21.583 2.803 1300 21.667 2.806 1305 21.750 2.809 1310 21.833 2.812 1315 21.917 2.815 1320 22.000 2.818 1325 22.083 2.821 1330 22.167 2.824 1335 22.250 2.827 1340 22.333 2.830 1345 22.417 2.833 1350 22.500 2.836 2 year (min) 3.237 3.241 3.244 3.248 3.252 3.255 3.259 3.263 3.267 3.270 3.274 3.278 3.281 3.285 3.289 3.292 3.296 3.300 3.303 3.307 3.311 3.314 3.318 3.322 3.325 3.329 3.333 3.336 3.340 3.344 3.348 3.351 3.355 3.359 3.362 3.366 3.370 3.373 3.377 3.381 3.384 3.388 3.392 3.395 3.399 3.403 3.406 3.410 3.414 5 year (min) 4.055 4.060 4.064 4.069 4.074 4.079 4.084 4.089 4.094 4.099 4.104 4.109 4.114 4.119 4.124 4.129 4.133 4.138 4.143 4.148 4.153 4.158 4.163 4.168 4.173 4.178 4.183 4.188 4.193 4.198 4,202 4.207 4.212 4.217 4.222 4.227 4.232 4.237 4.242 4.247 4.252 4.257 4.262 4.267 4.272 4.276 4.281 4.286 4.291 10 year 25 year (min) (min) 4.733 5.628 4.738 5.634 4.743 5.640 4.749 5.646 4.754 5.653 4.760 5.659 4.765 5.665 4.770 5.671 4.776 5.678 4.781 544 4.787 5.690 4.792 5.696 4.798 5.703 4.803 5.709 4.808 5.715 4.814 5.721 4.819 5.728 4.825 5.734 4.830 5.740 4.835 5.746 4.841 5.753 4.846 5.759 4.852 5.765 4.857 5.771 4.863 5.778 4.868 5.784 4.873 5.790 4.879 5.796 4.884 5.803 4.890 5.809 4.895 5.815 4.900 5.821 4.906 5.828 4.911 5.834 4.917 5.840 4.922 5.846 4.928 5.853 4.933 5.859 4.938 5.865 4.944 5.871 4.949 5.878 4.955 5.884 4.960 5.890 4.965 5.896 4.971 5.903 4.976 5.909 4.982 5.915 4.987 5.921 4.993 5.928 50 year 100 year 500 year (min) (min) (min) 6.379 7.151 9.067 6.386 7.158 9.074 6.392 7.164 9.081 6.399 7.171 9.088 6.405 7.178 9.095 6.412 7.185 9.102 6.418 7.192 9.109 _6.425 7.198 9.116 _ 6.431 7.205 9.123 6.438 7.212 9.130 6.444 7.219 9.137 6.451 7.226 9.144 6.458 7.233 9.151 6.464 7.239 9.158 6.471 7.246 9.165 6.477 7.253 9.172 6.484 7.260 9.179 6.490 7.267 9.186 6.497 7.273 9.193 6.503 7.280 9.200 6.510 7.287 9.207 6.516 7.294 9.214 6.523 7.301 9.221 6.529 7.307 9.228 6.536 7.314 9.235 6.542 7.321 9.242 6.549 7.328 9.249 6.555 7.335 9.256 6.562 7.341 9.263 6.568 7.348 9.270 6.575 7.355 9.278 6.582 7.362 9.285 6.588 7369 9.292 6.595 7.375 9.299 6.601 7.382 9.306 6.608 7.389 9.313 6.614 7.396 9.320 6.621 7.403 9.327 6.627 7.409 9.334 6.634 7.416 9.341 6.640 7,423 6.647 7.430 9.355 6.653 7.437 9.362 6.660 7.443 9.369 6.666 7.450 9.376 6.673 7.457 9.383 6.679 7.464 9.390 6.686 7.471 9.397 6.693 7.478 9.404 Output Data to Export to PoudPack, 5 minute intervals Time Time 1 year 2 year 5 year 10 year 25 year 50 year 100 year 500 year (min) (hours) (min) (min) (min) (min) (min) (min) (min) (min) 1355 22.583 2.839 3.417 4.296 4.998 5.934 6.699 7.484 9.411 1360 22.667 2.842 3.421 4.301 5.003 5.940 6.706 7.491 9.418 1365 22.750 2.845 3.425 4.306 5.009 5.946 6.712 7.498 9.425 1370 22.833 2.848 3.428 4.311 5.014 5.953 6.719 7.505 9.432 _ 137_5 22.917 2.851 3.432 4.316 5.020_ 5.959 6.725 7.512 9.439 1380 23.000 2.$54 3.436 4.321 5.025 5.965 6.732 7.518 9.446 1385 23.083 2.857 3.440 4.326 5.030 5.971 6.738 7.525 9.453 1390 23.167 2.860 3.443 4.331 5.036_5.978 6.745 7.532 9.460 1395 23.250 2.863 3.447 4.336 5.041 5.984 6.751 7.539 9.467 1400 23.333 2.866 3.451 4.341 5.047 5.990 6.758 7.546 9.474 1405 23.417 2.869 3.454 4.345 5.052 5.996 6.764 7.552 9.481 1410 23.500 2.872 3.458 4.350 5.058 6.003 6.771 7.559 9.488 1415 23.583 2.875 3.462 4.355 5.063 6.009 6.777 7.566 9.495 1420 23.667 2.878 3.465 1 4.360 5.068 6.015 6.784 7.573 9.502 1425 23.750 2.881 3.469 4.365 5.074 6.021 6.790 7.580 9.509 1430 23.833 2.884 3.473 4.370 5.079 6.028 6.797 7.586 9.516 1435 23.917 2.887 3.476 4.375 5.085 6.034 6.803 7.593 9.523 1440 24.000 2.890 3.480 4.380 5.090 6.040 6.810 7.600 9.530 WA TERSHED SOILS DA TA HOLLY SPRINGS TC KRG -11010 HOLLY SPRINGS TC WATERSHED SOIL INFORMATION J. ALLEN, EI KRG -11010 10/7/2013 Watershed soils from the Wake County Soil Survey Symbol ..:, Name deb GeorgeviIle silt loam HrB Herndon silt loam HrC Herndon silt loam HrD2 Herndon silt loam MfD2 MfE loam loam MgB Mayodan gravelly sandy loam B MgB2 Mayodan gravelly sandy loam B MgC Mayodan gravelly sandy loam B MyB Mayodan silt loam B MyD Mayodan silt loam B WY Worsham sandy loam D References: 1 Soil Survev: Wake Countv, North Carolina United States Department of Agriculture: Soil Conservation Service (in cooperation with North Carolina Agriculture Experiment Station). 2 SCS TR -55 United States Department of Agriculture. Soil Conservation Service. 1986. COVER CONDITION " SCS CN -HSG B Impervious- 98 Open 61 Wooded 55 Pond 100 COVER CONDITION SCS CN - HSG D Impervious 98 Open _ 80 Wooded 77 Pond 100 WAKE COUNTY, NORTH CARMNA SHEET Numistw 83 (joins Fhroc 7-5) 83 P-C2 A'// my ice AeP r -�N CAF .13 -A t i-, 2 cec A I,E t 0 x 1 E U B MfE ;g CgE12 A AgP2 m MICIR AfA y M2 qc$ 6r-18, --. Nys V ti r wrc 2 cgc ag r. ag D f H 7 4�M G eC, n iv �v c >�I� wo cec; 982 rl Ag8' tv, Enb GeD2 AgC2 cec, y'- W, 8 AgG2 Ag f kJ cgc gB2 MgB2 Aga tT 'AW Yon t <r /�, i' f ^� % y i, 1{, Gc. s nJ l - � �.A.,: --' -` ( r°: , ; V�-rc _ d `t -: �. `•. C r:,2 t K' : ` f �� } j , - - ' PR�.,;� r i — � -•-,� 1 % ^{,�� � -�; cef o U�- A, r G V c f Ae&: Geoz 2* D Age mgo? 'Axty cm fir" pAgC2 ge Ll c Mga-7 VA • Hrc 30: c F_ C.C2 gic l e. 9 2. cm Af- L -A gco CgB -AgB2 - R02 �R2 Vl - V, fAga A962 f�S j4-gC2 MgSz- Mgc2 -.c A, MgZ- cga mgc, r 17 A K /ug M90 lcl Sunset Lake ---,CgB tA CgM Hoily 5pr Ings 4 A Wn , o6z tz 'Ur - - 2- aB2 Soil mop constructed 1967 by Cartographic Division, Soil Conservation Service, USDA, from 1965 aerial photographs. Controlled mosaic based on North ' Carolina plane coordinate system, Lambert conformal conic projection, 1927 North American datum: - U. S. DEPARTMENT OF AGRICULTURE -- SOIL CONSERVATION SERVICE WAKE COUNTY NORTH CAROLINA NORTH CAROLINA AGRICULTURAL EXPERIMENT STATiOftt The first capital letter es� initial one of the so,I name. A second capital I_ 3, E, or F, shows the slope. Most symbols witFtora a 51 ape letTer are those of nearly level soils or Ioadfypes bat same are for land types that have a constderabre range of ;lope. The number, 2 or 3, in o symbol st wstfgc ,f,£ soil is eroded or severely eroded. SYMBOL NAME SYMBOL NAME SYMBOL NAME AfA Altavista fine sandy loam, 0 to 4 percent slopes GeB Georgeville silt loam, 2to..�par_ -n: slopes NoA Norfolk loamy sand, 0 to 2 percent slopes Ag8 Appling gravelly sandy loam, 2 to 6 percent slopes GeB2 Georgeville silt laaa:, _ - -_ _ant slopes, eroded Nob Norfolk loamy sand, 2 to 6 percent slopes Ag82 Appling gravelly sandy loam, 2 to b percent slopes, eroded GeC Georgeville silt - - r slopes NoB2 Norfolk loamy send, 2 to 6 slopes, eroded AgC Appling gravelly sandy loom, 6 to 10 percent slopes GeC2 Georgeville silt farm. _ -_ n, slopes, eroded NoC percent Norfolk loamy sand, 6 to iC portent slopes AgC2 Appling gravelly sandy loam, 6 to 10 percent slopes, eroded GeD2 . Georgeville sit loo sent slopes, eroded NoC2 Norfolk loamy sand, 6 to 10 percent slopes, eroded APB Appling sandy loam, 2 to 6 percent slopes Go Goldsboro sandy laaa ApB2 Appling sandy loam, 2 to b percent slopes, eroded GrB Granville sandy - y .tarn, ._ - - a-cer,t slopes OrB Orangeburg loamy sand, 2 t 6 percent slopes ApC Appling sandy loam, 6 to 10 percent slopes GrB2 Granville sandy I.e., -- _ _rcenr slopes, eroded OrB2 Orangeburg loamy sand, 2 to 6 percent slopes, eroded AgC2 Appling sandy loam, 6 to 10 percent slopes, eroded GrC Granville sandy loa. -, -_ Z _rc—T siapas OrC2 Orangeburg loamy sand, 6 to 10 slopes, eroded ApD Appling sandy loam, 10 to 15 percent slopes GrC2 Granville loot. sandy - - ; =_rcznt slopes, eroded percent _ AsB Appling fine sandy loam, 2 to 6 percent slopes GrD Granville sandy ro_- -: - _ercant slopes PkC Pinkston sandy loom, 0 to 10 percent slopes - As B2 Appling fine sandy loam, 2 to 6 percent slopes, eroded Gu Gullied land PkF Pinkston sandy loam, 10 to 45 percent slopes AsC Appling fine sandy foam, 6 to 10 percent slopes Ps Plummer sand AsC2 Appling fine sandy Foam, 6 to 10 percent slopes, eroded HeB Helena sandy loam, 2._ -= ­•.:­t slopes Au Augusta fine sandy loam HeB2 Helena sandy foam, - -- _ __. __:.- slopes, eroded Ro Rains fine sandy loam C HeC Helena sandy loam, c- slopes Ro Roanoke fine sandy loam Bu Buncombe soils HeC2 Helena sandy Loom o ta. - slopes, eroded HeD Helena sandy loom, U.._ slopes Sw Swamp CeB Cecil sandy loam, 2 t 6 percent slopes HrB Herndon silt loom, 2r z'op =_s G CeB2 Cecil sandy loam, 2 to b percent slopes, eroded HrB2 Herndon silt loam, r -'. . _._ -. _;apes, eroded VaB Vance sandy loom, 2 to 6 percent slopes - CeC - Cecil sandy loom, 6 to 10 percent slopes HrC Herndon silt loan 6 - _ ;topes VaB2 Vance sandy loam, 2 to 6 percent slopes, eroded 7 CeC2 Cecil sandy loam, b to 10 percent slopes, eroded HrC2 Herndon silt loom, -_ . - siopes, eroded VaC2 Vance sandy loam, 6 to 10 slopes, — CeD Cecil sandy loam, 10 to 15 percent slopes HrD2 Herndon silt loam, ��... = -__- -, slopes, eroded percent eroded = CeF Cecil sandy loam, 15 to 45 percent slopes HrE Herndon silt loom., -VC WaA Wogrom loamy sand, 0 to 2 percent slopes CgB Cecil gravelly sandy loam, 2 t 6 percent slopes WoB Wagram loamy sand, 2 t 6 percent slopes < CgI32 Cecil gravelly sandy loam, 2 to 6 percent slopes, eroded LdB2 Lloyd loam, 2 to o .s - arouec WaC Wogrom loamy sand, 6 to 10 percent slopes -- C9C Cecil gravelly sandy loam, 6 to 10 percent slopes LdC2 Lloyd foam, 6 to It e =.- _._.e_, eroded WgA Wagram -Troup sands, 0 to 4 percent slopes _ CgC2 Cecil gravelly sandy loam, 6 to 10 percent slopes, eroded L dD2 Lloyd loom, 10 to aroded W'h Wobee fine sandy loam _ CI63 Cecil cloy loam, 2 to 6 percent slopes, severely eroded LoB Louisburg loamy scn-,4 slopes WkC Woke soils, 2 to 10 percent slopes CIC3 Cecil clay loam, b to 10 percent slopes, severely eroded LoC Louisburg loamy sor -�•. - ce -��.,t slopes WkE Wake soils, 10 to 25 percent slopes CIE3 Cecil clay loom, 10 to 20 percent slopes, severely eroded LoD Louisburg loamy sac.=, - ` -_.- giant slopes WmB Wedowee sandy loam, 2 to 6 percent slopes Cm Chewacla soils LwB Louisburg-Wedowee- - 5 percent slopes WmB2 Wedowee sandy loam, 2 to 6 percent slopes, eroded Cn Colfax sandy loam LwB2 Louiab.,g-Wed.—ee percent slopes, eroded WmC Wedowee sandy loam, 6 to 10 percent slopes ZCc Congaree fine sandy loam LwC Louisburg- Wedoeree e:. -�_ _.. -- - -_ �0 percent slopes WmC2 Wedowee sandy loam, 6 to 10 percent slopes, eroded — Cp Congaree silt Loam L wC2 Louisburg- Wedawee co,z _ _ ,0 percent slopes, eroded WmD2 Wedowee sandy loam, 10 to 15 percent slopes, eroded CrB Creedmoor sandy loam, 2 to 6 percent slopes Ly Lynchburg sandy loam WmE Wedowee sandy loam, 15 to 25 percent slopes - CrB2 Creedmoor sandy loom, 2 to 6 percent slopes, eroded Wn Wehadkee silt loam CrC Creedmoor sandy loam, b to 10 percent slopes - Me Made land We Wehadkee and Bibb soils —' - CrC2 Creedmoor sandy Loam, 6 to 10 percent slopes, eroded MdB2 Madison sandy loam: -. _ -__-,: slopes, eroded WsB White Store sandy loam, 2to 6 percent slopes < - CrE Creedmoor sandy loam, 10 to 20 percent slopes MdC2 Madison sandy loo-,. - - . -.__rr slopes, eroded WsB2 White Store sandy loam, 2 to b percent slopes, eroded CtB Creedmoor silt loam, 2 to 6 percent slopes MdD2 Madison sandy loan, - =scent slopes, eroded WsC White Store sandy loam, 6 to 10 percent slopes CtC Creedmoor silt loom, 6 to 10 percent slopes MdE2 Madison sandy loam,' - -_ _. __nr slopes, eroded WsC2 White Store sandy loam, 6 to 10 percent slopes, eroded Me Mantochie soils - WsE White Store sandy loom, 10 to 20 percent slopes Dub Durham loamy sand, 2 to 6 percent slopes MfB Mayodon sandy loom, - - - sr_nt slopes- WtB White Store silt loam, 2 to 6 percent slopes Du B2 Durham loamy sand, 2 to 6 percent slopes, eroded MfB2 Mayodon sandy loom. =eE_,t slopes, eroded WvD3 White Store clay loam, 2 to 15 percent slopes, - DuC Durham foamy sand, 6 to 10 percent slopes MfC Mayodon sandy loam, slopes severely eroded - DuC2 Durham loamy sand, 6 to 10 percent slopes, eroded MfC2 Mayodon sandy loom. < -- - vcco; slopes, eroded WwC Wilkes soils, 2 t 10 percent slopes MfD2 Mayodon sandy Icm-. - - _ercenr slopes eroded WwE Wilkes soils, 10 to 20 percent slopes EnB Enon fine sandy loam, 2 to b percent slopes MfE Mayodon sandy Ica -.. - = - _ _en; slopes WwF Wilkes soils, 20 to 45 percent slopes En B2 Enon fine sandy loam, 2 to 6 percent slopes, eroded MgB Mayodon gravelly se7- - - _ 5 percent slopes WxE Wilkes stony soils, 15 to 25 percent slopes _ EnC Enon fine sandy loam, 6 to 10 percent slopes M962 Mayodan gravelly sane•_- percent slopes, eroded Wy Worsham sandy loam EnC2 Enon fine sandy loam, 6 to 10 percent slopes, eroded MgC Mayodon gravelly sand -; '- c .o !0 percent slopes En D2 Enon fine sandy loam, 10 to 115 percent slopes, eroded MgC2 Mayodon gravelly sandy ?ca-., ^_ To 10 percent slopes, eroded MyB Mayodon silt toom,.thin, _ ,_ _ n_,-enT slopes - - - -- F,.7] F��w;l!e =randy loam,? t 6 percent slopes M B2 Mayodon silt loom, thi ^, - t- <, percent slopes_, eroded Fa 82 Foceville sandy loam, 2 to-6 percent slopes, eroded MyC Mayodon silt oom, v wpercent s opal s` FoC2 Faceville sandy loom, 6 to 10 percent slopes, eroded MyC2 Mayodon silt loam, 16'n, t 10' percent slopes, eroded MyD Mayodon silt loam, this; l :e. 114E percent slopes Soil mop constructed 1967 by Cartographic Division, Soil Conservation Service, USDA, from 1965 aerial photographs. Controlled mosaic based on North ' Carolina plane coordinate system, Lambert conformal conic projection, 1927 North American datum: - PRE- DEVELOPMENT HYDROLOGY CALCULATIONS HOLLY SPRINGS TC KRG -11010 NEW HII ',ACE PRE- DEVELOPME1- NPUT SUMMARY B. IHNA" `A, PE KRG -11 6/2011 Sub -basin ID IA 1B IC 1D lE IF 1G 1H lI 2A 2B 2C- ONSITE 2C- OFFSITE 3A 3B 3C 3D 3E- ONSITE 3E- OFFSITE 4 5- ONSITE 5- OFFSITE Unanalyzed Site Area Totals = On -: ite Area [acres] Off -site Area [acres] Total Area 1/4 Ac [acres] Open Wooded Impervious Pond Total Open Wooded Impervious Resid Lots Pond Total 0.00 12.04 0.00 0.00 12.04 0.00 0.00 0.00 0.00 0.00 0.00 12.04. 0.00 4.55 0.00 0.00 4.55 0.00 0.00 0.00 0.00 0.00 0.00 4.55 0.00 0.89 0.00 0.00 0.89 0.00 0.00 0.00 0.00 0.00 0.00 0.89 0.00 0.48 0.00 0.00 0.48 0.00 0.00 0.00 0.00 0.00 0.00 0.48 0.27 7.56 0.10 0.00 7.93 0.01 0.00 0.00 0.00 0.00 0.01 7.94 0.02 1.73 0.06 0.00 1.82 0.00 0.00 0.00 0.00 0.00 0.00 1.82 0.06 15.15 0.13 0.00 15.34 0.00 0.00 0.00 0.00 0.00 0.00 15.34 1.10 11.92 0.19 0.00 13.21 0.53 0.01 0.47 0.00 0.00 1.01 14.22 2.55 25.46 0.69 0.00 28.70 0.33 0.00 0.54 0.00 0.00 0.87 29.57 0.03 6.05 0.03 0.00 6.11 0.00 0.00 0.00 0.00 0.00 0.00 6.11 0.00 4.76 0.00 0.00 4.76 0.00 0.00 0.00 0.00 0.00 0.00 4.76 0.05 21.30 0.05 0.00 21.40 0.00 0.00 0.00 0.00 0.00 0.00 21.40 0.00 0.00 0.00 0.00 0.00 5.00 0.34 1.63 0.77 S 0.00 7.74 7.74 0.00 0.95 0.00 0.00 0.95 0.00 0.00 0.00 0.00 0.00 0.00 0.95 0.00 0.51 0.00 0.00 0.51 0.00 0.00 0.00 0.00 0.00 0.00 0.51 0.00 17.49 0.00 0.00 17.49 0.00 2.24 0.00 0.00 0.00 2.24 19.72 0.00 3.28 0.00 0.00 3.28 0.00 0.00 0.00 0.00 0.00 0.00 3.28 0.00 8.20 0.00 0.00 8.20 0.00 0.00 0.00 0.00 0.00 0.00 8.20 0.00 0.00 0.00 0.00 0.00 4.61 1.31 1.35 3.88 0.00 11.15 11.15 0.00 2.62 0.00 0.00 2.62 0.00 0.17 0.00 0.00 0.00 0.17 2.79 0.00 7.68 0.00 0.00 7.68 0.00 0.00 0.00 0.00 0.00 0.00 7.68 0.00 0.00 0.00 0.00 0.00 3.46 1.91 1.06 2.46 0.00 8.89 8.89 0.40 10.16 0.00 0.00 10.56 0.00 0.00 0.00 0.00 0.00 0.00 10.56 4.49 162.78 1.27 0.00 168.53 13.94 5.98 5.05 7.11 0.00 32.08 200.61 NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre - development - Subbasin #IA 12/6/2011 I. SCS CURVE NUMBERS S Impervious 4 pen I Wooded A 98 3930 Assume. HSG'A'= 0.0% ' Comments - onsite impervious HSG'B'= 94.6% C 4 Onsite open _ HSG'C' = 0.0% Assume good condition Assume good condition Onsite wooded HSG'D'= 5.4% 100 Cover Condition _ 98 0.00 SCS CN Comments Impervious 0.00 98 _0.00 Open Offsite wooded 62 Assume good condition�M -Assume _ Wooded 1 Woods - Light Underbrush good condition 11. PRE - DEVELOPMENT inches (Wake County, NC) Segment Time = 23.75 A. Watershed Breakdown Segment 3: Channel Flow Contributing Area SCS CN Area [acres] ' Comments - onsite impervious 98 0.00 C 4 Onsite open _ } 62 �- 0.00 12.04 0.00 Assume good condition Assume good condition Onsite wooded 1 56 Onsite 100 Offsite impervious _ 98 0.00 _ Offsite open _ -� _62 _ 0.00 good condition _0.00 _Assume Assume good condition _ - _ Offsite wooded 6 56-- Offsite pond Manning's n = 0.40 Woods - Light Underbrush Total area = 12.04 acres ft 0.0188 sq.mi. Composite SCS CN = 56 0.0634 % Impervious = 0.0% No B. Time of Concentration Information Velocity = 4.06 ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow minutes Length = 100 ft Height = 1.4 ft Slope = 0.0140 ft/ft Manning's n = 0.40 Woods - Light Underbrush P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Segment Time = 23.75 minutes Segment 3: Channel Flow Length = 794 ft Slope = 0.0664 0.0664 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume Tx 1' Channel) Wetted Perimeter = 4.00 ft (Assume 2'x 1' Channel) Channel Velocity = 5.37 ft/sec Segment Time = 2.46 minutes Time of Concentration = 27.46 SCS Lag Time = 16.47 Time Increment = 4.78 Segment 2: Concentrated Flow Length = 303 ft Height = 19.2 ft Slope = 0.0634 ft/ft Paved ? = No Velocity = 4.06 ft/sec Segment Time = 1.24 minutes minutes minutes (SCS Lag = 0.6* Tc) minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin #1 B 12/6/2011 I. SCS CURVE NUMBERS HSG Impervious Open Wooded A 98 39 30 B 98 61 55 C 98 74 70 D 98 80 77 Assume: HSG'A'= 0.0% HSG'B' = 66.8% HSG'C' = 0.0% HSG'D' = 33.2% Cover Condition j SCS CN Comments Impervious 98 - Open 67 Assume good condition Wooded f 62 Assume good condition II. PRE - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.00 Onsite open 67 0.00 Assume good condition Onsite wooded 62 4.55 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 67 0.00 Assume good condition Offsite wooded 62 0.00 Assume good condition Offsite pond 100 0.00 - Total area = 4.55 acres 0.0071 sq.mi. Composite SCS CN = 62 % Impervious = 0.0% B. Time of Concentration Information ***Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment]: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 384 ft Height= 6.2 ft Height= 55.55 ft Slope = 0.0620 ft/ft Slope = 0.1447 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 6.14 ft/sec Segment Time = 13.10 minutes Segment Time = 1.04 minutes Time of Concentration = 14.14 minutes SC:S -Lag Time = 6.4a minutes (SCS Lag = u.64 1 c) Time Increment = 2.46 minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS KRG -11000 Pre- development - Subbasin #1 C 1. SCS CURVE NUMBERS B. IHNATOLYA, PE 12/6/2011 HSG Impervious I Open Wooded A �. 98 39 30 B 98 61 55 C 98 74 70 D 98 ( 80 77 Assume: HSG'A' = 0.0% HSG'B'= 75.9% HSG'C'= 0.0% HSG'D' = 24.1% Cover Condition f. SCS CN Comments Impervious 98 j Open P 66 � ssume good condition Wooded 60 Assume good condition Il. PRE- DEVELOPMENT; A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.00 Onsite open 66 0.00 Assume good condition Onsite wooded 60 0.89 + Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 66 0.00 Assume good condition Offsite wooded 60 0.00 Assume good condition Offsite pond 100 0.00 Total area = 0.89 acres 0.0014 sq.mi. Composite SCS CN = 60 % Impervious = 0.0% B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 261 ft Height = 10.3 ft Height = 41.2 ft Slope = 0.1030 ft/ft Slope = 0.1579 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 6.41 ft/sec Segment Time = 10.69 minutes Segment Time = 0.68 minutes - Time of Concentration = 11.37 6.82 minutes - SCS Lag Time = 6.82 minutes (SCS Lag = 0.6* Tc) Time - Increment - minutest =- 0.29 *SCS -Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre - development - Subbasin #ID 12/6/2011 ' SCS CURVE NUMBERS HSG Impervious Open Wooded A 98 39 30 B 98 61 55 C 98 74 70 D 98 80 77 Assume: HSG'A' = 0.0% HSG'B'= 58.5% HSG'C' = 0.0% HSG 'D' = 41.5% Cover Condition SCS CN Comments Impervious 98 - Open 69 Assume good condition Wooded 64 Assume good condition II. PRE - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.00 - Onsite open 69 0.00 Assume good condition Onsite wooded 64 0.48 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 69 0.00 Assume good condition Offsite wooded 64 0.00 Assume good condition Offsite pond 100 0.00 Total area = 0.48 acres 0.0008 sq.mi. Composite SCS CN = 64 % Impervious = 0.7% B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 221 ft Height = 9.3 ft Height = 45.8 ft Slope = 0.0930 ft/ft Slope = 0.2072 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 7.35 ft/sec Segment Time = 11.14 minutes Segment Time = 0.50 minutes Time of Concentration = 11.64 minutes I SCS Lag Time = 6.98 minutes (SCS Lag = 0.6* Tc) Trme-fitcrement= ­10-2-minutes-(= -- -- NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin #1 E 12/6/2011 SCS CURVE NUMBERS HSG Impervious Open Wooded �m.. A 98 I .. - 39 i -- 30 - 98 61 55 C 98 74 70 D 98 t - 80� 77 Assume: HSG'A' = 0.0% HSG 'B' = 92.2% HSG 'C' = 0.0% HSG'D'= 7.8% Cover Condition SCS CN Vomments Impervious_ 98 �T� Open_ 62 Assume good condition Wooded Y 57 Assume good condition 11. PRE - DEVELOPMENT A. Watershed Breakdown Contributing Area j SCS CN Area [acres] j Comments € Onsite impervious ( Onsite open_ 988 n 0.10 62 1 0.27 Assume good condition _ Onsite wooded 57 1 7.56 i A_ ssum_e_good- condition Onsite pond +�TV�100 Height = M 0.00_ A yOffsite impervious 98 � 00 tt� �.. Offsite open 62 0.01 Assume good condition Offsite wooded 57 0.00 Assume good condition Offsite pond 100 0.00 Total area = 7.94 acres 3.48 0.0124 sq.mi. Composite SCS CN = 57 23.75 % Impervious = 1.3% minutes B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 290 ft Height = 1.4 ft Height = 30.7 ft Slope = 0.0140 ft/ft Slope = 0.1059 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 5.25 ft/sec Segment Time = 23.75 minutes Segment Time = 0.92 minutes Segment 3: Channel Flow Length = 565 ft - Height= - - 3- 1 -.3G - -ft - - - Slope= 0.0555 ft/ft Manning's n = 0.045 Natural Channel Flow Area= 2.00 sf (Assume Tx 1' Channel) Wetted Perimeter = 4.00 ft (Assume 2'x I' Channel) Channel Velocity = 4.91 ft/sec Segment Time = 1.92 minutes Time of Concentration = 26.59 minutes SCS Lag Time = 15.95 minutes (SCS Lag = 0.6* Tc) Time Increment = 4.63 minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre - development - Subbasin #1 F 12/6/2011 ' SCS CURVE NUMBERS HSG Impervious I Open Wooded A _ . I .. 98 39 30 B i 98 61 55 C 98 74 70 D I 98 80 77 Assume. HSG'A' = 0.0% HSG'B' = 56.8% HSG 'C' = 0.0% HSG'D'= 43.2% Cover Condition ( SCS CN Comments Impervious 98 Open 69 Assume good condition Wooded I 64 Assume good condition II. PRE - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.06 - Onsite open 69 0.02 Assume good condition Onsite wooded 64 1.73 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 69 j 0.00 Assume good condition Offsite wooded 64 0.00 Assume good condition .. . Offsite pond E1 100 4 0 .0 0 ._ . _ - Total area = 1.82 acres 0.0028 sq.mi. Composite SCS CN = 66 % Impervious = 3.5% B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 155 ft Height = 11 ft Height = 30.28 ft Slope = 0.1100 ftift Slope = 0.1954 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 7.13 ft/sec Segment Time = 10.41 minutes Segment Time = 0.36 minutes Time of Concentration = 10.77 minutes SCS Lag Time = 6.46 minutes (SCS Lag = 0.6* Tc) T1me4ncremeni-- 1-.-67 . ,.,. I ies — . 9*SCS-Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG-11000 Pre-dev . e . I . opmen . I - Subbas . in #JG 1.1,11- 12/6/2011 ' SCS CURVE NUMBERS Hsu impervious 1 open 1 wooaeo A SCS CN 98 39 30 Onsite 98 i 0.13 i 55 C 61 98 74 70 D 15.15 Assume good condition 98 Onsite pond Assume: HSG'A'= 0.0% Offsite impervious 98 HSG'B'= 99.8% Offsite open 61 1 000 Assume good condition HSG'C'= 0.0% 55 1 0.00 Assume good condition 11 HSG'D'= 0.2% 00 C!ov—erConditio; SCS CN Comments Im Lealous acres 98 0.0240 61 1 —1 Assume good condition -Open Wooded 55 i Assume good condition If. PRE-DEVELOPNIENT B. Time of Concentration Information A. Watershed Breakdown Contributing Area SCS CN Area (acres) Comments Onsite 98 i 0.13 i Onsite open 61 006 Assume food Onsite wooded 15.15 Assume good condition Onsite pond 100 -- Offsite impervious 98 000 Offsite open 61 1 000 Assume good condition Offsite wooded 55 1 0.00 Assume good condition 11 Offsite pond 00 0.00 Total area = 15.34 acres 0.0240 sq.mi. Composite SCS CN = 55 % Impervious = 0.9% B. Time of Concentration Information "Time of concentration is calculated using the SCS Segmental Approach (TR-55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 134 ft Height = 3 It Height = 17.6 ft Slope = 0.0300 ft/ft Slope = 0.1313 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2-year/24-hour) = 3.48 inches (Wake County, NQ Velocity = 5.85 11/sec Segment Time = 17.51 minutes Segment Time = 0.38 minutes Segment 3: Channel Flow Length = 1537 ft Height= -- 76.08- - — —ft Slope = 0.0495 ft/ft Manning's n = 0,045 Natural Channel Flow Area = 2.00 sf(Assume 2'x 1' Channel) Wetted Perimeter = 4.00 ft (Assume 2'x I' Channel) Channel Velocity = 4.64 ft/sec Segment Time = 5.52 minutes Time of Concentration = 23.41 minutes SCS Lag Time = 14.05 minutes (SCS Lag = 0.6* Tc) Time Increment = 4.07 minutes (-- 0.29*SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin #1 H 12/6/2011 s SCS CURVE NUMBERS IISG Impervious Open Wooded A 98 39 30 B 98 61 55 C 98 74 70 D 98 80 77 Assume: HSG'A' = 0.0% HSG'B' = 92.5% HSG'C' = 0.0% HSG'D' = 7.5% Cover Condition SCS CN Comments Impervious 98 Open 62 Assume good condition Wooded 57 { Assume good condition 11. PRE - DEVELOPMENT A. Watershed Breakdown Contributing Area CS CN SCS Area [acres] � Comments Onsite impervious 0.19 - Onsite open 62 1.10 1 Assume good condition Onsite wooded 57 11.92 ( Assume good condition Onsite pond 100 0.00 ( - Offsite impervious 98 0.47 { Offsite open 62 0.53 { Assume good condition Offsite wooded 57 0.01 { Assume good condition Offsite pond 100 0.00 { Total area = 14.22 acres 0.0222 sq.mi. Composite SCS CN = 59 % Impervious = 4.6% B. Time of Concentration Information ***Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 320 ft Height = 3 ft Height = 31.8 ft Slope = 0.0300 ft/ft Slope = 0.0994 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 5.09 ft /sec Segment Time = 17.51 minutes Segment Time = 1.05 minutes Segment 3: Channel Flow Length = 1004 ft II:.6ht= 42-.36- t - - Slope = 0.0422 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 4.00 sf (Assume 2'x 2' Channel) Wetted Perimeter = 6.00 ft (Assume 2'x 2' Channel) Channel Velocity = 5.19 ft/sec Segment Time = 3.22 minutes Time of Concentration = 21.78 minutes I SCS Lag Time = 13.07 minutes (SCS Lag = 0.6* Tc) Time Increment = 3.79 minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin #H 12/6/2011 ' SCS CURVE NUMBERS HSG A B 29.57 acres impervious ; 98 98 -- -1 upen a wooaea 39 �"� 30 61 55 pOnsite impervious Onsite open _ M_� __. D 2.5_ Assume good condition 98 80 77 Assume: HSG 'A' = 0.0% inches (Wake County, NC) 100_ HSG'B'= 98.7% T _ 98 E HSG 'C' = 0.0% Manning's n = 61 HSG'D' = 1.3% sf (Assume 2' x 2' Channel) Cover Condition SCS CN Comments 4 _ Impervious _ _ ��t # 98 i sAssume Open 5.33 61 i good condition Wooded 55 R Assume good condition IL PRE - DEVELOPMENT A. Watershed Breakdown Contributing Area 29.57 acres i SCS CN Area j 98 [acres] Comments 0.69 - __ pOnsite impervious Onsite open _ M_� _ 61� 2.5_ Assume good condition Onsite wooded 0.40 55 25.46 Assume good condition Onsite pond inches (Wake County, NC) 100_ 0.00 - Offsite impervious T _ 98 E 0.54 ` Offsite open Manning's n = 61 0.33 1 Assume good c_ondition _ Offsite wooded � sf (Assume 2' x 2' Channel) -_ _ _55 - _ 0.00 Assume good condition _0 Offsite pond 6.00 fi 100 i 0.00 - Total area = 29.57 acres ft 0.0462 sq.mi. Composite SCS CN = 58 % Impervious = 4.2% B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Length = 100 ft Height = 2.3 ft Slope = 0.0230 ft/ft Manning's n = 0.40 Woods - Light Underbrush P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Segment Time = 19.47 minutes Segment 2: Concentrated Flow Length = 271 ft Height = 24.2 ft Slope = 0.0893 ft/ft Paved ? = No Velocity = 4.82 ft/sec Segment Time = 0.94 minutes Segment 3: Channel Flow Segment 4: Channel Flow Length = 1011 ft Length = 914 --- - -- - - - Height=--- 45- - -ft - -- - Height=-- -23.36 Slope = 0.0445 ft/ft Slope = 0.0256 Manning's n = 0.045 Natural Channel Manning's n = 0.045 Flow Area = 4.00 sf (Assume 2' x 2' Channel) Flow Area = 9.00 Wetted Perimeter = 6.00 ft (Assume 2'x 2' Channel) Wetted Perimeter = 9.00 Channel Velocity = 5.33 ft/sec Channel Velocity = 5.29 Segment Time = 3.16 minutes Time of Concentration = SCS Lag Time = Time Increment = ft ft-- - - - ft/ft Natural Channel sf (Assume Y x 3' Channel) ft (Assume Y x 3' Channel) ft/sec Segment Time = 2.88 minutes 26.45 minutes 15.87 minutes (SCS Lag = 0.6* Tc) 4.60 minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin #2A 12/6/2011 ' SCS CURVE NUMBERS HSG Impervious Open Wooded A 98 39 30 B 98 61 55 C 98 74 70 D 98 80 77 Assume: HSG 'A' = 0.0% HSG'B'= 98.0% HSG'C'= 0.0% HSG'D' = 2.0% Cover Condition SCS CN I Comments Impervious 98 Open 61 ( Assume good condition Wooded 55 Assume good condition H. PRE - DEVELOPMENT A. Watershed Breakdown Contributing Area ( SCS CN Area [acres] Comments Onsite impervious 98 0.03 - Onsite open 61 0.03 Assume good condition Onsite wooded 55 6.05 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 61 0.00 Assume good condition Offsite wooded 55 I 0.00 Assume good condition_ Offsitc pond 100 f 0.00 - Total area = 6.11 acres 0.0095 sq.mi. Composite SCS CN = 56 % Impervious = 0.5% B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 490 ft Height = 7.6 ft Height = 57.45 ft Slope = 0.0760 ft/ft Slope = 0.1172 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 5.52 ft/sec Segment Time = 12.07 minutes Segment Time = 1.48 minutes Time of Concentration = 13.55 minutes SCS Lag Time = 8.13 minutes (SCS Lag = 0.6* Tc) Time- Increment= - -1,6 Anutes{= �29*SCS -Lag) -- NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin #2B 12/6/2011 SCS CURVE NUMBERS HSG SCS CN Impervious Open i Wooded Onsite impervious 98 98 639 30 .. B 65 0.00 1 55 C 60 98 74 70 D 100 98 80 77 Assume: HSG'A' = 0.0% - Offsite open HSG'B' = 77.5% Assume good condition Offsite wooded HSG'C' = 0.0% Assume good condition Offsite pond HSG'D' = 22.5% Cover Condition 4.76 SCS CN Comments Impervious 0.0074 98 - Open 60 65 Assume good condition Wooded 0.0% 60 Assume good condition H. PRE- DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN f Area [acres] Comments Onsite impervious 98 0.00 - Onsite open 65 0.00 Assume good condition Onsite wooded 60 4.76 Assume good condition Onsite pond i 100 0.00 - Offsite impervious 98 0.00 - Offsite open 65 0.00 ! Assume good condition Offsite wooded 60 0.00 Assume good condition Offsite pond 100 0.00 Total area = 4.76 acres I 0.0074 sq.mi. minutes (SCS Lag = 0.6* Tc) Composite SCS CN = 60 % Impervious = 0.0% B. Time of Concentration Information * * *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 350 ft Height = 4.2 ft Height = 43.2 ft Slope = 0.0420 ft/ft Slope = 0.1234 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 5.67 ft/sec Segment Time = 15.30 minutes Segment Time = 1.03 minutes Time of Concentration = 16.33 minutes I SCS Lag Time = 9.80 minutes (SCS Lag = 0.6* Tc) — Time - Increment – 241 m ?nutes+---O-.29-*SGS -Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG-I 1000 Pre-development - Subbasin #2C-Onsite 12/6/2011 SCS CURVE NUMBERS Assume: HSG'A'= 0.0% HSG'13'= 93.1% HSG'C'= 0.0% HSG'D'= 6.9% over Condition I SCS C i omments 98 Open �2+ Assume good condition Wooded 57 ssume good condition 1/4 Ac. Lots 76_� Assume 39% Impervious 11. PRE-DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite imlnrY!0Us_ 98 0.05 Onsite open i 62 Onsite wooded 57 0.05 i 21.30 Assume good condition Assume good condition Onsite pond j 100 0.00 Offsite impervious 98 T 0.00 1 Offsj�e oEj�,j___ 1 Assume good condition Offlite wooded 57 0.00 Assume good condition Offlite 1/4 Ac Resid. Lots 4-76 Assume 38% Impervious Offsite pond 100 1 0.00 Total area = 21.40 acres 0.0334 sq.mi. Composite SCS CN = 57 % Impervious = 0.3% B. Time of Concentration Information *Time of concentration is calculated using the SCS Segmental Approach (TR-55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 214 ft Height = 3.38 ft Height = 1.8 ft Slope = 0.0338 ft/ft Slope = 0.0084 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2-year/24-hour) = 3.48 inches (Wake County, NQ Velocity = 1.48 ft/sec; Segment Time = 16.69 minutes Segment Time = 2.41 minutes Segment 3: Channel Flow - Segment 4: Channel-Flow- - - Length = 1131 ft Length = 398 ft Height = 50.2 ft Height = 8.89 ft Slope = 0.0444 ft/ft Slope = 0.0223 ft/ft Manning's n = 0.045 Natural Channel Manning's n = 0.045 Natural Channel Flow Area = 4.00 sf (Assume 2'x 2' Channel) Flow Area = 12.00 sf (Assume 4' x3' Channel) Wetted Perimeter = 6.00 ft (Assume 2'x 2' Channel) Wetted Perimeter = 10.00 ft (Assume 4'x YChannel) Channel Velocity = 5.32 ft/see Channel Velocity = 5.59 ft/sec Segment Time = 3.54 minutes Segment Time = 1.19 minutes NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre - development - Subbasin #2C- Onsite 12/6/2011 Time of Concentration = 23.83 minutes SCS Lag Time = 14.30 minutes (SCS Lag = 0.6* Tc) Time Increment = 4.15 minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. ffiNATOLYA, PE KRG -11000 Pre - development - Subbasin #2C- Offsite 12/6/2011 SCS CURVE NUMBERS Assume: HSG'A'= 0.0% Area [acres] HSG'B'= 100.0% Onsite impervious HSG'C'= 0.0% ���- HSG'D'= 0.0% 61 Cover Condition 70 Comments SCS CN Impervious Open 98 61 Assume condition I Ofsite pond � good -- Wooded! 5T- Assume good condition 1/4 Ac. Resid. Lots -� 75 Assume 38 %o Impervious If. PRE -DE% ELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious Y 98 0.00 00 �- ���- - Assume Onsite_open 61 Composite SCS CN = 70 good condition Onsite wooded 55 i 0.00 % Impervious = good condition Ofsite pond � 100 I 0.00 _Assume _ Offsite impervious _ _ _ 98 1.63 Offsite open i 61 5.00 Assume good condition Offsite wooded i 55 0.34 Segment 1: Overland Flow good condition Offsite 1/4 Ac Resid. Lots 75 _ - 1 0.77 _Assume _ Assume 38% Impervious Offsite pond ; 100 ( 0.00 ft T - Total area = 7.74 acres 0.0121 sq.mi. Composite SCS CN = 70 % Impervious = 21.1% B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 37 ft Height = 3.9 ft Height = 1.8 ft Slope = 0.0390 ft/ft Slope = 0.0486 ft/ft Manning's n = 0.24 Dense Grasses Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 3.56 ft/sec Segment Time = 10.48 minutes Segment Time = 0.17 minutes Segment 3: C*annet Flow - Segment 4. Channel Flaw- - Length = 143 ft Length = 73 ft Height = 11.6 ft Height = 8.9 It Slope = 0.0811 ft/ft Slope = 0.1219 ft/ft Manning's n = 0.013 Assume 18" RCP Culvert Manning's n = 0.013 Assume 18" RCP Culvert Flow Area = 1.77 sf (Assume 18" RCP) Flow Area = 1.77 sf (Assume 18" RCP) Wetted Perimeter = 4.71 ft (Assume 18" RCP) Wetted Perimeter = 4.71 ft (Assume 18" RCP) Channel Velocity = 16.98 ft/sec Channel Velocity = 20.82 ft/sec Segment Time = 0.14 minutes Segment Time = 0.06 minutes NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin 42C- Offsite 12/6/2011 Time of Concentration = 10.85 minutes SCS Lag Time = 6.51 minutes (SCS Lag = 0.6* Tc) Time Increment = 1.89 minutes (= 0.29 *SCS Lag) NEW HILL PLACE SCS CN HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Comments Pre- development - Subbasin #3A 12/6/2011 SCS CURVE NUMBERS 0.00 HSG Onsite open Impervious j Open j Wooded A Assume good condition 98 39 30 B I 98 61 55 C Onsite pond 98 74 70 D j 98 80 77 Assume. HSG 'A' = 0.0% Offsite open HSG 'B' = 100.0% 0.00 Assume good condition HSG'C'= 0.0% 55 HSG 'D' = 0.0% Cover Condition I SCS CN j Comments Impervious Total area = 98 acres Open 61 Assume good condition Wooded ] 55 Assume good condition ii. PRE - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] � Comments Onsite impervious 98 0.00 Onsite open 61 0.00 Assume good condition Onsite wooded 55 ( 0.95 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 61 0.00 Assume good condition Offsite wooded 55 0.00 Assume good condition Offsite pond 100 0.00 Total area = 0.95 acres 0.0015 sq.mi. Composite SCS CN = 55 % Impervious = 0.0% B. Time of Concentration Information 'Time *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 219 ft Height= 14.8 ft Height= 36 ft Slope = 0.1480 ft/ft Slope = 0.1644 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 6.54 ft/sec Segment Time = 9.25 minutes Segment Time = 0.56 minutes Time of Concentration = 9.81 minutes SCS Lag Time = 5.88 minutes (SCS Lag = 0.6* Tc) Time4nerement— NEW HILL PLACE SCS CN HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin #3B 12/6/2011 x SCS CURVE NUMBERS 0.00 HSAG Onsite open Impervious Op9en ( Wooded Onsite wooded 55 ! 30 B I 98 61 55 C ` 98 74 ` 70 D 0.00 98 80 I 77 Assume: HSG'A' = 0.0% Assume good condition HSG 'B' = 100.0% 55 0.00 HSG'C'= 0.0% Offsite pond ( HSG 'D' = 0.0% - Cover Condition SCS CN Comments Impervious 98 Open 0.0008 61 Assume good condition Wooded 55 Assume good condition II. PRE - DEVELOPMENT A. Watershed Breakdown Contributing Area I SCS CN Area [acres] Comments Onsite impervious 98 0.00 Onsite open 61 1 0.00 Assume good condition Onsite wooded 55 0.51 I Assume good condition Onsite pond 100 0.00 Offsite impervious 98 0.00 Offsite open 61 0.00 Assume good condition Offsite wooded ; 55 0.00 Assume good condition Offsite pond ( 100 0.00 - Total area = 0.51 acres 0.0008 sq.mi. Composite SCS CN = 55 % Impervious = 0.0% B. Time of Concentration Information ***Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 163 ft Height = 7.4 ft Height = 20.2 ft Slope = 0.0740 ft/ft Slope = 0.1239 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 5.68 fl/sec Segment Time = 12.20 minutes Segment Time = 0.48 minutes Time of Concentration = 12.68 minutes SCS Lag Time = 7.61 minutes (SCS Lag = 0.6* Tc) Time4ii" -ement – —2-2 -1 minutes- (= 0.-2-9 *ECC I ag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin #3C f 12/6/2011 SCS CURVE NUMBERS HSG ( Impervious j open wooaea A 98 39 30 -- -- .B 98 61 55 C _ _ ___.. 98 __.._.. 74 70 80 D 98 0.00__ Assume: HSG 'A' = 0.0% 0.00 HSG 'B' = 100.0% open 61 HSG'C'= 0.0% Assume good condition _O_ffsite Offsite wooded HSG 'D' = 0.0% Cover Condition SCS CN i Comments Impervious_ 98 i SCS Segmental Approach (TR -55). �- Open 61 - - - -�- - Assume good condition Segment 1: Overland Flow Assume good condition H. PRE- DEVELOPMENT Segment 2: Concentrated Flow Length = A. Watershed Breakdown ft Length = Contributing Area SCS CIS k Area [acres] Comments nsite impervious 98 0.00 i 0.0308 _ _ _O_nsite open Onsite wooded 61 � 0.00 17.49 _ - Assume good condition Assume good condition Onsite pond _5� _5_ _ 100 -t 0.00__ w Offsiteimpervious ___98 0.00 0.0% open 61 0.00 Assume good condition _O_ffsite Offsite wooded _ 55 Assume good condition Offsite pond ; 100 00 1 SCS Segmental Approach (TR -55). Total area = 19.72 acres 0.0308 sq.mi. Composite SCS CN = 55 % Impervious = 0.0% B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 301 ft Height = 3.2 ft Height = 17.8 ft Slope = 0.0320 ft/11 Slope = 0.0591 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 3.92 ft/sec Segment Time = 17.06 minutes Segment Time = 1.28 minutes Segment 3: Channel Flow Length = 1116 ft Height= 69.01 ft - Slope = 0.0618 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume 2'x 1' Channel) Wetted Perimeter = 4.00 It (Assume 2'x 1' Channel) Channel Velocity = 5.19 ft/sec Segment Time = 3.59 minutes Time of Concentration = 21.93 minutes SCS Lag Time = 13.16 minutes (SCS Lag= 0.6* Tc) Time Increment = 3.82 minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre - development - Sub basin #3D 12/6/2011 ` SCS CURVE NtIMBERS Hsu i impervious 1 upen a wooaea A ii- 98 _55 100 -";- y _ B — 98 _ �F� 61 - -- 98 1 61 1 55 S. Time of Concentration Information 98 -� 74 w ~� 70 _o �J _C D W t _ 98 8077 86 Assume: HSG'A' = 0.0% 7.9 ft HSG 'B' = 100.0% ft/ft Manning's n = HSG 'C' = 0.0% P (2- year /24 -hour) = 3.48 HSG 'D' = 0.0% 11.89 Cover Condition SCS CN Comments Impervious Length = 98 1 - Open 61 Assume good conditionµ,L, Wooded ft/ft 55 1 Assume good condition ti. PRE- DEVELOPATENT A. Watershed Breakdown Contributing Area Onsite impervious _v Onsite open Onsite wooded Onsite pond Offsite impervious Offsite open Offsite wooded�� SCS CN Area [acres] 98 0.00 _ __ 61 0 0 _ 1 3.28_ u _55 100 -";- 0.00 98 _ �F� 61 - -- 0.00 0.00_ 55 S. Time of Concentration Information 106-- 0.00 ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Comments Assume good condition Assume good condition Assume good condition Total area = 3.28 acres Height = 0.0051 sq.mi. Composite SCS CN = 55 No % Impervious = 0.0% Segment Time = S. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Length = 100 It Height = 7.9 ft Slope = 0.0790 ft/ft Manning's n = 0.40 Woods - Light Underbrush P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Segment Time = 11.89 minutes Segment 3: Channel Flow Length = 270 ft Height = 23 ft Slope = 0.0852 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume 2'x 1' Channel) Wetted Perimeter = 4.00 ft (Assume 2'x P Channel) Channel Velocity = 6.09 ft/sec Segment Time = 0.74 minutes Segment 2: Concentrated Flow Length = 202 ft Height = 15 ft Slope = 0.0743 ft/ft Paved ? = No Velocity = 4.40 ft/sec Segment Time = 0.77 minutes Time of Concentration = 13.39 minutes SCS Lag Time = 8.03 minutes (SCS Lag = 0.6* Tc) Time Increment = 2.33 minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre development - Subbctsin #3E- Onsite 12/6/2011 ' SCS CURVE NUMBERS Assume: HSG 'A' = 0.0% acres HSG'B' = 100.0% 0.00 } 0.00 HSG'C' = 0.0% Onsite wooded 55 - HSG'D'= 0.0% Assume_ good condition Cover Condition Oi _00 ^0.00_ Comments SCS CN - ._�.. Impervious� _.._ TM6� 98 _e.-_.__.____ Open 1? Assume good condition _._.__...__Wooded_ 55 Assume good condition s.. Assume 38 %Impervious II. PRE - DEVELOPMENT - A. Watershed Breakdown Contributing Area SCS CN Area [acres] acres Comments Onsite impervious 98 Onsite open t 61 0.00 } 0.00 - Assume good condition_ v_ Onsite wooded 55 - 8.20 �� Assume_ good condition Onsite pones nd 100 Oi _00 ^0.00_ W Offsite impervious _ 98 � � � v Offsite open 61 0.00 Assume good condition Offsite wooded 55 _ Offsite_ 1/4 Ac Resid_. Lots ! 75� ! 0.00 0.00 Assume good condition Assume 38% Impervious d ite s pond _^ 100 i 0.00 - Total area = 8.20 acres 0.0128 sq.mi. Composite SCS CN = 55 % Impervious = 0.0% B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 196 ft Height= 1.1 ft Height= 30.9 ft Slope = 0.0110 ft/ft Slope = 0.1577 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 6.41 ft/sec Segment Time = 26.15 minutes Segment Time = 0.51 minutes Segment 3. Channel Flow Segment 4: Channel Flow Length = 406 ft Length = 506 ft Height = 29.6 ft Height = 14.37 ft Slope = 0.0729 ft/ft Slope = 0.0284 ft/ft Manning's n = 0.045 Natural Channel Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume 2'x 1' Channel) Flow Area = 6.00 sf (Assume Tx 2' Channel) Wetted Perimeter = 4.00 ft (Assume 2'x 1' Channel) Wetted Perimeter= 7.00 ft (Assume Tx 2' Channel) Channel Velocity = 5.63 ft/sec Channel Velocity = 5.03 ft/sec Segment Time = 1.20 minutes Segment Time = 1.67 minutes NEW HILL PLACE HYDROLOGIC CALCULATIONS S. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin #3E- Onsite 12/6/2011 Time of Concentration = 29.54 minutes I SCS Lag Time = 17.72 minutes (SCS Lag= 0.6* Tc) Time Increment = 5.14 minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS, B. IHNATOLYA, PE KRG -I 1000 Pre - development - Subbasin #3E- Offsite 12/6/2011 SCS CI'R%'E NUMBERS Assume: HSG'A' = 0.0% HSG'B' = 100.0% HSG 'C' = 0.0% HSG'D'= 0.0% Cover Condition SCS CN Comments Impervious __ v 98 Open 61 ! Assume good condition Wooded 55 Assume good condition 1/4 Ac. Resid. Lots _ 75 Assume 3 8% Impervious It. PRE - DEVELOPMENT A. Watershed Breakdown Contributing Area i SCS CN Area [acres] ' Comments Onsite impervious !� 8 i 0.00 Composite SCS CN = Onsite open � 61_ % Impervious = 0.00 Assume.g&ood condition _ Onsite wooded'---- Onsite pond 55 100 0.00 0.00 Assume good condition ***Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow �1.35�~ Offsite impervious m - -�` 98 ft Length = 229 Height = Offsite open_ ft 61� 26.3 Slope = 4.61 Assume good condition Offsite wooded _ 55 0.40 Woods - Light Underbrush � 1.31 I Assume good condition Offsite 1/4 Ac Resid. Lots 75 _ 5.47 3.88_ i - -� Assume 38% Impervious _ �Offsite pond Segment Time = 100 Segment 3a- Channel Flow 0.00 1 - Total area = 11.15 acres 0.0174 sq.mi. Composite SCS CN = 70 % Impervious = 12.1% B. Time of Concentration Information ***Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 229 Height = 6.3 ft Height = 26.3 Slope = 0.0630 ft/ft Slope = 0.1148 Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 5.47 Segment Time = 13.01 minutes Segment Time = 0.70 Segment 3a- Channel Flow - Segment ¢ Channel -Flow Length = 253 ft Length = 367 Height = 14.7 R Height = 2.2 Slope = 0.0581 ft/ft Slope = 0.0060 Manning's n = 0.045 Natural Channel Manning's n = 0.045 Flow Area = 2.00 sf (Assume Tx 1' Channel) Flow Area = 2.00 Wetted Perimeter = 4.00 ft (Assume 2'x I' Channel) Wetted Perimeter = 4.00 Channel Velocity = 5.03 ft/sec Channel Velocity = 1.61 Segment Time = 0.84 minutes Segment Time = 3.79 ft ft ft/ft ft/sec minutes ft ft ft/ft Natural Channel sf (Assume 2'x 1' Channel) ft (Assume 2'x 1' Channel) ft/sec minutes NEW HILL PLACE HYDROLOGIC CALCULATIONS KRG -11000 Pre- development - Subbasin #3E- Offsite Segment 5: Channel Flow Length = 169 ft Height = 16.3 ft Slope = 0.0964 ft/ft Manning's n = 0.013 Assume 18" RCP Culvert Flow Area = 1.77 sf (Assume 18" RCP) Wetted Perimeter = 4.71 ft (Assume 18" RCP) Channel Velocity = 18.52 ft/sec Segment Time = 0.15 minutes Time of Concentration = 18.49 minutes SCS Lag Time = 11.09 minutes (SCS Lag = 0.6* Tc) Time Increment = 3.22 minutes (= 0.29 *SCS Lag) B. IHNATOLYA, PE 12/6/2011 NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre - development - Subbasin #4 12/6/2011 I- SCS CURVE NUMBERS HSG { Impervious E Open { wooded A 1 98 1 39 { 30 B 98 -� 55 C_ 98 1 74 { 70 Onsite pond 1 100 . w 8-0 7rf Assume: HSG'A' = 0.0% . 0 HSG'B' = 100.0% HSG'C'= 0.0% HSG'D'= 0.0% Cover Condition SCS CN Comments Impervious _ _._ 98 j Open w- _ 61 Assume good condition m __.. Wooded { 55 Assume g000d d c co6 nditi___ on Ii. PRE -DEN ELOPMEN-T A. Watershed Breakdown Contributing Area S SCS CN ( ( Area [acres] 1 Comments � E Onsite impervious 9 98 0 0.00 _--g---c- Onsite 61 0 0.00 Assume ood ondition Onsite wooded 5 55_ t t 2.62 _ Onsite pond 1 100 . _i _ A _ O - 98 J . 0 _ _Offsite open _� 61 0.00 1 Assume Offsite wooded 55 i 0.17 1 Assume Offsite pond -. -__. 1 100 t- - °0.00 ... Total area = 2.79 acres 0.0044 sq.mi. Composite SCS CN = 55 % Impervious = 0.0% B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Length = 100 ft Height = 4.4 ft Slope = 0.0440 ft/ft Manning's n = 0.40 Woods - Light Underbrush P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Segment Time = 15.02 minutes Segment 3: Channel Flow Length = 365 ft Height- - 22 76 - ft- Slope = 0.0619 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume Tx 1' Channel) Wetted Perimeter = 4.00 ft (Assume 2'x I' Channel) Channel Velocity = 5.19 ft/sec Segment Time = 1.17 minutes )d condition Segment 1: Concentrated Flow Length = 117 ft Height= 10.7 ft Slope = 0.0915 ft/ft Paved ? = No Velocity = 4.88 ft/sec Segment Time = 0.40 minutes Time of Concentration = 16.59 minutes SCS Lag Time = 9.96 minutes (SCS Lag= 0.6* Tc) Time Increment = 2.89 minutes (= 0.29 *SCS Lag) )d condition Segment 1: Concentrated Flow Length = 117 ft Height= 10.7 ft Slope = 0.0915 ft/ft Paved ? = No Velocity = 4.88 ft/sec Segment Time = 0.40 minutes Time of Concentration = 16.59 minutes SCS Lag Time = 9.96 minutes (SCS Lag= 0.6* Tc) Time Increment = 2.89 minutes (= 0.29 *SCS Lag) Time of Concentration = 16.59 minutes SCS Lag Time = 9.96 minutes (SCS Lag= 0.6* Tc) Time Increment = 2.89 minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre- development - Subbasin #5- Onsite 12/6/2011 { SCS CL'R4'E NL`MBERS SCS CN I Area [acres] C Comments 9_8r, 0.00 3G _ O impervious pen ooded A .. - e _...,... i 98 -t, --39 30 ~ 100 0.00 _ _ Offsite impervious 9 98 0.00 B _ �] _ 98 61 55 C 98 ; 74 D _. 98 _ j 80 Assume: HSG'A' = 0.0% HSG 'B' = 100.0% HSG'C' = 0.0% HSG'D'= 0.0% Cover Conon i SCS CN Comments _ - Impervious 98 -_ Open 61 Assume good condition Wooded 55 1 Assume good condition -� 1/4 Ac. Resid. Lots - 75 Assume 38% Impervious II. PRE- DEVELOPIbiENT A. Watershed Breakdown Contributing Area S SCS CN I Area [acres] C Comments 9_8r, 0.00 u _ O 61 I um _ 0 -7.68 �I A Assume good -condition�w� Onsite pond 1 100 0.00 _ _ Offsite impervious 9 98 0.00 _ �] _ _ _ Total area = 7.68 acres 0.0120 sq.mi. Composite SCS CN = 55 % Impervious = 0.0% B. Time of Concentration Information ***Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Length = 100 ft Height = 6.3 ft Slope = 0.0630 ft/ft Manning's n = 0.40 Woods - Light Under P (2- year /24 -hour) = 3.48 inches (Wake County Segment Time = 13.01 minutes Segment 3. Channel F low - Length = 429 ft Height = 17.9 ft Slope = 0.0417 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume 2'x 1' Ch Wetted Perimeter = 4.00 ft (Assume 2'x I' Ch; Channel Velocity = 4.26 ft/sec Segment Time = 1.68 minutes Segment 2: Concentrated Flow Length = 260 Height= 26.5 Slope = 0.1019 rush Paved ? = No NC) Velocity = 5.15 Segment Time = 0.84 Segment 4: Channel Flow - - Length = 389 Height = 11.8 Slope = 0.0303 Manning's n = 0.045 nnel) Flow Area = 6.00 nnel) Wetted Perimeter= 7.00 Channel Velocity = 5.20 Segment Time = 1.25 ft It ft/ft ft/sec minutes It ft ft/ft Natural Channel sf (Assume Y x 2' Channel) ft (Assume Y x 2' Channel) ft/sec minutes Segment 2: Concentrated Flow Length = 260 Height= 26.5 Slope = 0.1019 rush Paved ? = No NC) Velocity = 5.15 Segment Time = 0.84 Segment 4: Channel Flow - - Length = 389 Height = 11.8 Slope = 0.0303 Manning's n = 0.045 nnel) Flow Area = 6.00 nnel) Wetted Perimeter= 7.00 Channel Velocity = 5.20 Segment Time = 1.25 ft It ft/ft ft/sec minutes It ft ft/ft Natural Channel sf (Assume Y x 2' Channel) ft (Assume Y x 2' Channel) ft/sec minutes ft It ft/ft ft/sec minutes It ft ft/ft Natural Channel sf (Assume Y x 2' Channel) ft (Assume Y x 2' Channel) ft/sec minutes NEW HILL PLACE HYDROLOGIC CALCULATIONS s. IHNATOLYA, PE KRG -11000 Pre - development - Subbasin #S- Onsite 12/6/2011 Time of Concentration = 16.78 minutes SCS Lag Time = 10.07 minutes (SCS Lag = 0.6* Tc) Time Increment = 2.92 minutes (= 0.29 *SCS Lag) NEW HILL PLACE HYDROLOGIC CALCULATIONS B. IHNATOLYA, PE KRG -11000 Pre - development - Subbasin 45- Offsite 12/6/2011 SCS CURVE NUMBERS HSG Impervious { Open Wooded 1/4 Ac. Resid Lots A 98 ' I 39 k 30 61 B 98 1 61 j 55 75 C 98 74 70 83 D 98 I! 80 77 87 Assume: HSG'A'= 0.0% 0.00 - HSG 'B' = 100.0% 1.06 - HSG'C'= 0.0% 3.46 Assume good condition HSG 'D' = 0.0% 1.91 Assume good condition Cover Condition SCS CN } Comments Assume 38% Impervious Impervious 98 - - Open 61 Assume good condition Height = Wooded 55 Assume good condition ft/ft 1/4 Ac. Resid. Lots 75 { Assume 38% Impervious 0.045 H. PRE - DEVELOPMENT A. Watershed Breakdown Segment 2: Concentrated Flow Contributing Area SCS CN Area [acres] acres � Comments Onsite impervious 98 0.00 - Onsite open 61 0.00 Assume good condition Onsite wooded 55 0.00 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 1.06 - Offsite open 61 3.46 Assume good condition Offsite wooded 55 1.91 Assume good condition Offsite 1/4 Ac Resid. Lots 75 2.46 Assume 38% Impervious Offsite pond 100 0.00 - Total area = 8.89 acres Height = 6.9 0.0139 sq.mi. ft/ft Composite SCS CN = 68.0 Manning's n = 0.045 % Impervious = 11.9% 0.013 Flow Area = B. Time of Concentration Information ***Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 182 Height = 4.9 ft Height = 25.9 Slope = 0.0490 ft/ft Slope = 0.1423 Manning's n = 0.24 Dense Grasses Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 6.09 Segment Time = 9.56 minutes Segment Time = 0.50 f gment -3: Channel lylaw o° ^men• e. Chan .el- law Length = 117 ft Length = 166 Height = 9.3 It Height = 6.9 Slope = 0.0795 ft/ft Slope = 0.0416 Manning's n = 0.045 Natural Channel Manning's n = 0.013 Flow Area = 2.00 sf (Assume 2'x 1' Channel) Flow Area = 1.77 Wetted Perimeter = 4.00 ft (Assume 2'x F Channel) Wetted Perimeter = 4.71 Channel Velocity = 5.88 ft/sec Channel Velocity = 12.16 Segment Time = 0.33 minutes Segment Time = 0.23 ft ft ft/ft ft/sec minutes ft ft ft/ft Assume 18" RCP Culvert sf (Assume 18" RCP) ft (Assume 18" RCP) ft/sec minutes NEW HILL PLACE HYDROLOGIC CALCULATIONS KRG -11000 Pre- development - Subbasin #5- Offsite I Time of Concentration = 10.62 minutes SCS Lag Time = 6.37 minutes (SCS Lag = 0.6* Tc) Time Increment = 1.85 minutes (= 0.29 *SCS Lag) B. IHNATOLYA, PE 12/6/2011 NEW HILL PLACE REACHES B. IHNATOLYA, PE KRG -11000 12/6/2011 Ill, CHANNEL REACH DATA > Reach #1 Channel Flow Length = 157 ft Height= 1.9 ft Slope = 0.0121 ft/ft Manning's n = 0.045 Natural Channel Flow Area= 20.00 sf (Assume 5'x 4' Channel) Wetted Perimeter = 13.00 ft (Assume 5'x 4' Channel) Channel Velocity = 4.85 ft/sec Segment Time = 0.54 minutes Reach #1 Total Time = 0.54 minutes �_> Reacla #2 Channel Flow Length = 886 ft Height = 8.85 ft Slope = 0.0100 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 20.00 sf (Assume 5'x 4' Channel) Wetted Perimeter = 13.00 ft (Assume 5'x 4' Channel) Channel Velocity = 4.41 ft/see Segment Time = 3.35 minutes Reach #2 Total Time = 3.35 minutes => Reach #3 Channel Flow Length = 1076 ft Height = 11.1 ft Slope = 0.0103 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 20.00 sf (Assume 5'x 4' Channel) Wetted Perimeter = 13.00 ft (Assume 5'x 4' Channel) Channel Velocity = 4.48 ft/sec Segment Time = 4.00 minutes Reach #3 Total Time = 4.00 minutes Reach 94 Channel Flow Length = 26 ft Height = 0.5 ft Slope = 0.0192 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 20.00 sf (Assume 5'x 4' Channel) Wetted Perimeter = 13.00 ft (Assume 5'x 4' Channel) Channel Velocity = 6.12 ft/sec Segment Time = 0.07 minutes Reach #4 Total Time = 0.07 minutes NEW HILL PLACE Length = REACHES RRG -11000 Height = (_> Reach #5 ft Channel Flow 0.0142 ft/ft Length = 155 ft Height = 2.5 ft Slope = 0.0161 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 20.00 sf (Assume 5'x 4' Channel) Wetted Perimeter = 13.00 ft (Assume 5'x 4' Channel) Channel Velocity = 5.60 f ✓sec Segment Time = 0.46 minutes I Reach #5 Total Thne = 0.46 minutes _> Reach #6 Channel Flow 13 IHNATOLYA, PE 12/6/2011 Length = 241 ft Height = 3.42 ft Slope = 0.0142 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 20.00 sf (Assume 5'x 4' Channel) Wetted Perimeter = 13.00 It (Assume 5' x 4' Channel) Channel Velocity = 5.26 ft/sec Segment Time = 0.76 minutes Reach #6 Total Time = 0.76 minutes 1_> Reach #7 Channel Flow Length = 302 ft Height= 6.74 ft Slope = 0.0223 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume Tx 3' Channel) Wetted Perimeter = 10.00 ft (Assume 4'x Y Channel) Channel Velocity = 5.59 ft/sec Segment Time = 0.90 minutes Reach #7 Total Time = 0.90 minutes !_> Reach #8 Channel Flow Length = 568 ft Height = 13.92 ft Slope = 0.0245 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume Tx Y Channel) Wetted Perimeter = 10.00 ft (Assume Tx 3' Channel) Channel Velocity = 5 85 ft/sec Segment Time = 1.62 minutes Reach #8 Total Time = 1.62 minutes 13 IHNATOLYA, PE 12/6/2011 NEW HILL PLACE ft 4.8 REACHES KRG -11000 ft/ft 0.045 Natural Channel _> Reach #9 sf (Assume 4'x 4' Channel) 12.00 ft (Assume 4'x 4' Channel) Channel Flow ft/sec Length = 692 ft Height= 15.74 ft Slope = 0.0227 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume 4'x 3' Channel) Wetted Perimeter = 10.00 It (Assume 4' x 3' Channel) Channel Velocity = 5.64 ft/sec Segment Time = 2.05 minutes Reach #9 Total Time = 2.05 minutes _> Reach #10 Channel Flow Length = Height = Slope = Manning's n = Flow Area= Wetted Perimeter = Channel Velocity = Segment Time = Reach #10 Total Time = I_> Reach 911 1 Segment 5: Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Segment 6: Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Reach #11 Total Time = 503 ft 4.8 ft 0.0095 ft/ft 0.045 Natural Channel 16.00 sf (Assume 4'x 4' Channel) 12.00 ft (Assume 4'x 4' Channel) 3.92 ft/sec 2.14 minutes 234 minutes 1131 ft 50.2 ft 0.0444 ft/ft 0.045 Natural Channel 4.00 sf (Assume 2'x 2' Channel) 6.00 ft (Assume 2'x 2' Channel) 5.32 ft/sec 3.54 minutes 398 ft 8.89 ft 0.0223 ft/ft 0.045 Natural Channel 12.00 sf (Assume T x3' Channel) 10.00 ft (Assume Tx Y Channel) 5.59 ft/sec 139 minutes 960 ft 15.91 ft 0.0166 ft/ft 0.045 Natural Channel 16.00 sf (Assume 4'x 4' Channel) 12.00 ft (Assume 4'x 4' Channel) 5.16 ft/sec 3.10 minutes 7.83 minutes I B. IHNATOLYA, PE 12/6/2011 NEW HILL PLACE REACHES KRG -11000 => Reach #12 ft 1.7 Channel Flow 0.0153 ft/ft Length = 58 ft Height = 1 ft Slope = 0.0172 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 20.00 sf (Assume 5'x 4' Channel) Wetted Perimeter = 13.00 ft (Assume 5'x 4' Channel) Channel Velocity = 5.79 ft/sec Segment Time = 0.17 minutes Reach #12 Total Time = 0.17 minutes _> Reach #13 Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Reach #13 Total Time = —Reach #14 Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Reach #14 Total Time = _> Reach #15 Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = 111 ft 1.7 ft 0.0153 ft/ft 0.045 Natural Channel 20.00 sf (Assume Y x 4' Channel) 13.00 ft (Assume 5'x T Channel) 5.46 ft/sec 0.34 minutes 0.34 minutes 263 ft 3.7 ft 0.0141 ft/ft 0.045 Natural Channel 20.00 sf (Assume 5' x 4' Channel) 13.00 ft (Assume Tx 4' Channel) 5.23 ft/sec 0.84 minutes 0.84 minutes 394 ft 4.59 ft 0.0116 ft/ft 0.045 Natural Channel 12.00 sf (Assume 4' x 3' Channel) 10.00 ft (Assume 4'x Y Channel) 4.04 fusee Segment Time = 1.63 minutes Reach #15 Total Time = 1.63 minutes B. IHNATOLYA, PE 12/6/2011 NEW HILL PLACE ft 20.77 REACHES KRG -11000 ft/ft 0.045 Natural Channel (_> Reach #16 sf (Assume Y x 2' Channel) 7.00 It (Assume Y x 2' Channel) Channel Flow ft/sec Length = 774 ft Height = 14.6 ft Slope = 0.0189 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume 4'x Y Channel) Wetted Perimeter = 10.00 It (Assume 4'x Y Channel) Channel Velocity = 5.14 ft/sec Segment Time = 2.51 minutes Reach 06 Total Time = 2.SI minutes 4 => Reach #17 Channel Flow Length = 877 ft Height= 17.63 ft Slope = 0.0201 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume 4'x 3' Channel) Wetted Perimeter = 10.00 ft (Assume 4'x Y Channel) Channel Velocity = 5.30 ft/sec Segment Time = 2.76 minutes Reach #17 Total Time = 2.76 minutes _> Reach #18 Channel Flow Length = 730 ft Height = 10.65 ft Slope = 0.01.46 Rift Manning's n = 0.045 Natural Channel Flow Area = 16.00 sf (Assume 4'x 4' Channel) Wetted Perimeter = 12.00 ft (Assume 4'x 4' Channel) Channel Velocity = 4.84 ft/sec Segment Time = 2.51 minutes Reach #18 Total Time = 2.51 minutes I �= >Reach #19 Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Reach #19 Total Time = 608 ft 20.77 ft 0.0342 ft/ft 0.045 Natural Channel 6.00 sf (Assume Y x 2' Channel) 7.00 It (Assume Y x 2' Channel) 5.52 ft/sec 1.84 minutes 1.84 minutes B. IHNATOLYA, PE 12/6/2011 NEW HILL PLACE REACHES KRG -11000 Reach #J. 0 Channel Flow Length = 481 ft Height = 25.6 ft Slope = 0.0532 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 4.00 sf (Assume 2'x 2' Channel) Wetted Perimeter = 6.00 ft (Assume 2'x 2' Channel) Channel Velocity = 5.83 ft/sec Segment Time = 1.38 minutes Channel Flow Length = 389 It Height = 11.8 ft Slope = 0.0303 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 6.00 sf (Assume Y x 2' Channel) Wetted Perimeter = 7.00 ft (Assume Y x 2' Channel) Channel Velocity = 5.20 ft/sec Segment Time = 1.25 minutes Reach #20 Total Time'-- 2.62 minutes _> Reach #21 Channel Flow Length = 960 ft Height = 15.91 ft Slope = 0.0166 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 16.00 sf (Assume 4'x 4' Channel) Wetted Perimeter = 12.00 ft (Assume 4'x 4' Channel) Channel Velocity = 5.16 ft/sec Segment Time = 3.10 minutes Reach #21 Total Time = 3.10 minutes B. IHNATOLYA, PE 12/6/2011 POA al P�OHA gFgCq ��II11 z _ _ y _ n SUB01A T SU8018 J -3 GµA REq 0.� CH5 FMA SUB01C ¢ JE SUB010 SUB01H SUB011 Scenario: Pre MA #2 0.�OH'5 gFACH.' 0 4 SUB02A SUB02B SUB02C- OFFSITE SUB02C- ONSITE POA #3 0.FACH_t2 REACH -73 y _ _ SUB03A > SUB030 J -13 POA Nd An SUBOa POA 05 9� 9Cy 0 SUB05 -0NSITF SU805-0FFSITE Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i KRG11000.ppc Center [08.11.01.51] 1218/2011 27 Siemon Company Drive Suite 200 W Page 1 of 1 Watertown, CT 06795 USA +1- 203 - 755 -1666 Subsection: Master Network Summary Catchments Summary 0.84 Label Scenario Return 1.10 728.000 Event 730.000 0.16 (years) SUB01A Pre 1 year 1 SUB01A Pre 100 year 100 SUB01B Pre 1 year 1 SU13O16 Pre 100 year 100 SU601C Pre 1 year 1 SUB01C Pre 100 year 100 SUB01D Pre 1 year 1 SUB01D Pre 100 year 100 SUBOlE Pre 1 year 1 SUB01E Pre 100 year 100 SUB01F Pre 1 year 1 SUB01F Pre 100 year 100 SUB01G Pre 1 year 1 SUB01G Pre 100 year 100 SUB01H Pre 1 year 1 SUB01H Pre 100 year 100 SUB01I Pre 1 year 1 SUB01I Pre 100 year 100 SUB02A Pre 1 year 1 SUB02A Pre 100 year 100 SUB02B Pre 1 year 1 SUB02B Pre 100 year 100 SUB02C- OFFSITE Pre 1 year 1 SUB02C- OFFSITE Pre 100 year 100 SUB03A Pre 1 year 1 SUB03A Pre 100 year 100 SUB03B Pre 1 year 1 SUB03B Pre 100 year 100 SUB03C Pre 1 year 1 SUB03C Pre 100 year 100 SUB03D Pre 1 year 1 SUB03D Pre 100 year 100 SUB03E- OFFSITE Pre 1 year 1 SUB03E- OFFSITE Pre 100 year 100 SUB04 Pre 1 year 1 SUB04 Pre 100 year 100 SUB05- ONSITE Pre 1 year 1 SUB05- ONSITE Pre 100 year 100 SUB02C- ONSITE Pre 1 year 1 - SUBO2C�NS-ITE-- - Pre-t00 -yea 00- SUB03E-ONSITE Pre 1 year 1 SUB03E -ONSrM Pre 100 year 100 SUB05- OFFSITE Pre 1 year 1 SUB05- OFFSITE Pre 100 year 100 Hydrograph Volume (ac -ft) 0.187 2.606 0.134 1.228 0.022 0.225 0.017 0.138 0.139 1.787 0.074 0.557 0.209 3.192 0.312 3.453 0.580 6.913 0.096 1.328 0.116 1.199 0.420 2.652 0.013 0.198 0.007 0.106 0.269 4.106 0.045 0.685 0.603 3.815 0.038 0.582 0.105 1.601 0.375 4-1-- 0.111 1.704 0.421 2.883 Time to Peak Peak Flow (min) (ft3 /s) 758.000 0.84 736.000 19.75 731.000 1.10 728.000 13.19 730.000 0.16 726.000 2.61 728.000 0.18 726.000 1.62 758.000 0.67 737.000 13.86 728.000 0.91 725.000 6.76 758.000 0.92 734.000 25.86 755.000 1.71 732.000 29.93 758.000 2.93 737.000 54.31 753.000 0.52 728.000 13.98 734.000 0.73 729.000 12.00 727.000 5.90 725.000 32.38 752.000 0.07 725.000 2.33 753.000 0.04 727.000 1.15 757.000 1.21 734.000 34.45 753.000 0.23 728.000 7.14 732.000 6.52 730.000 37.54 754.000 0.19 730.000 5.57 754.000 0.52 730.000 15.19 756.000 1.88 7 -34:000- 760.000 0.45 740.000 12.36 727.000 5.62 725.000 35.50 Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i KRG11000.ppc Center [08.11.01.51] 12/8/2011 27 Siemon Company Drive Suite 200 W Page 1 of 3 Watertown, CT 06795 USA +1- 203 - 755 -1666 Subsection: Master Network Summary Node Summary Label Scenario Return Hydrograph Time to Peak Peak Flow Event Volume (min) (ft3 /s) (years) (ac -ft) POA #1 Pre 1 year 1 1.667 759.000 8.29 POA #1 Pre 100 year 100 20.061 741.000 156.81 Pre 1 year 1 0.134 731.000 1.10 Pre 100 year 100 1.228 728.000 13.19 3-3 Pre 1 year 1 1.351 757.000 6.79 J -3 Pre 100 year 100 16.252 737.000 128.84 J -6 Pre 1 year 1 1.313 757.000 6.60 3-6 Pre 100 year 100 15.895 736.000 126.42 Pre 1 year 1 0.139 758.000 0.67 Pre 100 year 100 1.787 737.000 13.86 Pre 1 year 1 0.074 728.000 0.91 Pre 100 year 100 0.557 725.000 6.76 J -9 Pre 1 year 1 0.892 755.000 4.64 J -9 Pre 100 year 100 10.366 735.000 83.14 POA #2 Pre 1 year 1 1.004 736.000 7.69 POA #2 Pre 100 year 100 9.987 734.000 93.92 Pre 1 year 1 0.096 753.000 0.52 Pre 100 year 100 1.328 728.000 13.98 Pre 1 year 1 0.116 734.000 0.73 Pre 100 year 100 1.199 729.000 12.00 Pre 1 year 1 0.420 727.000 5.90 Pre 100 year 100 2.652 725.000 32.38 POA #3 Pre 1 year 1 1.046 738.000 7.23 POA #3 Pre 100 year 100 10.600 736.000 90.83 J -13 Pre 1 year 1 1.027 737.000 7.16 J -13 Pre 100 year 100 10.298 735.000 88.75 Pre 1 year 1 0.013 752.000 0.07 Pre 100 year 100 0.198 725.000 2.33 Pre 1 year 1 0.007 753.000 0.04 Pre 100 year 100 0.106 727.000 1.15 Pre 1 year 1 0.269 757.000 1.21 Pre 100 year 100 4.106 734.000 34.45 Pre 1 year 1 0.045 753.000 0.23 Pre 100 year 100 0.685 728.000 7.14 Pre 1 year 1 0.603 732.000 6.52 Pre 100 year 100 3.815 730.000 37.54 POA #4 Pre 1 year 1 0.038 754.000 0.19 POA #4 Pre 100 year 100 0.582 730.000 5.57 POA #5 Pre 1 year 1 0.526 730.000 5.75 - Pre - 100 -yea, X00- 4. -482- 728 000- 50.32 - Pre 1 year 1 0.187 758.000 0.84 Pre 100 year 100 2.606 736.000 19.75 Pre 1 year 1 0.022 730.000 0.16 Pre 100 year 100 0.225 726.000 2.61 Pre 1 year 1 0.017 728.000 0.18 Bentley Systems, Inc. Haestad Methods Solution Bentley PondPack V8i KRG 11000. ppc Center [08.11.01.51] 12/812011 27 Siemon Company Drive Suite 200 W Page 2 of 3 Watertown, CT 06795 USA +1- 203 - 755 -1666 Subsection: Master Network Summary Node Summary Label Scenario J -10 J -10 Pre 100 year Pre 1 year Pre 100 year Pre 1 year Pre 100 year Pre 1 year Pre 100 year Return Hydrograph Time to Peak Peak Flow Event Volume (min) (ft3 /s) (years) (ac -ft) 100 0.138 726.000 1.62 1 0.714 734.000 6.61 100 5.516 733.000 48.40 1 0.421 727.000 5.62 100 2.883 725.000 35.50 1 0.375 756.000 1.88 100 4.821 734.000 39.62 Bentley Systems, Inc. aestad Methods Solution Bentley Pond Pack V8 KRG1 1000.ppc Center (08.11.01.51] 12/8/2011 27 Siemon Company Drive Suite 200 W Page 3 of 3 Watertown, CT 06795 USA +1 -203- 755 -1666 . �. I I .- I- I - - :1 1, '/ i _ 11 I I I ��_ � " . , - A - I - � �'. I 1 III I . 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POST - DEVELOPMENT HYDROLOGY CAL CULA TIONS HOLLY SPRINGS TC KRG -11010 HOLLY S GS TOWNE CENTER POST- DEVELOPME INPUT SUMMARY KRG- 11011, Summary of Results On -site Area [acres] Sub -basin ID d 1/4 Ac Open Wooded Impervious Pond Total Open ` Wooded j IA 0.50 6.97 0.72 0.00 I 8.19 0.00 0.00 1B 0.22 2.73 0.00 0.00 I 2.95 0.00 0.00 1C € 0.17 0.47 0.00 0.00 0.64 0.00 0.00 1D 0.24 0.10 0.00 0.00 0.34 0.00 0.00 i lE 0.26 7.54 0.12 0.00 7.92 0.00 0.00 1F -To SWMF 2 8.57 0.00 22.58 1.89 33.04 0.15 0.00 j 1F- Bypass 0.29 0.93 I 0.01 0.00 1.23 0.00 0.00 IG -To SWMF 8 3.67 1.92 1 3.03 0.28 I I 8.90 0.02 0.00 1G- Bypass 0.34 1.02 0.00 0.00 1.36 0.00 0.00 1H -To SWMF 1 1.85 0.00 , 6.04 0.40 8.29 0.31 I 0.00 1 H- Bypass 1.09 5.84 0.01 0.00 6.94 0.00 0.00 I 1.41 2.14 0.00 0.00 3.55 0.00 0.00 2A 0.12 1.98 0.00 0.00 I 2.10 0.00 0.00 2B 0.51 3.54 I 0.00 0.00 4.05 0.00 0.00 2C -To SWMF 3 3.29 0.00 13.21 0.77 17.27 1.51 0.03 2C -To SWMF 4 3.02 0.19 4.60 0.47 8.28 0.00 0.00 2C- Bypass - Onsite 1.17 2.16 0.09 I 0.00 3.42 0.00 0.00 I 2C- Bypass - Offsite 0.00 0.00 0.00 0.00 0.00 2.23 0.31 3A 0.82 0.53 0.00 0.00 1.35 0.00 I 0.00 3B 0.13 0.05 0.00 0.00 0.18 0.00 0.00 3C -To SWMF 5 5.29 3.64 9.27 0.51 18.71 0.00 0.00 3C- Bypass 0.92 0.66 I 0.00 I 0.00 I 1.58 0.00 0.00 3D -To SWMF 6 5.04 0.69 8.68 0.60 15.01 1.11 0.00 3D- Bypass 0.76 0.56 0.00 0.00 1 1.32 0.00 0.00 3E- Bypass - Onsite 1.41 0.81 0.00 0.00 2.22 0.00 0.00 3E- Bypass - Offsite 0.00 0.00 0.00 0.00 0.00 3.84 1.07 5- Onsite 1.53 0.39 0.00 0.00 I 1.92 0.00 0.00 5- Offsite 0.00 0.00 0.00 0.00 0.00 3.79 I 1.25 Unanalyzed Site Area 0.71 6.57 0.48 0.00 7.76 0.00 0.00 Totals = 43.33 51.43 68.84 4.92 168.52 12.96 2.66 Off -site Area [acres] 1/4 Ac 1 .EN, PE 1/28/2015 Total Area Curve Time of Pond I Total [acres] Number (min) 0.00 0.00 8.19 61 16.66 0.00 0.00 2.95 64 10.77 0.00 0.00 0.64 64 5.00 0.00 0.00 0.34 72 5.00 0.00 0.00 7.92 58 16.00 0.00 0.28 33.32 88 5.00 0.00 0.00 1.23 70 5.00 0.00 1.09 9.99 77 5.00 0.00 I 0.00 1.36 57 5.00 0.00 1.76 10.05 90 5.00 0.00 0.00 6.94 59 14.54 0.00 0.00 3.55 60 5.00 0.00 0.00 2.10 55 9.91 0.00 0.00 4.05 61 16.33 0.00 3.20 20.47 89 5.00 0.00 I 0.00 8.28 84 5.00 0.00 0.00 3.42 58 10.04 0.00 4.50 4.50 74 15.28 0.00 0.00 1.35 59 5.00 0.00 0.00 0.18 59 5.00 0.00 2.28 20.99 79 5.00 0.00 0.00 1.58 58 5.00 0.00 2.64 17.65 83 5.00 0.00 0.00 1.32 58 5.00 0.00 0.00 2.22 59 5.00 0.00 9.07 9.07 70 17.69 0.00 0.00 1.92 60 5.00 0.00 10.26 10.26 71 10.62 0.00 0.00 7.76 - -- - -- 0.00 I 35A8 203.60 0.00 0.00 0.18 59 5.00 0.00 2.28 20.99 79 5.00 0.00 0.00 1.58 58 5.00 0.00 2.64 17.65 83 5.00 0.00 0.00 1.32 58 5.00 0.00 0.00 2.22 59 5.00 0.00 9.07 9.07 70 17.69 0.00 0.00 1.92 60 5.00 0.00 10.26 10.26 71 10.62 0.00 0.00 7.76 - -- - -- 0.00 I 35A8 203.60 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 1A I. SCS CURVE NUMBERS HSG Impervious A 98 B 98 Open Wooded 39 30 61 55 C SCS CN 98 74 70 D 98 98 80 77 Onsite open Assume. HSG'A'= 0.0% Onsite wooded 57 HSG B'= 92.3% Onsite pond 100 HSG'C'= 0.0% Offsite impervious 98 HSG D'= 7.7% Offsite open Cover Condition SCS CN _ Comments- impervious 57 98 Assume good condition Offsite pond Open 0.00 62 Total area = Assume good condition Wooded 57 0.0128 Assume good condition 11. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.72 - Onsite open 62 0.50 Assume good condition Onsite wooded 57 6.97 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 62 0.00 Assume good condition _ Offsite wooded 57 0.00 Assume good condition Offsite pond 100 0.00 Total area = 8.19 acres 0.0128 sq.mi. Composite SCS CN = 61 % Impervious = 8.8% J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin IA B. Time of Concentration Information ** *Time ofconcentration is calculated using the SCS Segmental Approach (TR -SS) Segment 1: Overland Flow It 0.3 Length = 86 ft Height = 2.68 ft Slope = 0.0312 ft/ft Manning's n = 0.36 Woods/Dense Grass /Imp. P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Segment Time = 14.05 minutes Segment 3: Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity= Segment Time = 41 It 0.3 ft 0.0073 ft/ft 0.013 RCP 1.77 sf (Assume 18" RCP) 4.71 ft (Assume 18" RCP) 5.10 ft/sec 0.13 minutes Time of Concentration = 16.66 SCS Lag Time = 10.00 Time Increment = 2.90 Segment 2: Channel Flow Length = 488 Height = 15.8 Slope = 0.0324 Manning's n = 0.012 Flow Area = 0.25 Wetted Perimeter= 1.50 Channel Velocity= 6.77 Segment Time = 1.20 Segment 4: Channel Flow Length = 445 Height = 34.54 Slope = 0.0776 Manning's n = 0.045 Flow Area = 2.00 Wetted Perimeter= 4.00 Channel Velocity= 5.81 Segment Time = L28 minutes minutes (SCS Lag = 0.6* Tc) minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 ft ft ft/ft Concrete Gutter sf (Assume 0.5'x 1' Gutter) ft (Assume 0.5'x 1' Gutter) ft/sec minutes ft ft ft/ft Natural Channel sf (Assume 2'x 1' Channel) ft (Assume 2'x 1' Channel) ft/sec minutes HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 1B 8/21/2014 I. SCS CURVE NUMBERS HSG Impervious Open Wooded A 98 39 30 B 98 61 55 C _ — – 98 74 70 D -- 98 80 77 Assume: HSG'A' = 0.0% HSG'B'= 59.0% HSG'C' = 0.0% HSG'D' = 41.0% Cover Condition SCS CN Comments Impervious 98 - Open 69 Assume good condition Wooded 64 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area Onsite impervious Onsite open Onsite wooded Onsite pond Offsite impervious Offsite open Offsite wooded Offsite pond SCS CN Area [acres] Comments 98 0.00 69 0.22 Assume good condition 64 2.73 Assume good condition 100 0.00 98 0.00 69 0.00 Assume good condition 64 0.00 Assume good condition 100 0.00 - Total area = Composite SCS CN = % Impervious = 2.95 acres 0.0046 sq.mi. 64 0.0% HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin IB B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). J. ALLEN, PE 8/21/2014 Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 167.3 ft Height = 11.1 ft Height = 31.7 ft Slope = 0.1110 ft/ft Slope = 0.1895 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 7.02 ft/sec Segment Time = 10.37 minutes Segment Time = 0.40 minutes Time of Concentration = 10.77 minutes SCS Lag Time = 6.46 minutes (SCS Lag = 0.6* Tc) Time Increment = 1.87 minutes (= 0.29 *SCS Lag) HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin IC 8/21/2014 I. SCS CURVE NUMBERS - HSG Impervious - Open Wooded A - 98 - 39 30 B 98 61 55 C 98 74 70 D 98 80 77 Assume: HSG'A'= 0.0% HSG'B' = 65.6% HSG'C' = 0.0% HSG'D' = 34.4% Cover Condition SCS CN Comments Impervious 98 - Open 68 Assume good condition Wooded 63 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.00 - Onsite open 68 0.17 Assume good condition Onsite wooded 63 0.47 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 68 0.00 Assume good condition Offsite wooded 63 0.00 Assume good condition Offsite pond 100 0.00 - Total area = 0.64 acres 0.0010 sq.mi. Composite SCS CN = 64 % Impervious = 0.0% HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin IC 8/21/2014 B. Time of Concentration Information Time of concentration was conservatively assumed to be S minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) = 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) ; HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 1D 8/21/2014 I. SCS CURVE NUMBERS HSG Impervious Open Wooded A 98 39 30 B 98 61 55 C 98 74 70 D 98 80 77 Assume: HSG'A'= 0.0% HSG'B' = 38.2% HSG'C'= 0.0% HSG'D' = 61.8% Cover Condition SCS CN Comments Impervious 98 — Open 73 Assume good condition Wooded 69 Assume good condition I1. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area Onsite impervious Onsite open Onsite wooded Onsite pond Offsite impervious Offsite open Offsite wooded Offsite pond SCS CN Area [acres] 3 Comments 98 0.00 - 73 0.24 Assume good condition _ 69 0.10 Assume good condition 100 0.00 - 98 0.00 - 73 0.00 Assume good condition 69 0.00 Assume good condition 100 0.00 - Total area = Composite SCS CN = % Impervious = 0.34 acres 0.0005 sq.mi. 72 0.0% HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin ID 8/21/2014 B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 1E L SCS CURVE NUMBERS HSG SCS CN Impervious Open Wooded A — -- 98 39 30 B 62 98 61 55 C 57 98 74 70 D 100 98 80 77 Offsite impervious 98 0.00 Assume. HSG'A'= 0.0% 0.00 Assume good condition HSG'B'= 92.3% 0.00 Assume good condition HSG'C' = 0.0% 0.00 HSG'D' = 7.7% acres Cover Condition 0.0124 SCS CN Comments Impervious 58 98 - Open 1.5% 62 Assume good condition Wooded 57 Assume good condition 11. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area jacresl Comments Onsite impervious 98 0.12 Onsite open 62 0.26 Assume good condition Onsite wooded 57 7.54 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 62 0.00 Assume good condition Offsite wooded 57 0.00 Assume good condition Offsite pond 100 0.00 Total area = 7.92 acres 0.0124 sq.mi. Composite SCS CN = 58 % Impervious = 1.5% J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin IE B. Time of Concentration Information ** *Time ofconcentration is calculated using the SCSSegmental Approach (TR -55) Segment 1: Overland Flow Length = 218 It Length = 100 ft Height = 4.2 ft Slope = 0.0420 ft/ft Manning's n = 0.34 Dense Grass /Wooded P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Segment Time = 13.44 minutes Segment 3: Channel Flow Length = 563 ft Height = 31.2 ft Slope = 0.0554 ft/ft Manning's n = 0.045 Natural Channel Plow Area = 2.00 sf (Assume 2'x 1' Channel) Wetted Perimeter = 4.00 It (Assume 2'x 1' Channel) Channel Velocity = 4.91 ft/sec Segment Time = 1.91 minutes Time of Concentration = 16.00 SCS Lag Time = 9.60 Time Increment = 2.78 Segment 2: Concentrated Flow Length = 218 It Height = 25.8 ft Slope = 0.1183 ft/ft Paved ? = No Velocity = 5.55 ft/sec Segment Time = 0.65 minutes minutes minutes (SCS Lag = 0.6* Tc) minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin IF-To SWMF 2 I. SCS CURVE NUMBERS HSG Impervious Open Wooded A 98 39 30 B 98 61 55 C — 98 74 70 D - — 98 80 77 Assume. HSG'A'= 0.0% HSG'B'= 100.0% HSG'C'= 0.0% HSG'D' = 0.0% Cover Condition SCS CN Comments Impervious 98 - Open 61 Assume good condition Wooded 55 Assume good condition II. POST - DEVELOPMENT Im A. Watershed Breakdown Contributing Area Onsite impervious Onsite open SCS CN 98 61 Area [acresi 22.58 8.57 Comments Assume good condition i Onsite wooded Onsite pond 55 100 0.00 1.89 Assume good condition - Offsite impervious 98 0.13 _ Offsite open 61 0.15 Assume good condition Offsite wooded 55 0.00 Assume good condition Offsite pond 100 0.00 - Total area = 33.32 acres 0.0521 sq.mi. Composite SCS CN = 88 % Impervious = 68.2% J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin IF -To SWMF2 B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 1F- Bypass I. SCS CURVE NUMBERS SCS CN Area [acres] Comments HSG 98 Impervious Open Wooded A 73 98 39 30 B 69 98 61 55 C 100 98 74 70 D 98 98 80 77 Assume: HSG'A' = 0.0% Assume good condition Offsite wooded HSG'B' = 35.8% Assume good condition Offsite pond Total area = Composite SCS CN = HSG'C' = 0.0% - HSG'D'= 64.2% Cover Condition SCS CN Comments Impervious 98 - en 73 Assume good condition Wooded 69 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.01 Onsite open 73 0.29 Assume good condition Onsite wooded 69 0.93 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 73 0.00 Assume good condition Offsite wooded 69 0.00 Assume good condition Offsite pond Total area = Composite SCS CN = 100 1.23 0.0019 70 0.00 acres sq.mi. - % Impervious = 0.8% J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin IF- Bypass B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) = 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin I G -To SWMF 8 8/21/2014 I. SCS CURVE NUMBERS -3m HSG Impervious 98 Open 39 Wooded 30 A B 98 61 55 C 98 74 70 D 98 80 77 Assume: HSG'A' = 0.0% HSG'B'= 93.9% HSG'C' = 0.0% HSG'D' = 6.0% Cover Condition SCS CN Comments Impervious 98 - Open 62 Assume good condition Wooded 56 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 3.03 62 Onsite-open 62 3.67 Assume good condition Onsite wooded 56 1.92 Assume good condition Onsite pond 100 0.28 Offsite impervious 98 1.07 - _ i Offsite open 62 0.02 Assume good condition Offsite wooded 56 0.00 Assume good condition Offsite pond 100 0.00 - Total area = 9.99 acres 0.0156 sq.mi. Composite SCS CN = 77 % Impervious = 41.0% HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 1 G -To SWMF 8 B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. of Concentration = 5.00 SCS Lag Time = 3.00 0.0500 Time Increment = 0.87 minutes minutes (SCS Rag = 0.6* Tc) hours minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin IG- Bypass 8/21/2014 I. SCS CURVE NUMBERS HSG Impervious Open Wooded A 98 39 30 B 98 61 55 C 98 74 70 — D - _- -_ - - -- 98 80 77 Assume: HSG'A'= 0.0% HSG'B' = 97.8% HSG'C' = 0.0% HSG'D' = 2.2% Cover Condition SCS CN Comments Impervious 98 Open 61 Assume good condition Wooded 55 Assume good condition I1. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Onsite impervious 98 0.00 Onsite open 61 0.34 Onsite wooded 55 1.02 Onsite pond 100 0.00 Offsite impervious 98 0.00 _ Offsite open 61 0.00 Offsite wooded 55 0.00 Offsite pond 100 0.00 Total area = 1.36 acres 0.0021 sq.mi. Composite SCS CN = 57 % Impervious = 0.0% Comments - Assume good condition Assume good condition ;-»Nuuic yuuu wuuiuUu Assume good condition HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin I G- Bypass B. Time of Concentration Information Time of concentration was conservatively assumed to be S minutes. Time of Concentration = 5.00 SCS Lag Time = 3.00 0.0500 Time Increment = 0.87 minutes minutes (SCS Lag = 0.6* Tc) hours minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin IH -TO SWMF 1 8/21/2014 I. SCS CURVE NUMBERS HSG G x Impervious Open Wooded A 61 98 39 30 B Assume good condition 98 61 55 C 98 74 70 D 98 80 77 Assume: HSG'A' = 0.0% HSG'B' = 100.0% HSG'C'= 0.0% HSG'D' = 0.0% Cover Condition SCS CN Comments Impervious 98 - _ Open 61 Assume good condition Wooded 55 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area Onsite impervious Onsite Onsite wooded Onsite pond Offsite impervious Offsite open Offsite wooded _ Offsite pond SCS CN Area jacresl Comments 98 61 6.04 1.85 - Assume good condition 55 100 98 0.00 0.40 1.45 Assume good condition_ 61 0.31 Assume good condition 55 0.00 Assume good condition 100 0.00 - Total area = 1 10.05 a HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin IH -TO SWMF 1 B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) = 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 1H- Bypass 8/21/2014 I. SCS CURVE NUMBERS HSG Impervious Open Wooded A 98 39 30 B 98 61 55 C 98 74 70 D 98 80 77 Assume: HSG'A'= 0.0% HSG'B'= 84.6% HSG'C' = 0.0% HSG'D'= 15.4% Cover Condition SCS CN Comments _ Impervious 98 - Open 64 Assume good condition Wooded 58 Assume good condition 11. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area O_nsite impervious Onsite oven Onsite wooded Onsite pond Offsite impervious Offsite open Offsite wooded Offsite pond SCS CN Area [acres] Comments 98 0.01 64 1.09 Assume good condition 58 5.84 Assume good condition 100 0.00 — 98 - 0.00 64 0.00 Assume good condition 58 0.00 Assume good condition 100 0.00 - Total area = Composite SCS CN = % Impervious = 6.94 acres 0.0108 sq.mi. 59 0.1% HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin IH- Bypass B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Length = 300 Length = 100 It Height = 6.42 ft Slope= 0.0587 ft/ft Manning's n = 0.34 Dense Grass/Wooded P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Segment Time = 11.75 minutes Segment 3: Channel Flow Length = 511 ft Height= 17.7 ft Slope = 0.0346 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 4.00 sf (Assume 2' x 2' Channel) Wetted Perimeter = 6.00 ft (Assume 2'x 2' Channel) Channel Velocity = 4.70 ft/sec Segment Time = 1.81 minutes Segment 2: Concentrated Flow Length = 300 It Height= 30.02 ft Slope = 0.1001 ft/ft Paved ? = No Velocity = 5.10 ft/sec Segment Time = 0.98 minutes Time of Concentration = 14.54 minutes SCS Lag Time = 8.73 minutes (SCS Lag = 0.6* Tc) Time Increment = 2.77 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 11 8/21/2014 1. SCS CURVE NUMBERS HSG — — C. _ D Impervious Open Wooded T 98 39 30 98 61 55 98 74 70 98 80 77 Assume: HSG'A' = 0.0% 98 HSG'B' = 89.0% 1.41 HSG'C' = 0.0% 100 HSG'D' = 11.0% 0.00 Cover Condition Comments SCS CN Impervious 98 - Open 63 Assume good condition Wooded 57 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area O_ nsite impervious Onsite onen Onsite wooded Onsite pond Offsite impervious Offsite open Offsite wooded Offsite pond SCS CN Area jacresi 98 0.00 63 1.41 57 2.14 100 0.00 98 0.00 Comments Assume good condition 63 0.00 Assume good condition 57 0.00 Assume good condition 100 0.00 Total area = 3.55 acres 0.0055 sq.mi. Composite SCS CN = 60 % Impervious = 0.0% HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 11 B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentrati on = 5.00 SCS Lag Time = 3.00 0.0500 Time Increment= 0.87 minutes minutes (SCS Lag = 0.6* Tc) hours minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 2A 8/21/2014 I. SCS CURVE NUMBERS HSG Comments - Impervious - Open Wooded A 0.00 - 98 39 30 B Assume good condition 98 61 55 C Onsite pond 98 74 70 D 98 98 80 77 61 Assume. HSG'A' = 0.0% 55 0.00 Assume good condition HSG'B' = 100.0% 0.00 - Total area = HSG'C'= 0.0% 0.0033 HSG'D'= 0.0% Composite SCS CN = 55 Cover Condition SCS CN Impervious 98 Comments - Open 61 Assume ood condition_ Wooded 55 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsiteimpervious 98 0.00 - Onsite open 61 0.12 Assume good condition Onsite wooded 55 1.98 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 - Offsite open 61 0.00 Assume good condition Offsite wooded 55 0.00 Assume good condition Offsite pond 100 0.00 - Total area = 2.10 acres 0.0033 sq.mi. Composite SCS CN = 55 % Impervious = 0.0% HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 2A B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Length = Height = Slope = Manning's n = P (2- year /24 -hour) = Segment Time = 100 It 13.2 ft 0.1320 ft/ft 0.40 Woods - Light Underbrush 3.48 inches (Wake County, NC) 9.68 minutes Time of Concentration = 9.91 7.56 SCS Lag Time = 5.95 Time Increment = 1.72 Segment 2: Concentrated Flow Length = 105.7 ft Height = 23.2 It Slope = 0.2195 ft/ft Paved ? = No Velocity= 7.56 fVsec Segment Time = 0.23 minutes nunutes minutes (SCS Lag = 0.6* Tc) minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 2B 8/21/2014 I. SCS CURVE NUMBERS HSG Impervious Open Wooded A 98 39 30 B 98 61 55 C 98 74 70 D 98 80 77 Assume. HSG'A' = 0.0% HSG'B' = 77.3% HSG'C' = 0.0% HSG'D'= 22.7% Cover Condition SCS CN Comments Impervious 98 Open 65 Assume good condition Wooded 60 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.00 Onsite open 65 0.51 Assume good condition Onsite wooded 60 3.54 Assume good condition Onsite pond 100 0.00 - Offsite impervious 98 0.00 Offsite open 65 0.00 Assume good condition Offsite wooded 60 0.00 Assume good condition Offsite pond 100 0.00 Total area = 4.05 acres 0.0063 sq.mi. Composite SCS CN = 61 % Impervious = 0.0% HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 2B B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 350 It Height = 4.2 ft Height = 43.1 ft Slope = 0.0420 ft/ft Slope = 0.1231 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 5.66 ft/sec Segment Time = 15.30 minutes Segment Time = 1.03 minutes Time of Concentration = 16.33 minutes SCS Lag Time = 9.80 minutes (SCS Lag = 0.6* Tc) Time Increment = 2.84 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 2C -To SWMF 3 I. SCS CURVE NUMBERS HSG Impervious Open Wooded '4 Ac. Resid Lots A 98 39 3-0 61 B 98 61 55 75 C 98 74 70 83 -- D -_ 98 80 77 87 Assume: HSG'A'= 0.0% HSG'B'= 100.0% HSG'C'= 0.0% HSG'D'= 0.0% Cover Condition Comments SCS CN Impervious 98 - Open _ 61 Assume good condition Wooded 55 Assume good condition 1/4 Ac. Resid. Lots 75 Assume 38% Impervious H. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 13.21 - Onsite open 61 3.29 Assume good condition Onsite wooded 55 0.00 Assume good condition Onsite pond 100 0.77 - Offsite impervious 98 1.46 Offsite open 61 1.51 Assume good condition Offsitc wooded 55 0.03 Assume good condition Offsite 1/4 Ac Resid. Lots 75 0.20 Assume 38% Impervious Offsite pond 100 0.00 - Total area = Composite SCS CN = % Impervious = 20.47 acres 0.0320 sq.mi. 89 72.0% J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 2C -To SWMF 3 B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) = 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 2C -To SWMF 4 8/21/2014 I. SCS CURVE NUMBERS 3.02 HSG Impervious Open Wooded A 98 39 30 B 98 61 55 C 98 74 70 D -- 98 80 77 Assume. HSG'A' = 0.0% 62 HSG'B' = 97.3% Assume good condition HSG'C' = 0.0% 0.00 HSG'D' = 2.7% - Cover Condition SCS CN Comments Impervious 98 Open 62 Assume good condition Wooded 56 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area Onsite impervious Onsite open Onsite wooded Onsite pond Offsite impervious Offsite open Offsite wooded Offsite pond SCS CN Area [acres] Comments I 98 4.60 62 3.02 Assume good condition_ 56 0.19 Assume good condition 100 0.47 - 98 0.00 - 62 0.00 Assume good condition 56 0.00 Assume good condition - 100 0.00 Total area = 8.28 acres 0.0129 sq.mi. Composite SCS CN = 84 % Impervious = 55.6% HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 2C -To SWMF 4 B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 5ubbasin 2C- Bypass - Onsite 1. SCS CURVE Ntfmff3L12S'` HSG A B C D Assume: HSG'A' = HSG'B' = HSG'C' = HSG'D' = Cover Condition Impervious Open Wooded IL POST - DEVELOPMENT A. Watershed Breakdown Contributing Area Onsite impervious Onsite open Onsite wooded Onsite pond Offsite impervious Offsite open Offsite wooded Offsite pond Total area = Composite SCS CN = % Impervious = Impervious 98 98 98 98 0.0% 64.6% 0.0% 35.4% SCS CN 98 68 63 SCS CN 98 61 55 100 98 61 55 100 3.42 0.0053 58 2.6% Open Wooded 1/4 Ac. Resid Lots 39 30 61 61 55 75 74 70 83 80 77 87 Comments Assume good condition Assume good condition Area [acres] 0.09 1 1.17 2.16 0.00 0.00 0.00 0.00 0.00 acres sq.mi. Comments Assume good condition Assume good condition Assume good condition Assume good condition J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 2C- Bypass - Onsite 8/21/2014 B. Time of Concentration Information ** *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 It Length = 24 ft Height = 16.7 ft Height = 4.4 ft Slope = 0.1670 ft/ft Slope = 0.1833 ft/ft Manning's n = 0.38 Woods /Dense Grasses Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 6.91 ft/sec Segment Time = 8.46 minutes Segment Time = 0.06 minutes Segment 3: Channel Flow Length = 545 ft Height = 13.9 ft Slope = 0.0255 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume 4'x3' Channel) Wetted Perimeter = 10.00 ft (Assume 4'x 3' Channel) Channel Velocity = 5.97 ft/sec Segment Time = 1.52 minutes Time of Concentration = 10.04 minutes SCS Lag Time = 6.02 minutes (SCS Lag = 0.6* Tc) Time Increment = 1.75 minutes (= 0.29 *SCS Lag) HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 2C- Bypass - Offsite 8/21/2014 I. SCS CURVE NUMBERS HSG Impervious Open Wooded 1/4 Ac. Resid Lots A 98 _.. - :..:..:. 39._.. 30 61 B 98 61 55 75 C 98 74 70 83 D 98 80 77 87 Assume: HSG'A'= 0.0% 1.38 HSG B' = 100.0% _ 2.23 Assume good condition HSG'C'= 0.0% 0.31 Assume good condition HSG T)'= 0.0% 0.58 Assume 38% Impervious Cover Condition SCS CN Comments - Impervious 98 - Open 61 Assume good condition Wooded 55 Assume good condition 1/4 Ac. Resid. Lots 75 Assume 38% Impervious IL POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 1 98 0.00 Onsite open _ 61 0.00 Assume good condition Onsite wooded 55 _ 0.00 Assume good condition Onsite pond 100 _ _ 0.00 Offsite impervious 98 1.38 Offsite open 61 _ _ 2.23 Assume good condition Offsite wooded 55 0.31 Assume good condition Offsite 1/4 Ac Resid. Lots 75 0.58 Assume 38% Impervious Offsite pond 100 0.00 - Total area = Composite SCS CN = % Impervious = 4.50 acres 0.0070 sq.mi. 74 35.6% HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 2C- Bypass - Offsite B. Time of Concentration Information ** *Time ofconcentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow 77 ft Length = 100 ft Height = 3.1 ft Slope = 0.0310 ft/ft Manning's n = 0.26 Woods/Dense Grasses P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Segment Time = 12.24 minutes Segment 3: Channel Flow ft Height = Length = 504 ft Height = 19.4 ft Slope = 0.0385 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume Tx 1' Channel) Wetted Perimeter = 4.00 ft (Assume 2'x P Channel) Channel Velocity = 4.09 ft/sec Segment Time = 2.05 minutes Segment 2: Concentrated Flow J. ALLEN, PE 8/21/2014 Length = 77 ft Height = 18.2 R Slope = 0.2364 ft/ft Paved ? = No Height = Velocity = 7.84 ft/sec Segment Time = 0.16 minutes Segment 4: Channel Flow ft/ft Length = 70 ft Height = 0.4 ft Slope = 0.0057 ft/ft Manning's n = 0.013 Assume 18" RCP Culvert Flow Area = 1.77 sf (Assume 18" RCP) Wetted Perimeter = 4.71 ft (Assume 18" RCP) Channel Velocity = 4.51 ft/sec Segment Time = 0.26 minutes Segment 5: Channel Flow 55 ft Segment 6. Channel Flow 0.6 Length = 71 ft Length = 53 R Height = 5.1 ft Height = 0.1 ft Slope = 0.0718 ft/ft Slope = 0.0019 ft/ft Manning's n = 0.013 Assume 18" RCP Culvert Manning's n = 0.013 Assume 18" RCP Culvert Flow Area = 1.77 sf (Assume 18" RCP) Flow Area = 1.77 sf (Assume 18" RCP) Wetted Perimeter = 4.71 ft (Assume 18" RCP) Wetted Perimeter = 4.71 ft (Assume 18" RCP) Channel Velocity = 15.98 ft/sec Channel Velocity = 2.59 ft/sec Segment Time = 0.07 minutes Segment Time = 0.34 minutes Segment 7. Channel Flow Length = 55 ft Height = 0.6 ft Slope = 0.0109 ft/ft Manning's n = 0.013 Assume 18" RCP Culvert Flow Area = 1.77 sf (Assume 18" RCP) Wetted Perimeter = 4.71 ft (Assume 18" RCP) Channel Velocity = 6.23 ft/sec Segment Time = 0.15 minutes Time of Concentration = 15.28 minutes SCS Lag Time = 9.17 minutes (SCS Lag = 0.6* Tc) Time Increment = 2.66 minutes (= 0.29 *SCS Lag) HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 3A 8/21/2014 I. SCS CURVE NUMBERS HSG Impervious Open Wooded A 98 _. 39 30 B - - - 98 - - - -- 61 55 C 98 74 70 D 98 80 77 Assume: HSG'A' = 0.0% HSG'B' = 100.0% HSG'C'= 0.0% HSG'D' = 0.0% Cover Condition SCS CN Comments Im ervious 98 - Open 61 Assume good condition Wooded 55 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area Onsite impervious SCS CN 98 Area [acres] 0.00 Comments Onsite open 61 0.82 Assume good condition Onsite wooded 55 0.53 Assume good condition Onsite pond 100 0.00 Offsite impervious 98 0.00 - Offsite open 61 0.00 Assume good condition Offsite wooded 55 0.00 Assume good condition _ Offsite pond 100 0.00 - Total area = 1.35 acres 0.0021 sq.mi. Composite SCS CN = 59 % Impervious = 0.0% HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 3A B. Time of Concentration Information Time of concentration was conservatively assumed to be S minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) = 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 3B I. SCS CURVE NUMBERS HSG 0.00 0.13 0.05 Impervious Open Wooded A 98 98 39 30 B Assume good condition 98 61 55 C 0.00 98 74 70 D 98 80 77 Assume. HSG'A' = 0.0% HSG'B'= 100.0% HSG'C'= 0.0% HSG'D' = 0.0% Cover Condition SCS CN Comments Impervious _ _ _ 98 Open �61 Wooded 55 II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area Onsite impervious Onsite open Onsite wooded Onsite pond Offsite impervious Offsite open Offsite wooded Offsite pond Total area = Composite SCS CN = % Impervious = Assume good condition Assume good condition SCS CN Area jacresl Comments 98 61 55 0.00 0.13 0.05 Assume good condition Assume good condition 100 0.00 - 98 0.00 - 61 0.00 Assume good condition 55 0.00 Assume good condition 100 0.00 - 0.18 acres 0.0003 sq.mi 59 0.0% J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 3B B. Time of Concentration Information Time of concentration was conservatively assumed to be S minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 8/21/2014 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 3C -To SWMF 5 11/21/2014 I. SCS CURVE NUMBERS Assume: HSG Impervious Open Wooded 1/4 Ac. Resid Lots A 98 39 30 61 B 98 61 55 75 C 98 74 70 83 D 98 80 77 87 HSG'A'= 0.0% HSG'B' = 100.0% HSG'C'= 0.0% HSG'D'= 0.0% Cover Condition SCS CN Comments Impervious 98 98 Open 61 Assume good condition Wooded 55 Assume good condition 1/4 Ac. Resid: Lots 75 Assume 38% Impervious IL POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 9.27 - Onsite open 61 5.29 Assume good condition Onsite wooded 55 3.64 Assume good condition Onsite pond 100 0.51 - Offsite impervious 98 0.00 - Offsite open 61 Offsite wooded 55 0.00 Assume good condition 0.00 Assume good condition Offsite 1/4 Ac Resid. Lots 75 2.28 Assume 38% Im ervious Offsite pond 100 0.00 - Total area = 20.99 acres 0.0328 sq.mi. Composite SCS CN = 79 % Impervious= 48.3% HOLLY SPRINGS TOWN CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 3C -To SWMF 5 11/21/2014 B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) = 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 3C- Bypass 11/21/2014 I. SCS CURVE NUMBERS Assume: HSG Impervious Open wooded A 98 39 30 B 98 61 55 C 98 74 70 D 98 80 77 Cover Co Imp_ ery Ope Woo 11. POST- DEI'ELOPMENT A. Watershed Breakdown HSG'A'= 0.0% HSG'B' = 100.0% HSG'C'= 0.0% HSG'D' = 0.0% ndition S SCS CN C Comments ious 9 98 - - n 6 61 A Assume good condition Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.00 - Onsite open 61 0.92 Assume good condition Onsite wooded 55 0.66 Assume good condition Onsite pond 100 0.00 Offsite impervious 98 0.00 Offsite open 61 0.00 Assume good condition Offsite wooded 55 0.00 Assume good condition Offsite pond 100 0.00 - Total area = Composite SCS CN = % Impervious = 1.58 acres 0.0025 sq.mi. 58 0.0% Total area = Composite SCS CN = % Impervious = 1.58 acres 0.0025 sq.mi. 58 0.0% HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 3C- Bypass 11/21/2014 B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) = 0.0500 hours - Time Increment = 0.87 minutes (= 0.29 *SCS Lag) HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 3D -To SWMF 6 I. SCS CURVE NUMBERS 98 Onsite open q 61 HSG 55 Impervious Open Wooded A 98 98 39 30 B 55 98 61 _ 55 C 98 74 70 D 98 80 77 Assume: HSG'A'= 0.0% HSG'B'= 100.0% HSG'C'= 0.0% HSG'D' = 0.0% Cover Condition SCS CN Comments Impervious _ 98 _ Open 61 Assume good condition Wooded 55 Assume good condition II. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Onsite impervious 98 Onsite open q 61 Onsite wooded 55 Onsite pond __100 Offsite impervious 98 _ Offsite open 61 Offsite wooded 55 Offsite pond 100 Total area = 17.65 0.0276 Composite SCS CN = 83 % Impervious = 57.8% Area [acres] 8.68 _ 5.04 Assume good condition 0.69 Assume good condition _ 0.60 - 1.53 - ' ' ' Assume good condition _ Assume good condition Comments 0.00 acres sq.mi. J. ALLEN, PE 1/28/2015 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 3D -To SWMF 6 B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 1/28/2015 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 3D- Bypass L SCS CURVE NUMBERS A�" HSG A Impervious Open Wooded 30 98 39 B 98 61 55 C 98 74 70 D 98 80 77 Assume: HSG'A'= 0.0% HSG'B' = 100.0% HSG'C'= 0.0% HSG'D'= 0.0% Cover Condition SCS CN Comments Impervious 98 - Open 61 Assume good condition Wooded 55 Assume good condition H. POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.00 Onsite open 61 0.76 Assume good condition Onsite wooded 55 0.56 Assume good condition Onsite pond 100 0.00 Offsite impervious 98 0.00 Offsite open 61 0.00 Assume good condition Offsite wooded 55 0.00 Assume good condition Offsite pond 100 0.00 Total area = 1.32 acres 0.0021 sq.mi. Composite SCS CN = 58 % Impervious = 0.0% J. ALLEN, PE 11/21/2014 HOLLY SPRINGS ToWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 3D- Bypass B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) = 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 11/21/2014 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 3E- Bypass - Onsite 11/21/2014 I. SCS CURVE NUMBERS Assume: HSG Impervious Open Wooded 1/4 Ac. Resid Lots A 98 39 30 61 B 98 61 55 75 C 98 74 70 83 D 98 80 77 87 HSG'A'= 0.0% HSG'B'= 100.0% HSG'C'= 0.0% HSG 'D' = 0.0% Cover Condition SCS CN Comments Impervious 98 Open 61 Assume good condition Wooded 55 Assume good condition IL POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Comments Onsite impervious 98 0.00 - Onsite open 61 1.41 Assume good condition Onsite wooded 55 0.81 Assume good condition Onsite pond 100 Offsite impervious 98 Offsite open 61 0.00 Assume good condition Assume good condition 0.00 0.00 0.00 Offsite wooded 55 100 _ Offsite pond 0.00 - Total area = 2.22 acres 0.0035 sq.mi. Composite SCS CN = 59 % Impervious = 0.0% HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 3E- Bypass- Onsite B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration= 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) = 0.0500 hours Time Increment= 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 11/21/2014 HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN. PE KRG -11010 Comments Subbasin 3E- Bypass- Offsite 8/21/2014 I. SCS CURVE NUMBERS 0.00 - HSG - , impervious - O en p Wooded 1/4 Ac. Resid Lots A 98 39 30 61 B 98 61 55 75 C 98 74 70 83 D 98 80 77 87 Assume: HSG'A' = 0.0% 61 HSG 'B'= 100.0% Offsite wooded HSG'C'= 0.0% Assume good condition HSG D' = 0.0% 2.78 Cover Condition SCS CN Comments Impervious _� 98 Total area = Open 61 Assume good condition Wooded 55 Assume good condition 1/4 Ac. Resid. Lots 75 Assume 38% Impervious IL POST- DEVELORI7ENT A. Watershed Breakdown Contributing Area SCS CN Area [acres[ Comments Onsite impervious 98 0.00 - Onsite open 61 0.00 Assume good condition Onsite wooded 55 0.00 Assume good condition Onsite pond 100 0.00 Offsite impervious 98 1.38 Offsite open 61 3.84 Assume good condition Offsite wooded 55 1.07 Assume good condition _ Offsite 1/4 Ac Resid. Lots 75 2.78 Assume 38% Impervious Offsite pond 100 0.00 - Total area = 9.07 acres 0.0142 sq.mi. Composite SCS CN = 70 % Impervious = 26.9% HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY 1. ALLEN, PE KRG -11010 Subbasin 3E- Bypass- Offsite 8/21/2014 B. Time of Concentration Information ** *Time ofconcentration is calculated using the SCS Segmental Approach (TR -55). Segment 1: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 229 ft Height = 6.3 ft Height = 26.3 ft Slope = 0.0630 ft/ft Slope = 0.1148 ft/ft Manning's n = 0.40 Woods - Light Underbrush Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 5.47 ft/sec Segment Time = 13.01 minutes Segment Time = 0.70 minutes Segment 3: Channel Flow Segment 4: Channel Flow Length = 253 ft Length = 367 ft Height = 14.7 ft Height = 2.2 It Slope = 0.0581 ft/ft Slope = 0.0060 ft/ft Manning's n = 0.045 Natural Channel Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume 2'x 1' Channel) Flow Area = 5.00 sf (Assume 5'x 1' Channel) Wetted Perimeter = 4.00 ft (Assume 2'x 1' Channel) Wetted Perimeter = 7.00 ft (Assume 5'x 1' Channel) Channel Velocity = 5.03 ft /sec Channel Velocity = 2.05 ft/sec Segment Time = 0.84 minutes Segment Time = 2.99 minutes Segment 5: Channel Flow Length = 169 ft Height = 16.3 ft Slope = 0.0964 ft/ft Manning's n = 0.013 Assume 18" RCP Culvert Flow Area = 1.77 sf (Assume 18" RCP) Wetted Perimeter = 4.71 ft (Assume 18" RCP) Channel Velocity = 18.52 ft /sec Segment Time = 0.15 minutes Time of Concentration = 17.69 minutes SCS Lag Time = 10.61 minutes (SCS Lag = 0.6* Tc) Time Increment = 3.08 minutes (= 0.29 *SCS Lag) HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 5- Onsite 11/25/2014 L SCS CURVE NUMBERS Assume: HSG Impervious Open Wooded 1/4 Ac. Resid Lots A 98 39 30 61 B C 98 61 74 55 70 75 83 _ 98 D 98 80 77 87 HSG'A' = 0.0% HSG'B'= 100.0% HSG'C'= 0.0% HSG'D'= 0.0% Cover Condition SCS CN Comments Impervious 98 - Open 61 Assume good condition_ Wooded 55 Assume good condition 1/4 Ac. Resid. Lots 75 Assume 38 % Impervious IL POST - DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] 0.00 1.53 Comments Assume good condition Onsite impervious 98 Onsite open 61 Onsite wooded Onsite pond Offsite impervious _ 55 100 98 0.39 0.00 _ 0.00 Assume good condition - Offsite open 61 Assume good condition Offsite wooded e 55 0.00 Assume good condition Offsite 1/4 Ac Resid. Lots 75 0.00 Assume 38 % Impervious Offsitc pond 100 0.00 - Total area = Composite SCS CN = % Impervious = 1.92 acres 0.0030 sq.mi. 60 19.9% HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY KRG -11010 Subbasin 5- Onsite B. Time of Concentration Information Time of concentration was conservatively assumed to be 5 minutes. Time of Concentration = 5.00 minutes SCS Lag Time = 3.00 minutes (SCS Lag = 0.6* Tc) = 0.0500 hours Time Increment = 0.87 minutes (= 0.29 *SCS Lag) J. ALLEN, PE 11/25/2014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 5- Offsite 11/21/2014 I. SCS CURVE NUMBERS Assume: A 98 B 98 C 98 D 98 HSG'A'= 0.0% HSG'B'= 100.0% HSG'C'= 0.0% HSG'D'= 0.0% 'pen Wooded 1/4 Ac. Resid Lots 39 30 61 61 55 75 74 70 83 80 77 87 Cover Condition SCS CN Comments Impervious 98 0.00 Open 61 Assume good condition Wooded 55 Assume good condition 1/4 Ac. Resid. Lots 75 Assume 38% Impervious 11 POST- DEVELOPMENT A. Watershed Breakdown Contributing Area SCS CN Area [acres] Onsite impervious 98 0.00 Onsite open 61 0.00 Onsite wooded 55 0.00 Onsite pond 100 0.00 Offsite impervious 98 1.65 Offsite open 61 4.58 Offsite wooded 55 1.25_ Fsite 1/4 Ac Resid. Lots 75 3.57_ Offsite pond Total area = Composite SCS CN = % Impervious = 100 11.05 0.0173 70 27.2% 0.00 acres sq.mi. Comments Assume good condition Assume good condition Assume good condition Assume good condition Assume 38% Impervious HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Subbasin 5- Offsite 11/21/2014 B. Time of Concentration Information * * *Time of concentration is calculated using the SCS Segmental Approach (TR -55). Segment I: Overland Flow Segment 2: Concentrated Flow Length = 100 ft Length = 182 ft Height = 4.9 ft Height = 25.9 ft Slope = 0.0490 ft/ft Slope = 0.1423 ft/ft Manning's n = 0.24 Dense Grasses Paved ? = No P (2- year /24 -hour) = 3.48 inches (Wake County, NC) Velocity = 6.09 ft/sec Segment Time = 9.56 minutes Segment Time = 0.50 minutes Segment 3: Channel Flow Segment 4: Channel Flow Length = 117 ft Length = 166 ft Height = 9.3 ft Height = 6.9 ft Slope = 0.0795 ft/ft Slope = 0.0416 ft/ft Manning's n = 0.045 Natural Channel Manning's n = 0.013 Assume 18" RCP Culvert Flow Area = 2.00 sf (Assume 2'x 1' Channel) Flow Area = 1.77 sf (Assume 18" RCP) Wetted Perimeter = 4.00 ft (Assume 2'x 1' Channel) Wetted Perimeter = 4.71 ft (Assume 18" RCP) Channel Velocity = 5.88 ft/sec Channel Velocity = 12.16 ft/sec Segment Time = 0.33 minutes Segment Time = 0.23 minutes Time of Concentration = 10.62 minutes SCS Lag Time = 6.37 minutes (SCS Lag = 0.6* Tc) Time Increment = 1.85 minutes (= 0.29 *SCS Lag) HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE Y-RG -11010 Reach Data 8/21/2014 111. CHANNEL REACH DATA => Reach 0- Subbasin #IB Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter= Channel Velocity = Segment Time = I Reach #1 Total Time = I => Reach #24unction #3 -P0A #1 Channel Flow Length = Height = Slope= Manning's n= Flow Area = Wetted Perimeter= Channel Velocity = Segment Time = Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter= Channel Velocity = Segment Time = Reach #2 Total Time = => Reach #9- Junc6ni #6 - Junction #3 Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Reach #3 Total Time = I- Reach #4- Subbasin WE Channel Flow Length = Height = Slope= Manning's n= Flow Area= Wetted Perimeter = Channel Velocity = Segment Time = I Reach #4 Total Time = 704 5.7 0.0081 0.045 20.00 13.00 3.97 2.96 2.96 212 4 0.0189 0.013 28.27 18.85 20.63 0.17 771 8.6 0.0112 0.045 20.00 13.00 4.66 2.76 2.93 123 1.9 0.0154 0.045 20.00 13.00 5.48 0.37 0.37 302 6.9 0.0228 0.045 12.00 10.00 5.65 0.89 0.89 ft ft ft/ft Natural Channel sf (Assume 5' x 4' Channel) ft (Assume 5' x 4' Channel) ft/sec minutes minutes 1 I R ft ft/ft Assume 72" RCP Culvert sf (Assume 72" RCP) R (Assume 72" RCP) ft/sec minutes ft ft ft/ft Natural Channel sf (Assume 5' x 4' Channel) R (Assume Y x 4' Channel) ft/sec minutes minutes I ft ft Wit Natural Channel sf (Assume Tx 4' Channel) ft (Assume 5'x 4' Channel) ft/see minutes minutes ft ft ft/ft Natural Channel sf (Assume 4'x 3' Channel) ft (Assume 4'x 3' Channel) ft/sce minutes minutes HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Reach Data 8/21/2014 �_> Reach #5- Subbasin #1F -To SWMF2 Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter= Channel Velocity = Segment Time = Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter= Channel Velocity = Segment Time = Reach #5 Total Time = -Reach #6- Subbasin #IG -To SWMF8 Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Reach #6 Total Time = _> Reach #7- Junction #9 - Junction #6 Channel Flow Length = Height = Slope= Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Reach #7 Total Time = Reach #8- Subbasin #IR - -To SWMF1 Channel Flow Length = Height = Slope = Mammng's n = Flow Area = Wetted Perimeter= Channel Velocity = Segment Time = Channel Flow Length Height Slope Manning's n Flow Area Wetted Perimeter Channel Velocity 123 1.3 0.0106 0.045 2.00 4.00 2.14 0.96 282 6.8 0.0241 0.045 12.00 10.00 5.81 0.81 1.77 108 4.2 0.0389 0.045 2.00 4.00 4.11 0.44 0.44 691 15.74 0.0228 0.045 12.00 10.00 5.64 2.04 2.04 105 9.3 0.0886 0.045 2.00 4.00 6.21 a28 74 3.06 0.0414 0.045 4.00 6.00 5.14 ft ft Wit Natural Channel sf (Assume 2'x l' Channel) ft (Assume 2'x l' Channel) ft/sec minutes ft ft tuft Natural Channel sf (Assume 4'x 3' Channel) R (Assume 4'x 3' Channel) Wsec minutes minutes I ft ft fdft Natural Channel sf (Assume 2'x P Channel) R (Assume 2'x l' Channel) ft/sec minutes minutes I ft ft tuft Natural Channel sf (Assume 4'x 3' Channel) ft (Assume 4'x 3' Channel) ft/sec minutes minutes I ft It tuft Natural Channel sf (Assume 2' x 1' Channel) ft (Assume 2'x 1' Channel) ft/sec minutes ft ft ft/ft Natural Channel sf (Assume 2'x 2' Channel) R (Assume 2'x 2' Channel) ft/sec Segment Time= 0.24 minutes Reach #8 Total Time = 0.51 minutes HOLLY SPRINGS TOWNE CENTER POST- DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Reach Data 8/2112014 �_> Reach #9- Subbasin #2A Channel Flow Length = Height = Slope = Manning's n = Flow Area= Wetted Perimeter= Channel Velocity = Segment Time = Reach #9 Total Time = Reach #10- Subbasin #2B Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter= Channel Velocity = Segment Time = Reach #10 Total Time = I_> Reach #11- Junction #4 - POA #2 Channel Flow Length = Height= Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Channel Flow Length = Height = Slope = Manning's n = Flow Area = Wetted Perimeter= Channel Velocity = Segment Time = Reach #11 Total Time = Reach #12- Subbasin #2C -To SWMF4 Channel Flow Length = Height= Slope = Manning's n = Flow Area = Wetted Perimeter = Channel Velocity = Segment Time = Charwel Flow Length = Height= Slope = Manning's n = Flow Area = Wetted Perimeter= Channel Velocity = 411 6.2 0.0151 0.045 16.00 12.00 4.93 1.39 1.39 502.66 5.3 0.0105 0.045 16.00 12.00 4.12 2.03 2.03 292 9 0.0308 0.013 15.90 14.14 21.76 0.22 623 8.7 0.0140 0.045 16.00 12.00 4.74 2.19 2.41 40 4 0.1000 0.045 2.00 4.00 6.60 0.10 119 1 0.0084 0.045 12.00 10.00 3.43 ft ft ft/ft Natural Channel sf (Assume 4'x 4' Channel) R (Assume 4'x 4' Channel) ft/sec minutes minutes ft ft Rift Natural Channel sf (Assume 4'x 4' Channel) ft (Assume 4'x 4' Channel) ft/sec minutes minutes 1 ft ft Rift Assume 54" RCP Culvert sf (Assume 54" RCP) ft (Assume 54" RCP) ft/sec minutes ft ft ft/ft Natural Channel s£(Assume 4'x 4' Channel) ft (Assume 4'x 4' Channel) ft/sec minutes minutes ft ft tuft Natural Channel sf (Assume 2'x 1' Channel) ft (Assume 2'x 1' Channel) ft/sec minutes ft ft ft/ft Natural Channel sf (Assume 4' x3' Channel) ft (Assume 4'x 3' Channel) fdsec Segment Time= 0.58 minutes Reach #12 Total Time = 0.68 minutes HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY KRG -11010 Reach Data I_> Reach #13- Subbasin #2C -To S{VMF3 Channel Flow Length = 34 It Height= 5.1 ft Slope= 0.1500 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume Tx 1' Channel) Wetted Perimeter= 4.00 ft (Assume 2'x l' Channel) Channel Velocity = 8.08 ft/sec Segment Time= 0.07 minutes Channel Flow Length= 92 ft Height= 0.9 ft Slope= 0.0098 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume 4'x3' Channel) Wetted Perimeter = 10.00 It (Assume 4'x 3' Channel) Channel Velocity = 3.70 ft/sec Segment Time= 0.41 minutes Reach #13 Total Time = 0.48 minutes _> Reach #14- Subbasin #3A Channel Flow Length = 50 ft Height = 3.3 ft Slope= 0.0660 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 20.00 sf (Assume 5' x 4' Channel) Wetted Perimeter= 13.00 R (Assume 5' x 4' Channel) Channel Velocity = 11.34 ft/sec Segment Time= 0.07 minutes Reach #14 Total Time = 0.07 minutes => Reach #15- Subbasin #3C - To SWMF #5 to Junction #13 Channel Flow Length = 114 R Height= 6 ft Slope= 0.0526 fl/ft Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume 2'x 1' Channel) Wetted Perimeter= 4.00 R (Assume 2'x V Channel) Channel Velocity = 4.79 ft/sec Segment Time= 0.40 minutes Channel Flow Length = 363 ft Height = 4.1 ft Slope= 0.0113 Wit Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume 4'x 3' Channel) Wetted Perimeter= 10.00 It (Assume 4'x 3' Channel) Channel Velocity = 3.97 RAM Segment Time = L52 minutes Reach #15 Total Time = 1.92 minutes J. ALLEN, PE 8/2112014 HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 Reach Data 8/21/2014 I _> Reach #16- Subbasin #3D -To SHXF6 To Junction #13 Channel Flow Length = 15 ft Height= 4 ft Slope= 0.2667 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 2.00 sf (Assume 2'x l' Channel) Wetted Perimeter= 4.00 It (Assume 2'x I' Channel) Channel Velocity = 10.77 Riser Segment Time= 0.02 minutes Channel Flow Length = 67 ft Height= 0.1 ft Slope = 0.0015 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume 4'x 3' Channel) Wetted Perimeter = 10.00 It (Assume 4'x 3' Channel) Channel Velocity = 1.44 ft/sec Segment Time= 0.77 minutes Reach #16 Total Time = 0.80 minutes -�Reach #17- Jumcdon #13 To POA #3 Channel Flow Length = 178 ft Height = 2.9 It Slope= 0.0163 ft/ft Manning's n = 0.013 Assume 54" RCP Culvert Flow Area = 15.90 sf (Assume 54" RCP) Wetted Perimeter= 14.14 ft (Assume 54" RCP) Channel Velocity = 15.82 ft/sec Segment Time = 0.19 minutes Channel Flow Length = 50 ft Height= 3.3 ft Slope= 0.0660 ft/ft Manning's n= 0.045 Natural Channel Flow Area = 20.00 sf (Assume 5' x 4' Channel) Wetted Perimeter= 13.00 ft (Assume 5'x 4' Channel) Channel Velocity = 11.34 ft/sec Segment Time= 0.07 minutes Reach #17 Total Time = 0.26 minutes = >Reach #18- Junction #5 To Junction #13 Channel Flow Length = ' 71 It Height = 2 ft Slope = 0.0282 Rift Manning's n = 0.013 Assume 48" RCP Culvert Flow Area = 3.14 sf (Assume 48" RCP) Wetted Perimeter= 6.28 R (Assume 48" RCP) Channel Velocity = 12.12 ft/sec Segment Time= 0.10 minutes Channel Flow Length = 820 ft Height= 16.1 It Slope = 0.0196 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume 4'x 3' Channel) Wetted Perimeter= 10.00 ft (Assume Tx 3' Channel) Channel Velocity = 5.24 ft/sec Segment Time= 2.61 minutes Reach #18 Total Time = 2.71 minutes _> Reach #20- Subbasin #5 To POA #5 Channel Flow Length = 168 It Height = 6 ft Slope= 0.0357 ft/ft Manning's n = 0.013 Assume 54" RCP Culvert Flow Area = 15.90 sf (Assume 54" RCP) Wetted Perimeter= 14.14 ft (Assume 54" RCP) Channel Velocity = 23.42 ft/sec Segment Titre = 0.12 minutes Reach #20 Total Time = 0.12 minutes HOLLY SPRINGS TOWNE CENTER POST - DEVELOPMENT INPUT SUMMARY J. ALLEN, PE KRG -11010 React Data 8/21/2014 _> Reach #21- Subbasin #2C- Bypass Offsite Channel Flow Length = 20 ft Height= 0.2 ft Slope= 0.0100 fVft Manning's n= 0.013 Assume 18" RCP Culvert Flow Area = 1.77 sf (Assume 18" RCP) Wetted Perimeter= 4.71 ft (Assume 18" RCP) Channel Velocity= 5.96 ft/sec Segment Time= 0.06 minutes Channel Flow Length= 623 It Height= 15.2 ft Slope= 0.0244 ft/ft Manning's a = 0.013 Assume 30" RCP Culvert Flow Area = 4.91 sf (Assume 30" RCP) Wetted Perimeter= 7.85 ft (Assume 30" RCP) Channel Velocity = 13.09 ft/sec Segment Time= 0.79 minutes Channel Flow Length= 658 ft Height= 19.4 ft Slope= 0.0295 Wilt Manning's n = 0.045 Natural Channel Flow Area = 12.00 sf (Assume 4'x3' Channel) Wetted Perimeter = 10.00 ft (Assume 4'x Y Channel) Channel Velocity = 6.42 ft/sec Segment Time= 1.71 minutes Reach #21 Total Time = 2.56 minutes Reach #22- Subbasin #3E- Bypass Offsite Channel Flow Length = 567 It Height= 18.8 It Slope= 0.0332 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 6.00 sf (Assume 3' x 2' Channel) Wetted Perimeter= 7.00 It (Assume 3' z 2' Channel) Channel Velocity = 5.44 ft/sec Segment Time= L74 minutes Reach #22 Total Time = L74 minutes _> Reach #13- Subbasin #5- Offsite Channel Flow Length = 437 ft Height= 25.6 ft Slope= 0.0586 ft/ft Manning's n = 0.013 Assume 24" RCP Culvert Flow Area = 3.14 sf (Assume 24" RCP) Wetted Perimeter = 6.28 ft (Assume 24" RCP) Channel Velocity = 17.48 ft/sec Segment Time= 0.42 minces Channel Flow Length = 248 ft Height= 3.8 ft Slope = 0.0153 ft/ft Manning's n = 0.045 Natural Channel Flow Area = 6.00 sf (Assume 3' x 2' Channel) Wetted Perimeter= 7.00 It (Assume 3' x 2' Channel) Channel Velocity = 3.70 Mee Segment Time= 1.12 minutes Reach #23 Total Time = 1.53 minutes .J McADAMS Scenario: Post - development POA #1 REACH,J Su9013 S0001A ^' J -3 SUBOIC J6 SUBOIG -BYP SUBOIF -BYP SUB01F- TOSV4MF2 S U SUBOIH -BYP Outlet -1 SWMF-I SUBOIH- TOSWMFI POA #2 FE1'CH-9 RR,yC11.10 A D SUH02A PC�13 f ��I FtE SUB028 VaF -3 ^ SUB030 -BYP C�pa�OH22 8U603E -B'f tiFFS!TE SUBT3E- BYP- ONSITE S0002C- BVP- OFFSITE SVJA -0F -i 9 SOS; G�ti° SU6G2C- BYP- 1,NSITE SUB02C- TOS! -4 SUB05- OFFSITE POA #3 �OH,1 4 R SUEJ3_. SUBO" SUB030 -BYP C�pa�OH22 8U603E -B'f tiFFS!TE SUBT3E- BYP- ONSITE HOLLY SPRINGS TC J. ALLEN, El KRG11010.ppc 10/7/2013 POP #5 9 SOS; G�ti° SUB05- OFFSITE SUB05- ONSITE HOLLY SPRINGS TC J. ALLEN, El KRG11010.ppc 10/7/2013 M" McADAMS Subsection: Master Network Summary Catchments Summary Label Scenario Return Hydrograph Time to Peak Peak Flow Event Volume (min) (ft3 /s) (years) (ac -ft) SUB01A Post 1 year 1 0.219 733.000 1.51 SUB01A Post 100 year 100 2.136 729.000 21.25 SUB01B Post 1 year 1 0.103 728.000 1.14 SUB01B Post 100 year 100 0.849 725.000 10.25 SUB01C Post 1 year 1 0.022 723.000 0.31 SUBOIC Post 100 year 100 0.185 721.000 2.83 SUBOID Post 1 year 1 0.021 722.000 0.40 SUBOID Post 100 year 100 0.123 721.000 1.92 SUB01E Post 1 year 1 0.156 753.000 0.88 SUB01E Post 100 year 100 1.857 729.000 18.46 SUBOIF -BYP Post 1 year 1 0.067 722.000 1.22 SUBOIF -BYP Post 100 year 100 0.422 721.000 6.56 SUBOIF- TOSWMF2 Post 1 year 1 4.772 721.000 103.85 SUB0IF-TOSWMF2 Post 100 year 100 17.138 721.000 256.50 SUBOIG -BYP Post 1 year 1 0.024 727.000 0.17 SUBOIG -BYP Post 100 year 100 0.308 721.000 4.53 SUBOIG-TOSWMF8 Post 1 year 1 0.827 722.000 17.08 SUB01G- TOSWMF8 Post 100 year 100 4.082 721.000 63.45 SUB01H -BYP Post 1 year 1 0.153 733.000 0.91 SUBOIH -BYP Post 100 year 100 1.689 729.000 17.62 SUB0IH-TOSWMF1 Post 1 year 1 1.576 721.000 34.19 SUB0IH-T0SWMF1 Post 100 year 100 5.366 721.000 79.27 SUBOII Post 1 year 1 0.087 726.000 0.89 SUB01I Post 100 year 100 0.897 721.000 13.48 SUB02A Post 1 year 1 0.029 752.000 0.16 SUB02A Post 100 year 100 0.439 725.000 5.14 SUB02B Post 1 year 1 0.109 734.000 0.76 SUB02B Post 100 year 100 1.056 729.000 10.63 SUB02C- TOSWMF3 Post 1 year 1 3.068 721.000 66.72 SUB02C- TOSWMF3 Post 100 year 100 10.729 721.000 159.58 SUB02C- BYP- ONSITE Post 1 year 1 0.068 730.000 0.41 SUB02C- BYP- ONSITE Post 100 year 100 0.803 725.000 9.61 SUB02C- TOSWMF4 Post 1 year 1 0.983 721.000 21.21 SUB02C- TOSWMF4 Post 100 year 100 3.938 721.000 60.10 SUB02C- BYP - OFFSITE Post 1 year 1 0.313 729.000 4.11 SUB02C- BYP - OFFSITE Post 100 year 100 1.708 728.000 18.21 SUB03A Post 1 year 1 0.030 726.000 0.28 SUB03A Post 100 year 100 0.329 721.000 4.92 SUB03C- TOSWMF5 Post 1 year 1 1.936 722.000 40.66 SUB03C- TOSWMF5 Post 100 year 100 8.976 721.000 139.05 SUB03C -BYP Post 1 year 1 0.031 727.000 0.25 SUB03C -BYP Post 100 year 100 0.372 721.000 5.51 SUB03E- BYP- OFFSITE Post 1 year 1 0.491 731.000 5.42 SUB03E- BYP- OFFSITE Post 100 year 100 3.104 729.000 31.00 HOLLY SPRINGS TC KRG11010.ppc J. ALLEN, PE 1/29/2015 W1 MCADAMS Subsection: Master Network Summary Catchments Summary Label Scenario Return Hydrograph Time to Peak Peak Flow Peak Flow Event Volume (min) (ft3 /s) (min) (ft3 /s) (years) (ac -ft) (years) SUB03E- BYP- ONSITE Post 1 year 1 0.049 726.000 0.46 SUB03E- BYP- ONSITE Post 100 year 100 0.541 721.000 8.08 SUB03D -BYP Post 1 year 1 0.026 727.000 0.21 SUB03D -BYP Post 100 year 100 0.310 721.000 4.60 SUB03D- TOSWMF6 Post 1 year 1 1.995 721.000 42.85 SUB03D- TOSWMF6 Post 100 year 100 8.223 721.000 126.00 SUB03B Post 1 year 1 0.004 726.000 0.04 SUB03B Post 100 year 100 0.044 721.000 0.66 SUB05- ONSITE Post 1 year 1 0.047 726.000 0.48 SUB05- ONSITE Post 100 year 100 0.485 721.000 7.29 SUB05- OFFSITE Post 1 year 1 0.594 727.000 8.64 SUB05- OFFSITE Post 100 year 100 3.611 725.000 44.65 Node Summary J. ALLEN, PE 1/29/2015 Label Scenario Return Hydrograph Time to Peak Peak Flow Event Volume (min) (ft3 /s) (years) (ac -ft) POA #1 Post 1 year 1 3.692 755.000 7.66 POA #1 Post 100 year 100 29.246 732.000 206.91 J -3 Post 1 year 1 3.378 753.000 5.83 3-3 Post 100 year 100 26.289 730.000 178.37 J -6 Post 1 year 1 3.338 754.000 5.69 J -6 Post 100 year 100 25.991 729.000 176.47 J -9 Post 1 year 1 0.600 751.000 1.74 J -9 Post 100 year 100 6.375 727.000 73.25 POA #2 Post 1 year 1 1.923 734.000 6.14 POA #2 Post 100 year 100 15.409 733.000 91.90 Post year 1 0.103 728.000 1.14 Post 100 year 100 0.849 725.000 10.25 Post 1 year 1 0.156 753.000 0.88 Post 100 year 100 1.857 729.000 18.46 Post 1 year 1 2.286 785.000 3.57 Post 100 year 100 14.011 754.000 43.92 Posts year 1 0.210 1,440.000 0.22 Post 100 year 100 3.034 727.000 38.18 Post 1 year 1 0.361 1,086.000 0.36 Post 100 year 100 3.791 727.000 47.18 Postl year 1 0.029 752.000 0.16 Post 100 year 100 0.439 725.000 5.14 Post 1 year 1 0.109 734.000 0.76 Post 100 year 100 1.056 729.000 10.63 Post 1 year 1 0.941 904.000 1.58 Post 100 year 100 8.500 752.000 41.62 HOLLY SPRINGS TC KRG11010.ppc J. ALLEN, PE 1/29/2015 'J McADAMS Subsection: Master Network Summary Node Summary Label Scenario Return Hydrograph Time to Peak Peak Flow Event Volume (min) (ft3 /s) (years) (ac -ft) 1 -4 Post 1 year 1 1.789 732.000 5.31 3-4 Post 100 year 100 13.925 732.000 78.31 Post 1 year 1 0.469 902.000 0.70 Post 100 year 100 2.919 751.000 16.94 Post 1 year 1 0.313 729.000 4.11 Post 100 year 100 1.708 728.000 18.21 Post 1 year 1 0.030 726.000 0.28 Post 100 year 100 0.329 721.000 4.92 Post 1 year 1 0.572 1,086.000 0.59 Post 100 year 100 7.413 755.000 21.87 Post 1 year 1 0.491 731.000 5.42 Post 100 year 100 3.104 729.000 31.00 Post 1 year 1 0.325 1,440.000 0.34 Post 100 year 100 6.422 753.000 29.07 1 Post 1 year 1 0.540 733.000 5.66 1 Post 100 year 100 3.643 731.000 34.16 Post 1 year 1 1.492 736.000 6.63 Post 100 year 100 18.151 734.000 74.73 POA #5 Post 1 year 1 0.641 728.000 9.10 POA #5 Post 100 year 100 4.094 727.000 49.72 Post 1 year 1 0.594 727.000 8.64 Post 100 year 100 3.611 725.000 44.65 Post 1 year 1 0.047 726.000 0.48 Post 100 year 100 0.485 721.000 7.29 POA #3 Post 1 year 1 1.524 737.000 6.80 POA #3 Post 100 year 100 18.518 735.000 76.68 Pond Summary Label Scenario Return Hydrograph Time to Peak Peak Flow Maximum Maximum Event Volume (min) (ft3 /s) Water Pond Storage (years) (ac -ft) Surface (ac -ft) Elevation (ft) SWMF -2 (IN) Post 1 year 1 4.772 721.000 103.85 (N /A) (N /A) SWMF -2 post 1 year 1 2.286 785.000 3.57 370.21 3.070 (OUT) SWMF -2 (IN) Post 100 year 100 17.138 721.000 256.50 (N /A) (N /A) SWMF -2 (OUT) Post 100 year 100 14.011 754.000 43.92 373.01 8.951 SWMF -8 (IN) Post 1 year 1 0.827 722.000 17.08 (N /A) (N /A) SWMF -8 (OUT) Post 1 year 1 0.210 1,440.000 0.22 353.89 0.617 SWMF -8 (IN) Post 100 year 100 4.082 721.000 63.45 (N /A) (N /A) HOLLY SPRINGS TC KRG11010.ppc J. ALLEN, PE 1/29/2015 '.JI MCADAMS Subsection: Master Network Summary Pond Summary Label Scenario Return Hydrograph Time to Peak Peak Flow Maximum Maximum Event Volume (min) (ft3 /s) Water Pond Storage (years) (ac -ft) Surface (ac -ft) Elevation (ft) SWMF -8 Post 100 year 100 3.034 727.000 38.18 355.87 1.383 (OUT) SWMF -1 (IN) Post 1 year 1 1.576 721.000 34.19 (N /A) (N /A) SWMF -1 post 1 year 1 0.361 1,086.000 0.36 382.41 1.227 (OUT) SWMF -1 (IN) Post 100 year 100 5.366 721.000 79.27 (N /A) (N /A) SWMF -1 Post 100 year 100 3.791 727.000 47.18 383.99 2.149 (OUT) SWMF -3 (IN) Post 1 year 1 3.068 721.000 66.72 (N /A) (N /A) SWMF -3 post 1 year 1 0.941 904.000 1.58 364.49 2.225 (OUT) SWMF -3 (IN) Post 100 year 100 10.729 721.000 159.58 (N /A) (N /A) SWMF -3 Post 100 year 100 8.500 752.000 41.62 366.77 4.533 (OUT) SWMF -4 (IN) Post 1 year 1 0.983 721.000 21.21 (N /A) (N /A) SWMF -4 post 1 year 1 0.469 902.000 0.70 361.23 0.611 (OUT) SWMF -4 (IN) Post 100 year 100 3.938 721.000 60.10 (N /A) (N /A) SWMF -4 Post 100 year 100 2.919 751.000 16.94 363.45 1.871 (OUT) SWMF -5 (IN) Post 1 year 1 1.936 722.000 40.66 (N /A) (N /A) SWMF -5 post 1 year 1 0.572 1,086.000 0.59 328.66 1.390 (OUT) SWMF -5 (IN) Post 100 year 100 8.976 721.000 139.05 (N /A) (N /A) SWMF -5 Post 100 year 100 7.413 755.000 21.87 332.45 4.528 (OUT) SWMF -6 (IN) Post 1 year 1 1.995 721.000 42.85 (N /A) (N /A) SWMF -6 Post 1 year 1 0.325 1,440.000 0.34 322.22 1.670 (OUT) SWMF -6 (IN) Post 100 year 100 8.223 721.000 126.00 (N /A) (N /A) SWMF -6 Post 100 year 100 6.422 753.000 29.07 324.78 4.026 (OUT) HOLLY SPRINGS TC J. 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I I " " I /I " ill / III // ,,, " / I / " 1 \, ---------------- __ - -- - ------- "I ; 11 " / I /,/ , I " I \ I // / � " ,-------- - __ - I 1 1 11 ; , , / /// / I 1 't / � .�_ ______ I I 11 I , \%� . ( / , ", ., 11 ------ _____­__��___ ______ \ 1 " I , / / " " / / ! ,,, 1 I '. - I . , I I (I I 0*1 \ THE JOHN R. MCADAMS I COMPANY, INC. 9.Qn-r% m,_rfrjjck-n pick-ruman-tr McADAm Durham, North Carolina 27713 Ucense No.: C-0293 S (800) 733-5646 m McAdamsCo.com O/ STORMWA TER MANA GEMENT FA CILITY #4 DESIGN CAL CULA TIONS HOLLY SPRINGS TC KRG -11010 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #4 KRG -11010 SSFxn Above NP STAGE - STORAGE FUNCTION - ABOVE NORMAL POOL __.. Accumulated Estimated Average Contour Stage Contour Contour Contour Stage Area Area (feet)_ (feet) (SF) (SF) 360.00 0.00— 20,459 123781 362.00 2.00 24,256 22358 364.00 4.00 27,174 25715 365.00 5.00 28,100 27637 140000 120000 - 100000 v 80000 - m rn f6 60000 - Cn 40000 - 20000 - 0 0.00 J. ALLEN, PE 8/22/2014 Incremental Accumulated Estimated Contour Contour Stage Volume Volume w/ S -S Fxn (CF) (CF) (feet) 44715 44715 2.00 51429 96145 3.99 27637 123781 5.01 Storage vs. Stage y = 20707x' 109 R = 1 11 2.00 3.00 4.00 5.00 6.00 Stage (feet) Ks = 20707 b = 1.1096 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #4 KRG -11010 SSFxn Below NP WETLAND ZONE TABULATION Per NCDWQ BMP Manual Zone Deep Pool Low Marsh High Marsh Woodv Unlar Zone Deep Pool Low Marsh High Marsh Woodv Uplar Depth at Normal Pool Depth at Temp Pool Portion of Wetland (inches) inches I Surface Area 18 to 36 18 to 48 20% 3 to 6 15 to 18 40% 0 to 3 0 to 15 30%-40% n/a 0 to 12 ; Remaining % Permanent Pool Elevation = Wetland Surface Area = Elevation (feet'. 358.50 to 357.00 359.75 to 359.50 360.00 to 359.75 n/a 360.00 20,459 Measured Area (SO 4,002 8,393 8.064 Portion of Wetland Surface Area 19.56% 41.02% 39.41 % 0.00% J. ALLEN, PE 8/22/2014 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #4 KRG -11010 WQV Calculation DETERMINATION OF WATER QUALITY VOLUME WQ v = (P)(R v)(,) 112 where, WQv= water quality volume (in acre -ft) Rv= 0.05 +0.009(I) where I is percent impervious cover A = area in acres P = rainfall (in inches) Input data: Total area, A = 8.28 acres Impervious area = 4.60 acres Percent impervious cover, I = 55.6 % Rainfall, P = 1.00 inches Calculated values: Rv= 0.55 WQv= 0.38 acre -ft 16531 cf. ASSOCIATED DEPTH IN POND WQv Stage /Storage Data: Ks b Zo Volume in 1" rainfall 16531 cf. 20707 1.110 360.00 16531 cu. ft Calculated values: Depth of WQv in Basin = 0.82 ft 9.80 inches Elevation = 360.82 ft J. ALLEN, PE 8/22/2014 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #4 KRG -11010 WQVDrawdown Calculation DRAWDOWN SIPHON DESIGN By comparison, if calculated by the average head over the orifice (assuming average head is half the total depth), the result would be: Average driving head on orifice = 0.356 feet Orifice composite loss coefficient = 0.600 Cross - sectional area of siphon = 0.034 sf Q= 0.0979 cfs Drawdown Time = Volume / Flowrate / 86400 (sec /day) Drawdown Time = 1.95 days J. ALLEN, PE 8/22/2014 D orifice = 2.5 inch # orifices = 1 Ks= 20707 b = 1.1096 Cd siphon = 0.60 Normal Pool Elevation = 360.00 feet Volume @ Normal Pool = 0 cf Orifice Invert = 360.00 feet WSEL @ 1" Runoff Volume = 360.82 feet WSEL Vol. Stored Siphon Flow Avg. Flow Incr. Vol. Incr. Time (feet) (cf) (cfs) (cfs) (cf) (sec) 360.82 16531 0.138 360.74 14935 0.131 0.135 1596 11847 360.67 13355 0.124 0.127 1579 12396 360.60 11794 0.116 0.120 1561 13048 360.53 10253 0.107 0.111 1541 13840 360.46 8735 0.098 0.102 1518 14835 360.39 7242 0.087 0.092 1493 16138 360.32 5780 0.076 0.081 1463 17964 360.25 4353 0.062 0.069 1427 20814 360.17 2972 0.040 0.051 1381 27083 360.10 1653 0.018 0.029 1319 44890 Drawdown Time = 2.23 days By comparison, if calculated by the average head over the orifice (assuming average head is half the total depth), the result would be: Average driving head on orifice = 0.356 feet Orifice composite loss coefficient = 0.600 Cross - sectional area of siphon = 0.034 sf Q= 0.0979 cfs Drawdown Time = Volume / Flowrate / 86400 (sec /day) Drawdown Time = 1.95 days J. ALLEN, PE 8/22/2014 'J McADAMS HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 Holly Springs Town Center - Phase 2 Subsection: Elevation -Area Volume Curve Return Event: 1 years Label: SWMF -4 Storm Event: 1 -Year Elevation Planimeter Area Al +A2 +sqr Volume Volume (Total) (ft) (ft2) (ft2) (Al *A2) (ac -ft) (ac -ft) (ft2) 360.00 0.0 20,461.000 0.000 0.000 0.000 362.00 0.0 24,264.000 67,006.510 1.026 1.026 364.00 0.0 27,388.000 77,430.721 1.185 2.211 365.00 0.0 28,376.000 83,641.623 0.640 2.851 HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 '='II Mc.ADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #4 Requested Pond Water Surface Elevations Minimum (Headwater) 360.00 ft Increment (Headwater) 0.20 ft Maximum (Headwater) 365.00 ft Outlet Connectivity Structure Type Outlet ID Direction Outfall Orifice -Area Orifice - 2 Forward Culvert - 1 Inlet Box Riser - 1 Forward Culvert - 1 Orifice - Circular Orifice - 1 Forward Culvert - 1 Culvert- Circular Culvert - 1 Forward TW Tailwater Settings Tailwater Return Event: 1 years Storm Event: 1 -Year E1 E2 (ft) (ft) 361.00 365.00 363.00 365.00 360.00 365.00 357.00 365.00 (N /A) (N /A) ACILLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 '2 McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #4 Structure ID: Riser- 1 Structure Type: Inlet Box Number of Openings Elevation Orifice Area Orifice Coefficient Weir Length Weir Coefficient K Reverse Manning's n Kev, Charged Riser Weir Submergence Orifice H to crest 1 363.00 ft 16.0 ft2 0.600 16.00 ft 3.00 (ft^0.5) /s 1.000 0.000 0.000 False False Return Event: 1 years Storm Event: 1 -Year .iOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 ' McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #4 Structure ID: Culvert- 1 Structure Type: Culvert- Circular Number of Barrels Diameter Length Length (Computed Barrel) Slope (Computed) Outlet Control Data Manning's n Ke Kb Kr Convergence Tolerance Inlet Control Data Equation Form K M C Y T1 ratio (HW /D) T2 ratio (HW /D) Slope Correction Factor Use unsubmerged inlet control 0 equation below T1 elevation. Use submerged inlet control 0 equation above T2 elevation In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 & T2... TI Elevation 359.30 ft T1 Flow T2 Elevation 359.60 ft T2 Flow 1 24.0 in 60.00 ft 60.01 ft 0.017 ft/ft 0.013 0.500 0.012 0.500 0.00 ft Form 1 0.0098 2.0000 0.0398 0.6700 1.152 1.298 -0.500 Return Event: 1 years Storm Event: 1 -Year 15.55 ft3 /S 17.77 ft3 /S .iOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 M" McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #4 Structure ID: Orifice - 1 Structure Type: Orifice- Circular Number of Openings Elevation Orifice Diameter Orifice Coefficient Structure ID: Orifice - 2 Structure Type: Orifice -Area Number of Openings Elevation Orifice Area Top Elevation Datum Elevation Orifice Coefficient 1 360.00 ft 2.5 in 0.600 1 361.00 ft 0.3 ft2 361.25 ft 361.00 ft 0.600 Structure ID: TW Structure Type: TW Setup, DS Channel Tailwater Type Free Outfall Convergence Tolerances Maximum Iterations 30 Tailwater Tolerance 0.01 ft (Minimum) Tailwater Tolerance 0.50 ft (Maximum) Headwater Tolerance 0.01 ft (Minimum) Headwater Tolerance 0.50 ft (Maximum) Flow Tolerance (Minimum) 0.001 ft3 /s Flow Tolerance (Maximum) 10.000 ft3 /s Return Event: 1 years Storm Event: 1 -Year .-IOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 'J McADAMS Holly Springs Town Center - Phase 2 Subsection: Composite Rating Curve Return Event: 1 years Label: SWMF #4 Storm Event: 1 -Year Composite Outflow Summary Water Surface Flow Elevation (ft3 /s) (ft) Tailwater Elevation Convergence Error Contributing Structures (ft) (ft) 360.00 0.00 (N /A) 0.00 (no Q: Orifice - 2,Riser - 1,Orifice - 1,Culvert - 1) 360.20 0.05 (N /A) 0.00 Orifice - 1,Culvert - 1 (no Q: Orifice - 2,Riser - 1) 360.40 0.09 (N /A) 0.00 Orifice - 1,Culvert - 1 (no Q: Orifice - 2,Riser - 1) 360.60 0.12 (N /A) 0.00 Orifice - 1,Culvert - 1 (no Q: Orifice - 2,Riser - 1) 360.80 0.14 (N /A) 0.00 Orifice - 1,Culvert - 1 (no Q: Orifice - 2,Riser - 1) 361.00 0.15 (N /A) 0.00 Orifice - 1,Culvert - 1 (no Q: Orifice - 2,Riser - 1) 361.20 0.65 (N /A) 0.00 Orifice - 2,Orifice - 1,Culvert - 1 (no Q: Riser - 1) 361.40 0.95 (N /A) 0.00 Orifice - 2,Orifice - 1,Culvert - 1 (no Q: Riser - 1) 361.60 1.13 (N /A) 0.00 Orifice - 2,Orifice - 1,Culvert - 1 (no Q: Riser - 1) 361.80 1.29 (N /A) 0.00 Orifice - 2,Orifice - 1,Culvert - 1 (no Q: Riser - 1) 362.00 1.43 (N /A) 0.00 Orifice - 2,Orifice - 1,Culvert - 1 (no Q: Riser - 1) 362.20 1.55 (N /A) 0.00 Orifice - 2,Orifice - 1,Culvert - 1 (no Q: Riser - 1) 362.40 1.67 (N /A) 0.00 Orifice - 2,Orifice - 1,Culvert - 1 (no Q: Riser - 1) 362.60 1.78 (N /A) 0.00 Orifice - 2,Orifice - 1,Culvert - 1 (no Q: Riser - 1) 362.80 1.88 (N /A) 0.00 Orifice - 2,Orifice - 1,Culvert - 1 (no Q: Riser - 1) 363.00 1.98 (N /A) 0.00 Orifice - 2,Orifice - 1,Culvert - 1 (no Q: Riser - 1) 363.20 6.37 (N /A) 0.00 Orifice - 2,Riser - 1,Orifice - 1,Culvert - 1 363.40 14.29 (N /A) 0.00 Orifice - 2,Riser - 1,Orifice - 1,Culvert - 1 363.60 24.51 (N /A) 0.00 Orifice - 2,Riser - 1,Orifice - 1,Culvert - 1 363.80 35.26 (N /A) 0.00 Orifice - 2,Riser - 1,Orifice - 1,Culvert - 364.00 37.52 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2,Orifice - 1) 364.20 38.18 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2,Orifice - 1) AOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 'J Mc- ADaMs Holly Springs Town Center - Phase 2 Subsection: Composite Rating Curve Return Event: 1 years Label: SWMF #4 Storm Event: 1 -Year Composite Outflow Summary Water Surface Flow Tailwater Elevation Convergence Error Contributing Structures Elevation (ft3 /s) (ft) (ft) (ft) 364.40 38.82 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2,Orifice - 1) 364.60 39.45 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2,Orifice - 1) 364.80 40.08 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2,Orifice - 1) 365.00 40.69 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2,Orifice - 1) iOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 Rill McADAMS Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Label: SWMF -4 (IN) Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions Elevation (Water Surface, 360.00 ft Initial) 0.983 ac -ft Volume (Initial) 0.000 ac -ft Flow (Initial Outlet) 0.00 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 0.00 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 21.21 ft3 /s Flow (Peak Outlet) 0.70 ft3 /s Elevation (Water Surface, 361.23 ft Pea k) Volume (Peak) 0.611 ac -ft Mass Balance (ac -ft) Volume (Initial) 0.000 ac -ft Volume (Total Inflow) 0.983 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 0.469 ac -ft Outflow) Volume (Retained) 0.514 ac -ft Volume (Unrouted) -0.001 ac -ft Error (Mass Balance) 0.1 % Time to Peak (Flow, In) Time to Peak (Flow, Outlet) Return Event: 1 years Storm Event: 1 -Year 721.000 min 902.000 min 10LLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 �JI McADAMS Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Return Event: 10 years Label: SWMF -4 (IN) Storm Event: 10 -Year Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions 0.000 ac -ft Elevation (Water Surface, 360.00 ft Initial) 0.000 ac -ft Volume (Initial) 0.000 ac -ft Flow (Initial Outlet) 0.00 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 0.00 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 42.52 ft3 /s Flow (Peak Outlet) 1.84 ft3 /s Elevation (Water Surface, 362.73 ft Peak) Volume (Peak) 1.439 ac -ft Mass Balance (ac -ft) Volume (Initial) 0.000 ac -ft Volume (Total Inflow) 2.311 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 1.539 ac -ft Outflow) Volume (Retained) 0.770 ac -ft Volume (Unrouted) -0.002 ac -ft Error (Mass Balance) 0.1 % Time to Peak (Flow, In) 721.000 min Time to Peak (Flow, Outlet) 786.000 min HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 '="J' MCADAMS Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Return Event: 100 years Label: SWMF -4 (IN) Storm Event: 100 -Year Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions 0.000 ac -ft Elevation (Water Surface, 360.00 ft Initial) 0.000 ac -ft Volume (Initial) 0.000 ac -ft Flow (Initial Outlet) 0.00 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 0.00 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 60.10 ft3 /s Flow (Peak Outlet) 16.94 ft3 /s Elevation (Water Surface, 363.45 ft Peak) Volume (Peak) 1.871 ac -ft Mass Balance (ac -ft) Volume (Initial) 0.000 ac -ft Volume (Total Inflow) 3.938 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 2.919 ac -ft Outflow) Volume (Retained) 1.017 ac -ft Volume (Unrouted) -0.002 ac -ft Error (Mass Balance) 0.1% Time to Peak (Flow, In) 721.000 min Time to Peak (Flow, Outlet) 751.000 min HOLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 8/22/2014 'J McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Return Event: 100 years Label: SWMF #4 -WC Storm Event: 100 -Year Requested Pond Water Surface Elevations Minimum (Headwater) 360.00 ft Increment (Headwater) 0.20 ft Maximum (Headwater) 365.00 ft Outlet Connectivity Structure Type Outlet ID Direction Outfall El E2 (ft) (ft) Inlet Box Riser - 1 Forward Culvert - 1 363.00 365.00 Orifice -Area Orifice - 2 Forward Culvert - 1 361.00 365.00 Culvert- Circular Culvert - 1 Forward TW 357.00 365.00 Tailwater Settings Tailwater (N /A) (N /A) ,10LLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 '.-'!I MCADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #4 -WC Structure ID: Riser- 1 Structure Type: Inlet Box Number of Openings Elevation Orifice Area Orifice Coefficient Weir Length Weir Coefficient K Reverse Manning's n Kev, Charged Riser Weir Submergence Orifice H to crest 1 363.00 ft 16.0 ftz 0.600 16.00 ft 3.00 (ft ^0.5) /s 1.000 0.000 0.000 False Fa Ise Return Event: 100 years Storm Event: 100 -Year , -IOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 'J McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #4 -WC Structure ID: Culvert- 1 Structure Type: Culvert- Circular Number of Barrels Diameter Length Length (Computed Barrel) Slope (Computed) Outlet Control Data Manning's n Ke Kb Kr Convergence Tolerance Inlet Control Data Equation Form K M C Y T1 ratio (HW /D) T2 ratio (HW /D) Slope Correction Factor Use unsubmerged inlet control 0 equation below T1 elevation. Use submerged inlet control 0 equation above T2 elevation In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 & T2... T1 Elevation 359.30 ft T1 Flow T2 Elevation 359.60 ft T2 Flow 1 24.0 in 60.00 ft 60.01 ft 0.017 ft/ft 0.013 0.500 0.012 0.500 0.00 ft Form 1 0.0098 2.0000 0.0398 0.6700 1.152 1.298 -0.500 Return Event: 100 years Storm Event: 100 -Year 15.55 ft3 /s 17.77 ft3 /S HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 pi u•• Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #4 -WC Structure ID: Orifice - 2 Structure Type: Orifice -Area Number of Openings Elevation Orifice Area Top Elevation Datum Elevation Orifice Coefficient 1 361.00 ft 0.3 ft2 361.25 ft 361.00 ft 0.600 Structure ID: TW Structure Type: TW Setup, DS Channel Tailwater Type Free Outfall Convergence Tolerances Maximum Iterations 30 Tailwater Tolerance 0.01 ft (Minimum) Tailwater Tolerance 0.50 ft (Maximum) Headwater Tolerance 0.01 ft (Minimum) Headwater Tolerance 0.50 ft (Maximum) Flow Tolerance (Minimum) 0.001 ft3 /s Flow Tolerance (Maximum) 10.000 ft3 /s Return Event: 100 years Storm Event: 100 -Year HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 'J McADAMS Subsection: Composite Rating Curve Label: SWMF #4 -WC Composite Outflow Summary Water Surface Flow Elevation (ft3 /s) (ft) Holly Springs Town Center - Phase 2 Return Event: 100 years Storm Event: 100 -Year Tailwater Elevation Convergence Error Contributing Structures (ft) (ft) 360.00 0.00 (N /A) 0.00 (no Q: Riser - 1,Orifice - 2,Culvert - 1) 360.20 0.00 (N /A) 0.00 (no Q: Riser - 1,Orifice - 2,Culvert - 1) 360.40 0.00 (N /A) 0.00 (no Q: Riser - 1,Orifice - 2,Culvert - 1) 360.60 0.00 (N /A) 0.00 (no Q: Riser - 1,Orifice - 2,Culvert - 1) 360.80 0.00 (N /A) 0.00 (no Q: Riser - 1,Orifice - 2,Culvert - 1) 361.00 0.00 (N /A) 0.00 (no Q: Riser - 1,Orifice - 2,Culvert - 1) 361.20 0.48 (N /A) 0.00 Orifice - 2,Culvert - 1 (no Q: Riser - 1) 361.40 0.76 (N /A) 0.00 Orifice - 2,Culvert - 1 (no Q: Riser - 1) 361.60 0.93 (N /A) 0.00 Orifice - 2,Culvert - 1 (no Q: Riser - 1) 361.80 1.08 (N /A) 0.00 Orifice - 2,Culvert - 1 (no Q: Riser - 1) 362.00 1.20 (N /A) 0.00 Orifice - 2,Culvert - 1 (no Q: Riser - 1) 362.20 1.32 (N /A) 0.00 Orifice - 2,Culvert - 1 (no Q: Riser - 1) 362.40 1.42 (N /A) 0.00 Orifice - 2,Culvert - 1 (no Q: Riser - 1) 362.60 1.52 (N /A) 0.00 Orifice - 2,Culvert - 1 (no Q: Riser - 1) 362.80 1.61 (N /A) 0.00 Orifice - 2,Culvert - 1 (no Q: Riser - 1) 363.00 1.70 (N /A) 0.00 Orifice - 2,Culvert - 1 (no Q: Riser - 1) 363.20 6.08 (N /A) 0.00 Riser - 1,Orifice - 2,Culvert - 1 363.40 14.00 (N /A) 0.00 Riser - 1,Orifice - 2,Culvert - 1 363.60 24.25 (N /A) 0.00 Riser - 1,Orifice - 2,Culvert - 1 363.80 35.17 (N /A) 0.00 Riser - 1,Orifice - 2,Culvert - 1 364.00 37.52 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2) 364.20 38.18 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2) 364.40 38.82 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2) 364.60 39.45 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2) 364.80 40.08 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2) 365.00 40.69 (N /A) 0.00 Riser - 1,Culvert - 1 (no Q: Orifice - 2) HOLLY SPRINGS TC KRG11010.ppc J. ALLEN, PE 8/22/2014 1111 McADAMs Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Return Event: 100 years Label: SWMF -4 (IN) Storm Event: 100 -Year Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions 1.600 ac -ft Elevation (Water Surface, 363.00 ft Initial) 0.000 ac -ft Volume (Initial) 1.600 ac -ft Flow (Initial Outlet) 1.70 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 1.70 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 60.10 ft3 /s Time to Peak (Flow, In) 721.000 min Flow (Peak Outlet) 29.33 ft3 /s Time to Peak (Flow, Outlet) 728.000 min Elevation (Water Surface, 363.69 ft Peak) Volume (Peak) 2.019 ac -ft Mass Balance (ac -ft) Volume (Initial) 1.600 ac -ft Volume (Total Inflow) 3.938 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 4.383 ac -ft Outflow) Volume (Retained) 1.153 ac -ft Volume (Unrouted) -0.002 ac -ft Error (Mass Balance) 0.0% HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 8/22/2014 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #4 KRG -11010 Anti- Flotation Block Calculations RISER ANTI - FLOTATION CALCULATION Input Data = => Inside length of riser = 4.00 feet Inside width of riser = 4.00 feet Wall thickness of riser = 6.00 inches Base thickness of riser = 6.00 inches Base length of riser = 5.00 feet Base width of riser = 5.00 feet Inside height of Riser = 6.00 feet Concrete unit weight = 142.0 PCF OD of barrel exiting manhole = 24.00 inches Size of drain pipe (if present) = 8.0 inches Trash Rack water displacement = 52.67 CF Concrete Present in Riser Structure = => Total amount of concrete: Adjust for openings: Base of Riser = 12.500 CF Riser Walls = 54.000 CF Opening for barrel = 1.571 CF Opening for drain pipe = 0.175 CF Total Concrete present, adjusted for openings = 64.755 CF Weight of concrete present = 9195 lbs Amount of water displaced by Riser Structure = => Displacement by concrete = 64.755 CF Displacement by open air in riser = 96.000 CF Displacement by trash rack = 52.670 CF Total water displaced by riser/barrel structure = 213.425 CF Weight of water displaced = 13318 lbs J. ALLEN, PE 12/17/2013 Note: NC Products lists unit wt. of manhole concrete at 142 PCF. HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #4 KRG -11010 Anti- Flotation Block Calculations Calculate amount of concrete to be added to riser = => Safety factor to use = Must add = Concrete unit weight for use = Buoyant weight of this concrete = Buoyant, with safety factor applied = Therefore, must add = Standard based described above = Therefore, base design must have = Calculate size of base for riser assembly = => Length = Width = Thickness = Concrete Present = Check validity of base as designed = => Total Water Displaced = Total Concrete Present = Total Water Displaced = Total Concrete Present = Actual safety factor Results of design = => Base length = Base width = Base Thickness = CY of concrete total in base = Concrete unit weight in added base >_ 1.15 (recommend 1.15 or higher) 6120 lbs concrete for buoyancy 142 PCF (note above observation for NCP concrete) 79.60 PCF 69.22 PCF 88.420 CF of concrete 12.500 CF of concrete 100.920 CF of concrete 8.000 feet 8.000 feet 19.0 inches 101.333 CF 302.258 CF 153.588 CF 18861 lbs 21809 lbs 1.16 OK 8.00 feet 8.00 feet 19.00 inches 3.75 CY 142 PCF OK J. ALLEN, PE 12/17/2013 25 �- 20 —j I \ 15 ( II d 10 > I I I f I 5 of 0 1 2 Figure 8.06.b.1 T-14-7r- 3 4 5 Pipe diameter (ft) 12/17/2013 JCA Zone from graph above = DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET Project HOLLY SPRINGS TC Date Project No. KRG -11010 Designer Outlet ID SWMF #4 Flow, Qlo_y, 1.84 cfs Slope, S 1.67 % Pipe Diameter, D,, 24 inches Pipe Diameter, Do 2 feet Number of pipes 1 Pipe separation 0 feet 25 �- 20 —j I \ 15 ( II d 10 > I I I f I 5 of 0 1 2 Figure 8.06.b.1 T-14-7r- 3 4 5 Pipe diameter (ft) 12/17/2013 JCA Zone from graph above = 1 Outlet pipe diameter 24 in. Outlet flowrate 1.8 cfs Outlet velocity 5.2 ft/sec Material = Class A 6 7 8 9 10 Length = 8.0 ft. Width = 6.0 ft. Stone diameter = 4 in. Thickness = 9 in. Zone 1 I Material Class A Diameter 4 Thickness 9 Length 4 x D(o) Width 3 x D(o) 2 Class B 8 22 6 x D(o) 3 x D(o) 3 Class I 10 22 8 x D(o) 3 x D(o) 4 Class 1 10 22 8 x D(o) 3 x D(o) 5 Class 11 14 27 10 x D(o) 3 x D(o) 6 Class H 14 27 10 x D(o) 3 x D(o) 7 i Special study required 1. Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual 2. Outlet velocity based on full -flow velocity Rip Rap Outlet Protection Design.xlsm 12/17/2013 STORMWA TER MANA GEMENT FA CILITY #5 DESIGN CAL CULA TIONS HOLLY SPRINGS TC KRG -11010 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #5 J. ALLEN, PE, CFM KRG -11010 SSFxn Above NP 8/21/2014 STAGE - STORAGE FUNCTION - ABOVE NORMAL POOL Contour (feet) Stage (feet) Contour Area (SF) Average Contour Area (SF) Incremental Contour Volume (CF) Accumulated Contour Volume (CF) Estimated Stage w/ S -S Fxn (feet) 326.50 0.00 22,405 327.00 0.50 26,970 24688 12344 12344 0.51 328.00 1.50 29,465 28218 28218 40561 1.47 330.00 3.50 34,625 32045 64090 104651 3.40 332.00 5.50 40,011 37318 74636 179287 5.48 334.00 7.50 45,623 42817 85634 264921 7.75 Storage vs. Stage 300000 250000 - -. 200000 - W U 150000 - m 0 U) 100000 - 50000 -- 0 0.00 2.00 4.00 6.00 Stage (feet) Ks = 263231 b = 1.1277 +I 8.00 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #5 J. ALLEN, PE, CFM KRG -11010 SSFxn Main Pool 8/21/2014 STAGE - STORAGE FUNCTION - MAIN POOL 90000 - 80000 — 70000 — LL 60000 — v 50000 — d a� 40000 — 0 CO 30000 — 20000 — 10000 — 0 0.00 Storage vs. Stage 2.00 4.00 6.00 8.00 10.00 Stage (feet) Ks = 50841 b = 1.2881 Average Incremental Accumulated Estimated Contour Contour Contour Contour Stage Contour Stage Area Area Volume Volume w/ S -S Fxn (feet) (feet) (SF) (SF) (CF) (CF) (feet) 318.00 0.00 5,617 320.00 2.00 7,168 6393 12785 12785 2.05 322.00 4.00 9,093 8131 16261 29046 3.87 324.00 6.00 11,440 10267 20533 49579 5.86 326.00 8.00 13,959 12700 25399 74978 8.08 326.50 8.50 16,781 15370 7685 82663 8.71 90000 - 80000 — 70000 — LL 60000 — v 50000 — d a� 40000 — 0 CO 30000 — 20000 — 10000 — 0 0.00 Storage vs. Stage 2.00 4.00 6.00 8.00 10.00 Stage (feet) Ks = 50841 b = 1.2881 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #5 J. ALLEN, PE, CFM KRG -11010 SSFxn Forebay 8/21/2014 STAGE - STORAGE FUNCTION - FOREBAY 25000 - 20000 — LL 15000 — d �a `0 10000 5000 — 0 0.00 Storage vs. Stage y = $20.3X1.5213 R2 = 0.9971 I 1 1 2.00 4.00 6.00 Stage (feet) Ks = 820.3 b = 1.5213 I I i 8.00 10.00 Average Incremental Accumulated Estimated Contour Contour Contour Contour Stage Contour Stage Area Area Volume Volume w/ S -S Fxn (feet) (feet) (SF) (SF) (CF) (CF) (feet) 318.00 0.00 904 320.00 2.00 1,550 1227 2454 2454 2.06 322.00 4.00 2,352 1951 3902 6356 3.84 324.00 6.00 3,307 2830 5659 12015 5.84 326.00 8.00 4,415 3861 7722 19737 8.09 326.50 8.50 5,624 5020 2510 22247 8.75 25000 - 20000 — LL 15000 — d �a `0 10000 5000 — 0 0.00 Storage vs. Stage y = $20.3X1.5213 R2 = 0.9971 I 1 1 2.00 4.00 6.00 Stage (feet) Ks = 820.3 b = 1.5213 I I i 8.00 10.00 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #5 KRG -11010 Volume Calculation TOTAL VOLUME OF FACILITY Volume of Main Pool = 82,663 cf Volume of Forebay = 22,247 cf Total Volume Below NWSE = 104,910 cf = 2.41 acre -ft Total Volume Above NWSE = 264,921 cf 6.08 acre -ft Total Volume of Facility= 369,831 cf 8.49 acre -ft FOREBAY PERCENTAGE OF PERMANENT POOL VOLUME Per NCDWQ design guidelines, the forebay volume should equal approximately 20% of the total permanent pool volume. Total Volume Below NWSE = 104,910 cf Volume of Forebay = 22,247 cf % Forebay = 21.2% AVERAGE DEPTH OF POND Total Volume Below NWSE = 104,910 cf Surface Area at NWSE = 22,405 sf Average Depth = 4.68 ft J. ALLEN, PE, CFM 8/21/2014 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #5 J. ALLEN, PE, CFM KRG -11010 Surface Area Calculation 8/21/2014 WET DETENTION BASIN SUMMARY From Stormwater Best Management Practices Manual. NCDENR: Division of Water Quality, 1999. Enter the drainage area characteristics = => Total drainage area to pond = 21.02 acres Total impervious area to pond = 10.16 acres Note The basin must be sized to treat all impervious surface runoff draining into the pond, not just the impervious surface from on -site development. Drainage area = 21.02 acres @ 48.3% impervious Estimate the surface area required at pond normal pool elevation = => Wet Detention Basins are based on an minimum average depth of From the DWQ BMP Handbook (1999), the required SAIDA ratio for 4.5 4.68 Lower Boundary => 40.0 1.90 Site % impervious => 48.3 2.23 2.14 Upper Boundary => 50.0 2.30 Therefore, SA/DA required = 2.14 4.68 feet (Calculated) 90% TSS Removal =_> 5.0 1.80 1.97 2.00 Surface area required at normal pool = 19,554 ft 0.45 acres Surface area provided at normal pool = 22,405 ft2 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #5 KRG -11010 WQV Calculation DETERMINATION OF WATER QUALITY VOLUME WQ v = (P)(R v)(A) 112 where, WQv = water quality volume (in acre -ft) Rv= 0.05 +0.009(I) where I is percent impervious cover A = area in acres P = rainfall (in inches) Input data: Total area, A = 21.02 acres Impervious area = 10.16 acres Percent impervious cover, I = 48.3 % Rainfall, P = 1.00 inches Calculated values: Rv= 0.48 WQv= 0.85 acre -ft 36996 cf. ASSOCIATED DEPTH IN POND WQv Stage /Storage Data: Ks b Zo Volume in 1" rainfall 36996 c£ 26323 1.128 326.50 36996 cu. ft Calculated values: Depth of WQv in Basin = 1.35 ft 16.23 inches Elevation = 327.85 ft J. ALLEN, PE, CFM 8/21/2014 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #5 KRG -11010 WQVDrawdown Calculation DRAWDOWN SIPHON DESIGN Drawdown Time = 2.40 days By comparison, if calculated by the average head over the orifice (assuming average head is half the total depth), the result would be: Average driving head on orifice = 0.614 feet Orifice composite loss coefficient = 0.600 Cross - sectional area of siphon = 0.049 sf Q= 0.1852 cfs Drawdown Time = Volume / Flowrate / 86400 (sec /day) Drawdown Time = 2.31 days J. ALLEN, PE, CFM 8/21/2014 D orifice = 3 inch # orifices = 1 Ks= 26323 b = 1.1277 Cd siphon = 0.60 Normal Pool Elevation = 326.50 feet Volume @ Normal Pool = 0 cf Orifice Invert = 326.50 feet WSEL @ V Runoff Volume = 327.85 feet WSEL Vol. Stored Siphon Flow Avg. Flow Incr. Vol. Incr. Time (feet) (cf) (cfs) (cfs) (cf) (sec) 327.85 36996 0.261 327.73 33386 0.249 0.255 3610 14156 327.62 29820 0.235 0.242 3566 14748 327.50 26302 0.221 0.228 3518 15442 327.38 22836 0.205 0.213 3466 16274 327.26 19429 0.189 0.197 3407 17299 327.15 16089 0.170 0.179 3340 18610 327.03 12825 0.150 0.160 3263 20377 326.91 9654 0.126 0.138 3171 22972 326.79 6599 0.097 0.111 3056 27412 326.68 3700 0.049 0.073 2899 39710 Drawdown Time = 2.40 days By comparison, if calculated by the average head over the orifice (assuming average head is half the total depth), the result would be: Average driving head on orifice = 0.614 feet Orifice composite loss coefficient = 0.600 Cross - sectional area of siphon = 0.049 sf Q= 0.1852 cfs Drawdown Time = Volume / Flowrate / 86400 (sec /day) Drawdown Time = 2.31 days J. ALLEN, PE, CFM 8/21/2014 "U MCADAMS JLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/25/2014 Holly Springs Town Center - Phase 2 Subsection: Elevation -Area Volume Curve Return Event: 1 years Label: SWMF -5 Storm Event: 1 -Year Elevation Planimeter Area Al +A2 +sqr Volume Volume (Total) (ft) (ftz) (acres) (Al *A2) (ac -ft) (ac -ft) (acres) 326.50 0.0 0.514 0.000 0.000 0.000 327.00 0.0 0.619 1.698 0.283 0.283 328.00 0.0 0.676 1.943 0.648 0.931 330.00 0.0 0.795 2.205 1.470 2.400 332.00 0.0 0.919 2.568 1.712 4.112 334.00 0.0 1.047 2.947 1.964 6.077 JLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/25/2014 ''J McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #5 Return Event: 1 years Storm Event: 1 -Year Requested Pond Water Surface Elevations. Minimum (Headwater) 326.50 ft Increment (Headwater) 0.20 ft Maximum (Headwater) 334.00 ft Outlet Connectivity Structure Type Outlet ID Direction Outfall El E2 (ft) (ft) Orifice -Area Orifice Forward Culvert 328.80 334.00 Inlet Box Riser Forward Culvert 332.30 334.00 Orifice - Circular Siphon Forward Culvert 326.50 334.00 Culvert- Circular Culvert Forward TW 322.50 334.00 Tailwater Settings Tailwater (N /A) (N /A) OLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/25/2014 11 U MCADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #5 Structure ID: Riser Structure Type: Inlet Box Number of Openings Elevation Orifice Area Orifice Coefficient Weir Length Weir Coefficient K Reverse Manning's n Kev, Charged Riser Weir Submergence Orifice H to crest 1 332.30 ft 16.0 ftz 0.600 16.00 ft 3.00 (ft ^0.5) /s 1.000 0.000 0.000 False False Return Event: 1 years Storm Event: 1 -Year JLLY SPRINGS TC J. ALLEN, PE RRG11010.ppc 11/25/2014 01 U MCADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #5 Structure ID: Culvert Structure Type: Culvert- Circular Number of Barrels Diameter Length Length (Computed Barrel) Slope (Computed) Outlet Control Data Manning's n Ke Kb Kr Convergence Tolerance Inlet Control Data Equation Form K M C Y TI ratio (HW /D) T2 ratio (HW /D) Slope Correction Factor Use unsubmerged inlet control 0 equation below T1 elevation. Use submerged inlet control 0 equation above T2 elevation In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 & T2... T1 Elevation T2 Elevation 322.50 ft T1 Flow 325.10 ft T2 Flow 1 24.0 in 57.00 ft 57.00 ft 0.009 ft/ft 0.013 0.500 0.012 0.500 0.00 ft Form 1 0.0098 2.0000 0.0398 0.6700 0.000 1.302 -0.500 Return Event: 1 years Storm Event: 1 -Year 15.55 ft3 /S 17.77 ft3 /S JLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/25/2014 I McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #5 Structure ID: Siphon Structure Type: Orifice- Circular Number of Openings Elevation Orifice Diameter Orifice Coefficient Structure ID: Orifice Structure Type: Orifice -Area Number of Openings Elevation Orifice Area Top Elevation Datum Elevation Orifice Coefficient 1 326.50 ft 4.0 in 0.600 2 328.80 ft 1.0 ftz 329.30 ft 329.05 ft 0.600 Structure ID: TW Structure Type: TW Setup, DS Channel Tailwater Type Free Outfall Convergence Tolerances Maximum Iterations 30 Tailwater Tolerance 0.01 ft (Minimum) Tailwater Tolerance 0.50 ft (Maximum) Headwater Tolerance 0.01 ft (Minimum) Headwater Tolerance 0.50 ft (Maximum) Flow Tolerance (Minimum) 0.001 ft3 /s Flow Tolerance (Maximum) 10.000 ft3 /s Return Event: 1 years Storm Event: 1 -Year JLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/25/2014 11 U MCADAMS Holly Springs Town Center - Phase 2 Subsection: Composite Rating Curve Label: SWMF #5 Composite Outflow Summary Return Event: 1 years Storm Event: 1 -Year Water Surface Flow Tailwater Elevation Convergence Error Contributing Structures Elevation (ft3 /s) (ft) (ft) (ft) 326.50 0.00 (N /A) 0.00 (no Q: Orifice, Riser, Siphon,Culvert) 326.70 0.07 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 326.90 0.20 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 327.10 0.28 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 327.30 0.33 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 327.50 0.38 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 327.70 0.42 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 327.90 0.46 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 328.10 0.50 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 328.30 0.54 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 328.50 0.57 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 328.70 0.60 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 328.80 0.61 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 328.90 1.59 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 329.10 3.54 (N /A) 0.00 Orifice, Siphon, Culvert (no Q: Riser) 329.30 5.49 (N /A) 0.00 Orifice, Siphon,Culvert (no Q: Riser) 329.50 7.16 (N /A) 0.00 Orifice, Siphon,Culvert (no Q: Riser) 329.70 8.49 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 329.90 9.63 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 330.10 10.64 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 330.30 11.56 (N /A) 0.00 Orifice, Siphon, Culvert (no Q: Riser) 330.50 12.40 (N /A) 0.00 Orifice, Siphon,Culvert (no Q: Riser) 330.70 13.21 (N /A) 0.00 Orifice, Siphon,Culvert (no Q: Riser) 330.90 13.95 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 331.10 14.67 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 331.30 15.34 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 331.50 15.99 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 331.70 16.61 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 331.90 17.22 (N /A) 0.00 Orifice, Siphon,Culvert (no Q: Riser) 332.10 17.78 (N /A) 0.00 Orifice, Siphon,Culvert (no Q: Riser) 332.30 18.35 (N /A) 0.00 Orifice, Siphon,Culvert (no Q: Riser) 332.50 23.18 (N /A) 0.00 Orifice,Riser,Siphon,Culvert 332.70 31.45 (N /A) 0.00 Orifice, Riser, Siphon,Culvert 332.90 39.25 (N /A) 0.00 Orifice, Riser,Siphon,Culvert 333.10 44.95 (N /A) 0.00 Orifice, Riser,Siphon,Culvert 333.30 48.45 (N /A) 0.00 Orifice, Riser,Siphon,Culvert 333.50 48.97 (N /A) 0.00 Riser,Culvert (no Q: Orifice,Siphon) 333.70 49.47 (N /A) 0.00 Riser,Culvert (no Q: Orifice,Siphon) 333.90 49.97 (N /A) 0.00 Riser,Culvert (no Q: Orifice,Siphon) 334.00 50.22 (N /A) 0.00 Riser,Culvert (no Q: Orifice,Siphon) JLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/25/2014 11 U MCADAMS Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Return Event: 1 years Label: SWMF -5 (IN) Storm Event: 1 -Year Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions 0.000 ac -ft Elevation (Water Surface, 326.50 ft Initial) 0.000 ac -ft Volume (Initial) 0.000 ac -ft Flow (Initial Outlet) 0.00 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 0.00 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 40.66 ft3 /s Time to Peak (Flow, In) 722.000 min Flow (Peak Outlet) 0.59 ft3 /s Time to Peak (Flow, Outlet) 1,086.000 min Elevation (Water Surface, 328.66 ft Peak) Volume (Peak) 1.390 ac -ft Mass Balance (ac -ft) Volume (Initial) 0.000 ac -ft Volume (Total Inflow) 1.936 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 0.572 ac -ft Outflow) Volume (Retained) 1.363 ac -ft Volume (Unrouted) -0.001 ac -ft Error (Mass Balance) 0.1% ALLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/25/2014 I MCADAMS Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Label: SWMF -5 (IN) Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions Elevation (Water Surface, 326.50 ft Initial) 5.030 ac -ft Volume (Initial) 0.000 ac -ft Flow (Initial Outlet) 0.00 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 0.00 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 92.80 ft3 /s Flow (Peak Outlet) 11.32 ft3 /s Elevation (Water Surface, 330.25 ft Peak) Volume (Peak) 2.598 ac -ft Mass Balance (ac -ft) Volume (Initial) 0.000 ac -ft Volume (Total Inflow) 5.030 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 3.497 ac -ft Outflow) Volume (Retained) 1.531 ac -ft Volume (Unrouted) -0.002 ac -ft Error (Mass Balance) 0.0% Time to Peak (Flow, In) Time to Peak (Flow, Outlet) Return Event: 10 years Storm Event: 10 -Year 721.000 min 755.000 min ALLY SPRINGS TC J. ALLEN, PE ..RG11010.ppc 11/28/2014 14 B MCADAMS Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Return Event: 100 years Label: SWMF -5 (IN) Storm Event: 100 -Year Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions 0.000 ac -ft Elevation (Water Surface, 326.50 ft Initial) 0.000 ac -ft Volume (Initial) 0.000 ac -ft Flow (Initial Outlet) 0.00 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 0.00 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 139.05 ft3 /s Time to Peak (Flow, In) 721.000 min Flow (Peak Outlet) 21.87 ft3 /s Time to Peak (Flow, Outlet) 755.000 min Elevation (Water Surface, 332.45 ft Peak) Volume (Peak) 4.528 ac -ft Mass Balance (ac -ft) Volume (Initial) 0.000 ac -ft Volume (Total Inflow) 8.976 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 7,413 ac -ft Outflow) Volume (Retained) 1.561 ac -ft Volume (Unrouted) -0.002 ac -ft Error (Mass Balance) 0.0% JLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 11/25/2014 "J MCADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #5 - WC Return Event: 100 years Storm Event: 100 -Year Requested Pond Water Surface Elevations Minimum (Headwater) 326.50 ft Increment (Headwater) 0.20 ft Maximum (Headwater) 334.00 ft Outlet Connectivity Structure Type Outlet ID Direction Outfall El E2 (ft) (ft) Inlet Box Riser Forward Culvert 332.30 334.00 Orifice -Area Orifice Forward Culvert 328.80 334.00 Culvert- Circular Culvert Forward TW 322.50 334.00 Tailwater Settings Tailwater (N /A) (N /A) ALLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/26/2014 14 9 MCADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #5 - WC Structure ID: Riser Structure Type: Inlet Box Number of Openings Elevation Orifice Area Orifice Coefficient Weir Length Weir Coefficient K Reverse Manning's n Kev, Charged Riser Weir Submergence Orifice H to crest 1 332.30 ft 16.0 ftz 0.600 16.00 ft 3.00 (ft ^0.5) /s 1.000 0.000 0.000 False False Return Event: 100 years Storm Event: 100 -Year .OLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/25/2014 11 B MCADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #5 - WC Structure ID: Culvert Structure Type: Culvert- Circular Number of Barrels Diameter Length Length (Computed Barrel) Slope (Computed) Outlet Control Data Manning's n Ke Kb Kr Convergence Tolerance Inlet Control Data Equation Form K M C Y TI ratio (HW /D) T2 ratio (HW /D) Slope Correction Factor Use unsubmerged inlet control 0 equation below T1 elevation. Use submerged inlet control 0 equation above T2 elevation In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 & T2... TI Elevation T2 Elevation 324.81 ft T1 Flow 325.10 ft T2 Flow 1 24.0 in 57.00 ft 57.00 ft 0.009 ft/ft 0.013 0.500 0.012 0.500 0.00 ft Form 1 0.0098 2.0000 0.0398 0.6700 1.156 1.302 -0.500 Return Event: 100 years Storm Event: 100 -Year 15.55 ft3 /S 17.77 ft3 /S .OLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/25/2014 I McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #5 - WC Structure ID: Orifice Structure Type: Orifice -Area Number of Openings Elevation Orifice Area Top Elevation Datum Elevation Orifice Coefficient 2 328.80 ft 1.0 ftz 329.30 ft 329.05 ft 0.600 Structure ID: TW Structure Type: TW Setup, DS Channel Tailwater Type Free Outfall Convergence Tolerances Maximum Iterations 30 Tailwater Tolerance 0.01 ft (Minimum) Tailwater Tolerance 0.50 ft (Maximum) Headwater Tolerance 0.01 ft (Minimum) Headwater Tolerance 0.50 ft (Maximum) Flow Tolerance (Minimum) 0.001 ft3 /s Flow Tolerance (Maximum) 10.000 ft3 /s Return Event: 100 years Storm Event: 100 -Year JLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 11/25/2014 ��9 MCADAMS Holly Springs Town Center - Phase 2 Subsection: Composite Rating Curve Return Event: 100 years Label: SWMF #5 - WC Storm Event: 100 -Year Composite Outflow Summary Water Surface Flow Tailwater Elevation Convergence Error Contributing Structures Elevation (ft3 /s) (ft) (ft) (ft) 326.50 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 326.70 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 326.90 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 327.10 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 327.30 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 327.50 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 327.70 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 327.90 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 328.10 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 328.30 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 328.50 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 328.70 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 328.80 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 328.90 0.96 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 329.10 2.89 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 329.30 4.81 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 329.50 6.46 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 329.70 7.76 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 329.90 8.88 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 330.10 9.86 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 330.30 10.76 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 330.50 11.59 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 330.70 12.36 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 330.90 13.09 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 331.10 13.78 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 331.30 14.44 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 331.50 15.07 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 331.70 15.67 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 331.90 16.25 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 332.10 16.82 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 332.30 17.36 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 332.50 22.17 (N /A) 0.00 Riser,Orifice,CuIvert 332.70 30.53 (N /A) 0.00 Riser,Orifice,CuIvert 332.90 38.90 (N /A) 0.00 Riser,Orifice,Culvert 333.10 44.78 (N /A) 0.00 Riser,Orifice,Culvert 333.30 48.45 (N /A) 0.00 Riser,Orifice,Culvert 333.50 48.97 (N /A) 0.00 Riser,Culvert (no Q: Orifice) 333.70 49.47 (N /A) 0.00 Riser,Culvert (no Q: Orifice) 333.90 49.97 (N /A) 0.00 Riser,Culvert (no Q: Orifice) 334.00 50.22 (N /A) 0.00 Riser,Culvert (no Q: Orifice) JLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 11/25/2014 wrffwrl! Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Return Event: 100 years Label: SWMF -5 (IN) Storm Event: 100 -Year Infiltration Infiltration Method (Computed) No Infiltration Initial Conditions 1.490 ac -ft Elevation (Water Surface, 328.80 ft Initial) 0.000 ac -ft Volume (Initial) 1.490 ac -ft Flow (Initial Outlet) 0.00 ft3 /S Flow (Initial Infiltration) 0.00 ft3 /S Flow (Initial, Total) 0.00 ft3 /S Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 139.05 ft3 /s Time to Peak (Flow, In) 721.000 min Flow (Peak Outlet) 34.97 ft3 /S Time to Peak (Flow, Outlet) 752.000 min Elevation (Water Surface, 332.81 ft Peak) Volume (Peak) 4.873 ac -ft Mass Balance (ac -ft) Volume (Initial) 1.490 ac -ft Volume (Total Inflow) 8.976 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 8,855 ac -ft Outflow) Volume (Retained) 1.609 ac -ft Volume (Unrouted) -0.002 ac -ft Error (Mass Balance) 0.0% ALLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 11/25/2014 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #5 KRG -11010 Anti - Flotation Block Calculations RISER ANTI- FLOTATION CALCULATION Input Data =_> Inside length of riser = 4.00 feet Inside width of riser = 4.00 feet Wall thickness of riser = 6.00 inches Base thickness of riser = 6.00 inches Base length of riser = 5.00 feet Base width of riser = 5.00 feet Inside height of Riser = 9.50 feet Concrete unit weight = 142.0 PCF OD of barrel exiting manhole = 24.00 inches Size of drain pipe (if present) = 8.0 inches Trash Rack water displacement = 52.67 CF Concrete Present in Riser Structure => Total amount of concrete: Adjust for openings: Base of Riser = 12.500 CF Riser Walls = 85.500 CF Opening for barrel = 1.571 CF Opening for drain pipe = 0.175 CF Total Concrete present, adjusted for openings = 96.255 CF Weight of concrete present = 13668 lbs Amount of water displaced by Riser Structure =_> Displacement by concrete = 96.255 CF Displacement by open air in riser = 152.000 CF Displacement by trash rack = 52.670 CF Total water displaced by riser/barrel structure = 300.925 CF Weight of water displaced = 18778 lbs J. ALLEN, PE 12/18/2013 Note: NC Products lists unit wt. of manhole concrete at 142 PCF. HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #5 KRG -11010 Anti - Flotation Block Calculations Calculate amount of concrete to be added to riser = => Safety factor to use = Must add = Concrete unit weight for use = Buoyant weight of this concrete = Buoyant, with safety factor applied = Therefore, must add = Standard based described above = Therefore, base design must have = Calculate size of base for riser assembly = => Length = Width = Thickness = Concrete Present = Check validity of base as designed = => Total Water Displaced = Total Concrete Present = Total Water Displaced = Total Concrete Present = Actual safety factor Results of design = => Base length = Base width = Base Thickness = CY of concrete total in base = Concrete unit weight in added base >= 1.15 (recommend 1.15 or higher) 7926 lbs concrete for buoyancy 142 PCF (note above observation for NCP concrete) 79.60 PCF 69.22 PCF 114.512 CF of concrete 12.500 CF of concrete 127.012 CF of concrete 8.000 feet 8.000 feet 24.0 inches 128.000 CF 416.425 CF 211.755 CF 25985 lbs 30069 lbs 1.16 OK 8.00 feet 8.00 feet 24.00 inches 4.74 CY 142 PCF OK J. ALLEN, PE 12/18/2013 DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET Project HOLLY SPRINGS TC Project No. KRG -11010 Outlet ID SWMF #5 24 in. Flow, Q10_},, 11.32 cfs Slope, S 1.00 % Pipe Diameter, D,, 24 inches Pipe Diameter, Do 2 feet Number of pipes 1 8 in. Pipe separation 0 feet Manning's n 0.013 22 in. Figure 8.06.b.1 Date 11/28/2014 Designer JCA 21T- 20 I one 6 15 I \ Lva J 10 -�� I 60114 I 5 ( `` ' 1 I i �. � �a Em► Z _ 0 0 1 2 3 4 5 6 7 8 9 10 Pipe diameter (ft) Zone from graph above = 2 Outlet pipe diameter 24 in. Length = 12.0 ft. Outlet flowrate 11.3 cfs Width = 6.0 ft. Outlet velocity 7.2 ft/sec Stone diameter = 8 in. Material = Class B Thickness = 22 in. Zone Material Diameter Thickness Length 13 Width 1 Class A 4 9 4 x D(o) x D(o) 2 Class B 8 22 6 x D(o) 3 x D(o) 3 Class I 10 22 8 x D(o) 3 x D(o) 4 Class I 10 22 8 x D(o) 3 x D(o) 5 Class II 14 27 10 x D(o) 3 x D(o) 6 Class II 14 27 10 x D(o) 3 x D(o) 7 Special study required 1. Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual 2. Outlet velocity based on full -flow velocity Rip Rap Outlet Protection Design 11/28/2014 STORMWA TER MANAGEMENT FACILITY #6 DESIGN CAL CULA TIONS HOLLY SPRINGS TC KRG -11010 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #6 J. ALLEN, PE, CFM KRG -11010 SSFxn Above NP 11/21/2014 STAGE - STORAGE FUNCTION - ABOVE NORMAL POOL j Storage vs. Stage 250000 - y = 304$2X1.113 200000 — R = 0.9996 v 150000 — m a� m `0 100000 U) 50000 — 0 1 I 1 1 1 0.00 1.00 2.00 3.00 4.00 5.00 6.00 Stage (feet) Ks = 30482 b = 1.1130 7.00 Average Incremental Accumulated Estimated Contour Contour Contour Contour Stage Contour Stage Area Area Volume Volume w/ S -S Fxn (feet) (feet) (SF) (SF) (CF) (CF) _ ..... (feet) �.. . .... 320.00 .... . _ 0.00......_26,047 _. 320.50 0.50 31,081 28564 14282 14282 0.51 322.00 2.00 35,521 33301 49952 64234 1.95 324.00 4.00 41,270 38396 76791 141025 3.96 _ 326.00 6.00 47,077 44174 a 88347 _ 229372 6.13 Storage vs. Stage 250000 - y = 304$2X1.113 200000 — R = 0.9996 v 150000 — m a� m `0 100000 U) 50000 — 0 1 I 1 1 1 0.00 1.00 2.00 3.00 4.00 5.00 6.00 Stage (feet) Ks = 30482 b = 1.1130 7.00 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #6 KRG -11010 SSFxn Main Pool STAGE - STORAGE FUNCTION - MAIN POOL J. ALLEN, PE, CFM 11/21/2014 90000 80000 - 70000 - LL 60000 - V 50000 - m rn 40000 0 w W 30000 20000 - 10000 - 0 0.00 Storage vs. Stage y = 866! R 2 = C 2.00 4.00 6.00 8.00 Stage (feet) Ks = 8669 b = 1.2140 Average Incremental Accumulated Estimated Contour Contour Contour Contour Stage Contour Stage Area Area Volume Volume w/ S -S Fxn (feet) (feet) (SF) (SF) (CF) (CF) (feet) 314.00 0.00 8,867 316.00 2.00 _ 11,396 ' 10132 20263 20263 2.01 _ 318.00 4.00 14,071 12734 25467 45730 _ _ 3.93 319.50 5.50 16,283 15177 22766 68496 5.49 320.00 6.00 19,605 17944 8972 77468 6.07 90000 80000 - 70000 - LL 60000 - V 50000 - m rn 40000 0 w W 30000 20000 - 10000 - 0 0.00 Storage vs. Stage y = 866! R 2 = C 2.00 4.00 6.00 8.00 Stage (feet) Ks = 8669 b = 1.2140 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #6 J. ALLEN, PE, CFM KRG -11010 SSFxn Forebay 11/21/2014 STAGE - STORAGE FUNCTION - FOREBAY Estimated Average Incremental Accumulated Contour Contour Contour Contour Stage Contour Stage Area Area Volume Volume w/ S -S Fxn (feet) (feet) (SF) (SF) (CF) (CF) (feet) 314.00 0.00 1,918 316.00 2.00 2,910 2414 4828 4828 2.02 318.00 4.00 4,032 3471 6942 11770 3.91 319.50 5.50 5,070 4551 6827 18597 5.49 320.00 6.00 6,441 5756 2878 21474 6.10 Storage vs. Stage Wfifif 20000 — y = 1873 R2 =0 LL 15000 - m rn m 0 10000 - .11I1I6] 0 I I I 0.00 2.00 4.00 6.00 Stage (feet) KS = 1873.8 b = 1.3483 8.00 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #6 KRG -11010 Volume Calculation TOTAL VOLUME OF FACILITY Volume of Main Pool = 77,468 cf Volume of Forebay = 21,474 cf Total Volume Below NWSE = 98,942 cf = 2.27 acre -ft Total Volume Above NWSE = 229,372 cf 5.27 acre -ft Total Volume of Facility = 328,313 cf 7.54 acre -ft FOREBAY PERCENTAGE OF PERMANENT POOL VOLUME Per NCDWQ design guidelines, the forebay volume should equal approximately 20% of the total permanent pool volume. Total Volume Below NWSE = 98,942 cf Volume of Forebay = 21,474 cf % Forebay = 21.7% AVERAGE DEPTH OF POND Total Volume Below NWSE = 98,942 cf Surface Area at NWSE = 26,047 sf Average Depth = 3.80 ft J. ALLEN, PE, CFM 11/21/2014 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #6 J. ALLEN, PE, CFM KRG -11010 Surface Area Calculation 1/28/2015 WET DETENTION BASIN SUMMARY From Stormwater Best Management Practices Manual. NCDENR: Division of Water Quality, 1999. Enter the drainage area characteristics = => Total drainage area to pond = 17.65 acres Total impervious area to pond = 10.21 acres Note The basin must be sized to treat all impervious surface runoff draining into the pond, not just the impervious surface from on -site development. Drainage area = 17.65 acres @ 57.8% impervious Estimate the surface area required at pond normal pool elevation = => Wet Detention Basins are based on an minimum average depth of = 3.80 feet (Calculated) From the DWQ BMP Handbook (1999), the required SAIDA ratio for 90% TSS Removal =_> 3.5 3.80 4.0 Lower Boundary => 50.0 2.80 2.50 Site % impervious => 57.8 3.11 2.89 2.74 Upper Boundary => 60.0 3.20 2.80 Therefore, SA/DA required = 2.89 Surface area required at normal pool = 22,203 ft = 0.51 acres Surface area provided at normal pool = 26,047 W HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #6 KRG -11010 WQV Calculation DETERMINATION OF WATER QUALITY VOLUME WQ v = (P)(R v)(A) 112 where, WQv = water quality volume (in acre -ft) Rv = 0.05 +0.009(I) where I is percent impervious cover A = area in acres P = rainfall (in inches) Input data: Total area, A = 17.65 acres Impervious area = 10.21 acres Percent impervious cover, I = 57.8 % Rainfall, P = 1.00 inches Calculated values: Rv = 0.57 WQv= 0.84 acre -ft 36560 cf. ASSOCIATED DEPTH IN POND WQv Stage /Storage Data: Ks b Zo Volume in 1" rainfall 36560 cf. 30482 1.113 320.00 36560 cu. ft Calculated values: Depth of WQv in Basin = 1.18 ft 14.13 inches Elevation = 321.18 ft J. ALLEN, PE, CFM 1/28/2015 HOLLY SPRINGS TC STORMWATER MANAGEMENT FACILITY #6 J. ALLEN, PE, CFM KRG -11010 WQVDrawdown Calculation 1/28/2015 DRAWDOWN SIPHON DESIGN By comparison, if calculated by the average head over the orifice (assuming average head is half the total depth), the result would be: Average driving head on orifice = 0.526 feet Orifice composite loss coefficient = 0.600 Cross - sectional area of siphon = 0.049 sf Q= 0.1715 cfs Drawdown Time = Volume / Flowrate / 86400 (sec /day) Drawdown Time = 2.47 days D orifice = 3 inch # orifices = 1 Ks= 30482 b = 1.1130 Cd siphon = 0.60 Normal Pool Elevation = 320.00 feet Volume @ Normal Pool = 0 cf Orifice Invert = 320.00 feet WSEL @ 1" Runoff Volume = 321.18 feet WSEL Vol. Stored Siphon Flow Avg. Flow Incr. Vol. Incr. Time (feet) (cf) (cfs) (cfs) (cf) (sec) 321.18 36560 0.242 321.07 33022 0.230 0.236 3537 14986 320.97 29524 0.217 0.224 3499 15652 320.87 26066 0.204 0.210 3457 16437 320.77 22655 0.189 0.196 3411 17384 320.66 19295 0.173 0.181 3360 18560 320.56 15994 0.156 0.164 3301 20080 320.46 12762 0.136 0.146 3233 22164 320.35 9611 0.113 0.125 3151 25300 320.25 6563 0.084 0.099 3048 30941 320.15 3656 0.038 0.061 2907 47496 Drawdown Time = 2.65 days By comparison, if calculated by the average head over the orifice (assuming average head is half the total depth), the result would be: Average driving head on orifice = 0.526 feet Orifice composite loss coefficient = 0.600 Cross - sectional area of siphon = 0.049 sf Q= 0.1715 cfs Drawdown Time = Volume / Flowrate / 86400 (sec /day) Drawdown Time = 2.47 days M" McADAMS MOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 Holly Springs Town Center - Phase 2 Subsection: Elevation -Area Volume Curve Return Event: 1 years Label: SWMF -6 Storm Event: 1 -Year Elevation Planimeter Area Al +A2 +sqr Volume Volume (Total) (ft) (ftz) (acres) (Al *A2) (ac -ft) (ac -ft) (acres) 320.00 0.0 0.610 0.000 0.000 0.000 320.50 0.0 0.724 1.999 0.333 0.333 322.00 0.0 0.822 2.317 1.159 1.492 324.00 0.0 0.957 2.667 1.778 3.270 326.00 0.0 1.051 3.011 2.007 5.277 MOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 1111 =j McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #6 Return Event: 1 years Storm Event: 1 -Year Requested Pond Water Surface Elevations Minimum (Headwater) 320.00 ft Increment (Headwater) 0.20 ft Maximum (Headwater) 326.00 ft Outlet Connectivity Structure Type Outlet ID Direction Outfall El E2 (ft) (ft) Orifice -Area Orifice Forward Culvert 322.30 326.00 Inlet Box Riser Forward Culvert 324.50 326.00 Orifice - Circular Siphon Forward Culvert 320.00 326.00 Culvert- Circular Culvert Forward TW 316.50 326.00 Tailwater Settings Tailwater (N /A) (N /A) HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 1111 McADaMs Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #6 Structure ID: Riser Structure Type: Inlet Box Number of Openings Elevation Orifice Area Orifice Coefficient Weir Length Weir Coefficient K Reverse Manning's n Kev, Charged Riser Weir Submergence Orifice H to crest 1 324.50 ft 16.0 ftz 0.600 16.00 ft 3.00 (ft ^0.5) /s 1.000 0.000 0.000 False False Return Event: 1 years Storm Event: 1 -Year HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 M11 McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #6 Structure ID: Culvert Structure Type: Culvert- Circular Number of Barrels Diameter Length Length (Computed Barrel) Slope (Computed) Outlet Control Data Manning's n Ke Kb Kr Convergence Tolerance Inlet Control Data Equation Form K M C Y T1 ratio (HW /D) T2 ratio (HW /D) Slope Correction Factor Use unsubmerged inlet control 0 equation below T1 elevation. Use submerged inlet control 0 equation above T2 elevation In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 & T2... TI Elevation T2 Elevation 318.81 ft T1 Flow 319.10 ft T2 Flow 1 24.0 in 55.00 ft 55.00 ft 0.009 ft/ft 0.013 0.500 0.012 0.500 0.00 ft Form 1 0.0098 2.0000 0.0398 0.6700 1.156 1.302 -0.500 Return Event: 1 years Storm Event: 1 -Year 15.55 ft3 /S 17.77 ft3 /S HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 1111 McADaMs Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #6 Structure ID: Siphon Structure Type: Orifice- Circular Number of Openings Elevation Orifice Diameter Orifice Coefficient Structure ID: Orifice Structure Type: Orifice -Area Number of Openings Elevation Orifice Area Top Elevation Datum Elevation Orifice Coefficient 1 320.00 ft 3.0 in 0.600 3 322.30 ft 1.0 ft2 322.80 ft 322.55 ft 0.600 Structure ID: TW Structure Type: TW Setup, DS Channel Tailwater Type Free Outfall Convergence Tolerances Maximum Iterations 30 Tailwater Tolerance 0.01 ft (Minimum) Tailwater Tolerance 0.50 ft (Maximum) Headwater Tolerance 0.01 ft (Minimum) Headwater Tolerance 0.50 ft (Maximum) Flow Tolerance (Minimum) 0.001 ft3 /s Flow Tolerance (Maximum) 10.000 ft3 /s Return Event: 1 years Storm Event: 1 -Year HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 TJ MCADAMS Subsection: Composite Rating Curve Label: SWMF #6 Composite Outflow Summary Water Surface Flow Elevation (ft3 /s) (ft) Holly Springs Town Center - Phase 2 Tailwater Elevation Convergence Error (ft) (ft) Return Event: 1 years Storm Event: 1 -Year Contributing Structures 320.00 0.00 (N /A) 0.00 (no Q: Orifice, Riser, Siphon,Culvert) 320.20 0.06 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 320.40 0.12 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 320.60 0.16 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 320.80 0.19 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 321.00 0.22 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 321.20 0.25 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 321.40 0.27 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 321.60 0.29 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 321.80 0.31 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 322.00 0.32 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 322.20 0.34 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 322.30 0.35 (N /A) 0.00 Siphon,Culvert (no Q: Orifice,Riser) 322.40 1.80 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 322.60 4.70 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 322.80 7.61 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 323.00 10.09 (N /A) 0.00 Orifice, Siphon,Culvert (no Q: Riser) 323.20 12.05 (N /A) 0.00 Orifice, Siphon,Culvert (no Q: Riser) 323.40 13.73 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 323.60 15.23 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 323.80 16.60 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 324.00 17.84 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 324.20 19.01 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 324.40 20.11 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 324.50 20.66 (N /A) 0.00 Orifice,Siphon,Culvert (no Q: Riser) 324.60 22.69 (N /A) 0.00 Orifice, Riser,Siphon,Culvert 324.80 29.96 (N /A) 0.00 Orifice, Riser,Siphon,Culvert 325.00 36.55 (N /A) 0.00 Orifice, Riser,Siphon,Culvert 325.20 40.60 (N /A) 0.00 Orifice, Riser, Siphon,Culvert 325.40 43.26 (N /A) 0.00 Orifice, Riser, Siphon,Culvert 325.60 43.89 (N /A) 0.00 Riser,Culvert (no Q: Orifice,Siphon) 325.80 44.45 (N /A) 0.00 Riser,Culvert (no Q: Orifice,Siphon) 326.00 45.01 (N /A) 0.00 Riser,Culvert (no Q: Orifice,Siphon) HOLLY SPRINGS TC KRG11010.ppc J. ALLEN, PE 1/29/2015 1 611 IN Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Return Event: 1 years Label: SWMF -6 (IN) Storm Event: 1 -Year Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions 0.000 ac -ft Elevation (Water Surface, 320.00 ft Initial) 0.000 ac -ft Volume (Initial) 0.000 ac -ft Flow (Initial Outlet) 0.00 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 0.00 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 42.85 ft3 /s Time to Peak (Flow, In) 721.000 min Flow (Peak Outlet) 0.34 ft3 /s Time to Peak (Flow, Outlet) 1,440.000 min Elevation (Water Surface, 322.22 ft Peak) Volume (Peak) 1.670 ac -ft Mass Balance (ac -ft) Volume (Initial) 0.000 ac -ft Volume (Total Inflow) 1.995 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 0.325 ac -ft Outflow) Volume (Retained) 1.670 ac -ft Volume (Unrouted) -0.001 ac -ft Error (Mass Balance) 0.0% HOLLY SPRINGS TC J. ALLEN, PE KRG 11010. ppc 1/29/2015 'J McADAMS Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Label: SWMF -6 (IN) Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions 0.000 ac -ft Elevation (Water Surface, 320.00 ft Initial) 0.000 ac -ft Volume (Initial) 0.000 ac -ft Flow (Initial Outlet) 0.00 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 0.00 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 88.15 ft3 /s Flow (Peak Outlet) 12.42 ft3 /s Elevation (Water Surface, 323.24 ft Peak) Volume (Peak) 2.566 ac -ft Mass Balance (ac -ft) Volume (Initial) 0.000 ac -ft Volume (Total Inflow) 4.783 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 3.001 ac -ft Outflow) Volume (Retained) 1.781 ac -ft Volume (Unrouted) -0.002 ac -ft Error (Mass Balance) 0.0% Time to Peak (Flow, In) Time to Peak (Flow, Outlet) Return Event: 10 years Storm Event: 10 -Year 721.000 min 754.000 min HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 'J McADAMS Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Label: SWMF -6 (IN) Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions Elevation (Water Surface, 320.00 ft Initial) 8.223 ac -ft Volume (Initial) 0.000 ac -ft Flow (Initial Outlet) 0.00 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 0.00 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 126.00 ft3 /s Flow (Peak Outlet) 29.07 ft3 /s Elevation (Water Surface, 324.78 ft Peak) Volume (Peak) 4.026 ac -ft Mass Balance (ac -ft) Volume (Initial) 0.000 ac -ft Volume (Total Inflow) 8.223 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 6.422 ac -ft Outflow) Volume (Retained) 1.799 ac -ft Volume (Unrouted) -0.002 ac -ft Error (Mass Balance) 0.0% Time to Peak (Flow, In) Time to Peak (Flow, Outlet) Return Event: 100 years Storm Event: 100 -Year 721.000 min 753.000 min HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 'J McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #6 - WC Return Event: 100 years Storm Event: 100 -Year Requested Pond Water Surface Elevations Minimum (Headwater) 320.00 ft Increment (Headwater) 0.20 ft Maximum (Headwater) 326.00 ft Outlet Connectivity Structure Type Outlet ID Direction Outfall El E2 (ft) (ft) Inlet Box Riser Forward Culvert 324.50 326.00 Orifice -Area Orifice Forward Culvert 322.30 326.00 Culvert- Circular Culvert Forward TW 316.50 326.00 Tailwater Settings Tailwater (N /A) (N /A) MOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 1 MCADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #6 - WC Structure ID: Riser Structure Type: Inlet Box Number of Openings Elevation Orifice Area Orifice Coefficient Weir Length Weir Coefficient K Reverse Manning's n Kev, Charged Riser Weir Submergence Orifice H to crest 1 324.50 ft 16.0 ftz 0.600 16.00 ft 3.00 (ft ^0.5) /s 1.000 0.000 0.000 False False Return Event: 100 years Storm Event: 100 -Year HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 TlilMcADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #6 - WC Structure ID: Culvert Structure Type: Culvert- Circular Number of Barrels Diameter Length Length (Computed Barrel) Slope (Computed) Outlet Control Data Manning's n Ke Kb Kr Convergence Tolerance Inlet Control Data Equation Form K M C Y T1 ratio (HW /D) T2 ratio (HW /D) Slope Correction Factor Use unsubmerged inlet control 0 equation below T1 elevation. Use submerged inlet control 0 equation above T2 elevation In transition zone between unsubmerged and submerged inlet control, interpolate between flows at T1 & T2... T1 Elevation T2 Elevation 318.81 ft TI Flow 319.10 ft T2 Flow 1 24.0 in 55.00 ft 55.00 ft 0.009 ft/ft 0.013 0.500 0.012 0.500 0.00 ft Form 1 0.0098 2.0000 0.0398 0.6700 1.156 1.302 -0.500 Return Event: 100 years Storm Event: 100 -Year 15.55 ft3 /s 17.77 ft3 /s HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 M" McADAMS Holly Springs Town Center - Phase 2 Subsection: Outlet Input Data Label: SWMF #6 - WC Structure ID: Orifice Structure Type: Orifice -Area Number of Openings Elevation Orifice Area Top Elevation Datum Elevation Orifice Coefficient 3 322.30 ft 1.0 ftz 322.80 ft 322.55 ft 0.600 Structure ID: TW Structure Type: TW Setup, DS Channel Tailwater Type Free Outfall Convergence Tolerances Maximum Iterations 30 Tailwater Tolerance 0.01 ft (Minimum) Tailwater Tolerance 0.50 ft (Maximum) Headwater Tolerance 0.01 ft (Minimum) Headwater Tolerance 0.50 ft (Maximum) Flow Tolerance (Minimum) 0.001 ft3 /s Flow Tolerance (Maximum) 10.000 ft3 /s Return Event: 100 years Storm Event: 100 -Year MOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 �J McADAMS Holly Springs Town Center - Phase 2 Subsection: Composite Rating Curve Label: SWMF #6 - WC Composite Outflow Summary Return Event: 100 years Storm Event: 100 -Year Water Surface Flow Tailwater Elevation Convergence Error Contributing Structures Elevation (ft3 /s) (ft) (ft) (ft) 320.00 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 320.20 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 320.40 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 320.60 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 320.80 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 321.00 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 321.20 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 321.40 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 321.60 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 321.80 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 322.00 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 322.20 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 322.30 0.00 (N /A) 0.00 (no Q: Riser,Orifice,Culvert) 322.40 1.44 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 322.60 4.33 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 322.80 7.21 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 323.00 9.68 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 323.20 11.65 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 323.40 13.31 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 323.60 14.80 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 323.80 16.14 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 324.00 17.39 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 324.20 18.54 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 324.40 19.63 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 324.50 20.16 (N /A) 0.00 Orifice,Culvert (no Q: Riser) 324.60 22.20 (N /A) 0.00 Riser,Orifice,Culvert 324.80 29.55 (N /A) 0.00 Riser,Orifice,Culvert 325.00 36.42 (N /A) 0.00 Riser,Orifice,Culvert 325.20 40.54 (N /A) 0.00 Riser,Orifice,Culvert 325.40 43.25 (N /A) 0.00 Riser,Orifice,Culvert 325.60 43.89 (N /A) 0.00 Riser,Culvert (no Q: Orifice) 325.80 44.45 (N /A) 0.00 Riser,Culvert (no Q: Orifice) 326.00 45.01 (N /A) 0.00 Riser,Culvert (no Q: Orifice) HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1/29/2015 ajUTM.T,AjjTA U_ Holly Springs Town Center - Phase 2 Subsection: Level Pool Pond Routing Summary Return Event: 100 years Label: SWMF -6 (IN) Storm Event: 100 -Year Infiltration Infiltration Method No Infiltration (Computed) Initial Conditions 1.741 ac -ft Elevation (Water Surface, 322.30 ft Initial) 0.000 ac -ft Volume (Initial) 1.741 ac -ft Flow (Initial Outlet) 0.00 ft3 /s Flow (Initial Infiltration) 0.00 ft3 /s Flow (Initial, Total) 0.00 ft3 /s Time Increment 1.000 min Inflow /Outflow Hydrograph Summary Flow (Peak In) 126.00 ft3 /s Time to Peak (Flow, In) 721.000 min Flow (Peak Outlet) 36.01 ft3 /s Time to Peak (Flow, Outlet) 751.000 min Elevation (Water Surface, 324.99 ft Peak) Volume (Peak) 4.238 ac -ft Mass Balance (ac -ft) Volume (Initial) 1.741 ac -ft Volume (Total Inflow) 8.223 ac -ft Volume (Total Infiltration) 0.000 ac -ft Volume (Total Outlet 8.143 ac -ft Outflow) Volume (Retained) 1.820 ac -ft Volume (Unrouted) -0.002 ac -ft Error (Mass Balance) 0.0% HOLLY SPRINGS TC J. ALLEN, PE KRG11010.ppc 1129/2015 FREIGHT TRAILER PARKING FACILITY STORMWATER MANAGEMENT FACILITY NWI -14000 Anti - Flotation Block Calculations - SWMF RISER ANTI - FLOTATION CALCULATION Input Data = => Safety Factor: Safety factor to use = Concrete: Riser: Openings: Concrete unit weight = Inside height of Riser = Inside length of riser = Inside width of riser = Wall thickness of riser = Base thickness of riser = Base length of riser = Base width of riser = Total Orifice Area = OD of barrel exiting manhole = Size of drain pipe (if present) = Trash Rack: Bottom Length = Bottom Width = Top Length = Top Width = Height = Trash Rack water displacement = Concrete Present in Riser Structure = => Total amount of concrete: Base of Riser = Riser Walls = Adjust for openings: Opening for Orifices = Opening for barrel = Opening for drain pipe = Total Concrete present, adjusted for openings = Weight of concrete present = 1.15 (recommend 1.15 or higher) 142.0 PCF 8.00 feet 4.00 feet 4.00 feet 6.00 inches 6.00 inches 5.00 feet 5.00 feet 3.09 SF 30.00 inches 8.0 inches 7.00 feet 7.00 feet 1.00 feet 1.00 feet 2.00 feet 38.00 CF 12.50 CF 72.00 CF 1.54 CF 2.45 CF 0.17 CF 80.327 CF 11,406 lbs Note: NC Products lists unit wt. of manhole concrete at 142 PCF. T. EDMONDS, EI 1/29/2015 FREIGHT TRAILER PARKING FACILITY STORMWATER MANAGEMENT FACILITY NWI -14000 Anti - Flotation Block Calculations - SWMF Amount of water displaced by Riser Structure => Displacement by concrete = 80.33 CF Displacement by open air in riser = 128.00 CF Displacement by trash rack = 38.00 CF Total water displaced by riser/barrel structure = 246.33 CF Weight of water displaced = 15,371 lbs Calculate size of base for riser assembly = => Length = 8.00 feet Width = 8.00 feet Thickness = 20 inches Concrete Present = 106.67 CF Check validity of base as designed = => Total Water Displaced = 340.49 CF Total Concrete Present = 174.49 CF Total Water Displaced = 21,247 lbs Total Concrete Present = 24,778 lbs Actual safety factor = 1.17 OK Results of design = => Base length = 8.00 feet Base width = 8.00 feet Base Thickness = 20.00 inches CY of concrete total in base = 3.95 CY Concrete unit weight in added base >= 106.667 PCF T. EDMONDS, EI 1/29/2015 COURTYARDS AT HOMESTEAD STORMWATER MANAGEMENT FACILITY EPC -13000 Anti - Flotation Block Calculations - SWMFA II. CALCULATION FOR RISER ANTI - FLOTATION STEEL Input Data = => Cross - Section Calculations = => Anti - Floatation Block Length = 8.0 feet Anti - Floatation Block Width = 8.0 feet Anti- Floatation Block Thickness = 20 inches ASC.i to Ate" ,te Ratio = 0.0018 (recommend 0.0018 or higher) Cross - Section Area* = 13.33 SF Minimum Steel Area Required = 0.024 SF 3.46 SI *Note: Assumes a "square "x -sec (L and Wsame) Rebar Calculations =_> 8.0 inches Vertical Clearance between Rebar Mats = 8.0 Bar Size 4 5 6 7 8 Diameter (inches) 0.500 0.625 0.750 0.875 1.000 X -Sec Area (SI) 0.196 0.307 0.442 0.601 0.785 Minimum Number of Bars 18 12 8 6 5 Spacing Calculations = => Minimum Offset of Rebar from outside of block = 8.0 inches Vertical Clearance between Rebar Mats = 8.0 inches Maximum Length of Rebar = 6.7 feet Maximum height of Rebar Mats = 0.3 feet Number of mats = 2 Bar Size 4 5 6 7 8 Number of Bars each Direction 5 3 2 2 2 Horizontal Spacing (inches O.C.) 20.00 40.00 80.00 80.00 80.00 Total Number of Bars 20 12 8 8 8 Total Cross - Sectional Area (SI) 3.93 3.68 3.53 4.81 6.28 T. EDMONDS, EI 1/29/2015 DESIGN OF RIPRAP OUTLET PROTECTION WORKSHEET Project HOLLY SPRINGS TC Project No. KRG -11010 Outlet ID SWMF #6 24 in. Flow, Qlo_yr 12.42 cfs Slope, S 0.91 % Pipe Diameter, Do 24 inches Pipe Diameter, Do 2 feet Number of pipes 1 8 in. Pipe separation 0 feet Manning's n 0.013 22 in. V d Z 0 Figure 8.06.b.1 25 - - -- t I 1 I I I 20 I 1 \ 1 15 I \ I IN \ I -- -`1- -- 10 \ \ � � � �1 '1:� ftll✓ �r 5 o 0 1 2 3 4 5 6 Pipe diameter (ft) Date 1/29/2015 Designer JCA i ( ,n 7 8 9 10 Zone from graph above = 2 Outlet pipe diameter 24 in. Length = 12.0 ft. Outlet flowrate 12.4 cfs Width = 6.0 ft. Outlet velocity 7.1 ft/sec Stone diameter = 8 in. Material = Class B Thickness = 22 in. Zone Material Diameter Thickness Length Width 1 Class A 4 9 4 x D(o) 3 x D(o) 2 Class B 8 22 6 x D(o) 3 x D(o) 3 Class I 10 22 8 x D(o) 3 x D(o) 4 Class I 10 22 8 x D(o) 3 x D(o) 5 Class H 14 27 10 x D(o) 3 x D(o) _ _ 6 Class H 14 27 10 x D(o) 3 x D(o) 7 Special study required 1. Calculations based on NY DOT method - Pages 8.06.05 through 8.06.06 in NC Erosion Control Manual 2. Outlet velocity based on full -flow velocity Rip Rap Outlet Protection Design 1/29/2015 NUTRIENT LOADING CALCULATIONS HOLLY SPRINGS TC KRG -11010 HOLLY SPRINGS TC KRG -11010 > TN- Loading Input Data Sub -basin ID To SWMF #1 To SWMF #2 To SWMF #3 To SWMF #4 To SWMF #5 To SWMF #6 I otals = _> TN- Loading Output Data PHASE 2 POST - DEVELOPMENT NITROGEN EXPORT CALCULATIONS 7. ALLEN, PE Summary of Results 2/2/2015 Phase 1 and 2 Area [acres Open Wooded Impervious Pond Total 2.16 0.00 7.49 0.40 10.05 8.58 0.00 22.71 1.89 33.18 1.74 0.00 9.45 0.00 11.19 3.08 0.19 4.60 0.47 8.34 4.54 1.01 9.27 0.52 15.34 5.68 0.00 10.21 1.42 17.31 10.09 5.73 1.02 0.00 16.84 35.87 6.93 64.75 4.70 112.25 Sub -basin ID Phase 1 and 2 Area [acresl TN -Load Before Treatment [lbs/ r % Removal TN-Load After Treatment jibs/ r] BMP Type To SWMF #1 10.05 161.86 25% _121.40 296.41 151.88 61.12 152.40 0.00 37.17 Wet Pond SW Wetland Wet Pond SW Wetland _ Wet Pond Wet Pond _ To SWMF #2 33.18 To SWMF #3 11.19 To SWMF #4 8.34 To SWMF #5 15.34 To SWMF #6 17.31 Bypass Area 16.84 494.02 40% 202.51 25% 101.87 40% 203.20 25% 0.00 25% 37.17 0% Totals = 112.25 1,200.63 TN -Load Before Treatment = 1,200.63 lbs /yr = 10.70 lbs/ac /yr Compute Max. Allowable TN- Export with an Offset Payment Max. Allowable TN- Export = 10.00 lbs/yr = 1,122.54 Ibs /ac/yr _> Compute Estimated Offset Payment Phase 1 and 2 Area = 112.25 acres Max. TN -Export w/o Offset Payment = 404.12 lbs /yr 3.60 lbs/ac /yr Computed TN -Export After Treatment = 820.38 lbs /yr 7.31 Ibs /ac /yr Phase 1 and 2 TN -Export to be Offset = 3.71 lbs /ac /yr = 12,488.04 lbs Phase 1 TN -Export (Previously Offset) = 5.45 lbs /ac /yr = 12,615.66 lbs Remaining Phase 2 Nitrogen Loading Credit = 127.62 lbs 62U.J?s J. ALLEN, PE HOLLY SPRINGS TC PHASE 2 POST- DEVELOPMENT NITROGEN EXPORT CALCULATIONS 2/2/2015 KRG -11010 Phase 1 and 2 METHOD 2: Quantifying TN Export from Residential /Industrial / Commercial Developments when Footprints of all Impervious Surfaces are shown. STEP 1: Determine the area for each type of land use and enter in Column (2). STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2). STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4). STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4). STEP 5: Determine the export coefficient for the site by dividing the total TN export from uses at the bottom of Column (4) by the total area at the bottom of Column (2). (1) _ Area _ TN coeff..:_ (4) 2 3 Type of Land Cove TN export from use [acres] (lbs /ac /yr) (lbs /yr) Permanently protected undisturbed) I 6.93 I 0.6 4.16 open space (forest, unmown meadow Permanently protected managed 40.57 I 1.2 48.69 open space (grass, landscaping, etc.) Impervious surfaces (roads, parking lots, driveways, roofs, paved storage 64.75 21.2 1372.76 areas, etc.) - TOTAL 112.25 - -- 1425.61 Total TN Export = 12.70 lbs /ae /yr % impervious = 57.7% ALLEN, PE HOLLY SPRINGS Tc PHASE 2POST- DEVELOPMENT NITROGEN EXPORT CALCULATIONS J. 2i2/2015 KRG -11010 To SWMF #1 METHOD 2: Quantifying TN Export from Residential Ilndustrial /Commercial Developments when Footprints of all Impervious Surfaces are shown. STEP 1: Determine the area for each type of land use and enter in Column (2). STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2). STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4). STEP 4: Total the TNexports for each type of land use and enter at the bottom of Column (4). STEP 5: Determine the export coefficient for the site by dividing the total TN export from uses at the bottom of Column (4) by the total area at the bottom of Column (2). ....,_Area... � TN export coeff. I TN export from 2 3 Type of Land Cover use [acres] (lbs /ac /yr) (lbs /yr) Permanently protected undisturbed 0.00 0.6 I 0.00 open space (forest, unmown meadow) Permanently protected managed I 2.56 open space (grass, landscaping, etc.) Impervious surfaces (roads, parking lots, driveways, roofs, paved storage 7.49 areas, etc.) TOTAL 10.05 1.2 3.07 21.2 1 58 .79 Total TN Export = 16.1 lbs /ac /yr % impervious = 74.5% ALLEN, PE HOLLY SPRINGS TC PHASE 2POST- DEVELOPMENT NITROGEN EXPORT CALCULATIONS J. 2/2/2015 KRG -11010 To SWMF #2 METHOD 2: Quantifying TN Export from Residential /Industrial /Commercial Developments when Footprints of all Impervious Surfaces are shown. STEP 1: Determine the area for each type of land use and enter in Column (2). STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2). STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4). STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4). STEP 5: Determine the export coefficient for the site by dividing the total TN export from uses at the bottom of Column (4) by the total area at the bottom of Column (2). Total TN Export = 14.9 lbs /ac /yr % impervious = 68.4% (4) Type of Land Cover Area TN export coeff. TN export from use [acres] (lbs /ac /yr) ( yr) lbs/ :.._ _.. . Permanently protected undisturbed 0 00 0 6 0.00 open space (forest, unmown meadow) Permanently protected managed 10.47 I 1.2 12.56 open space (grass, landscaping, etc) I Impervious surfaces (roads, parking lots, driveways, roofs, paved storage 22.71 21.2 481.45 areas, etc) TOTAL 33.18 - -- 494 02 Total TN Export = 14.9 lbs /ac /yr % impervious = 68.4% ALLEN, PE HOLLY SPRINGS Tc PHASE 2POST- DEVELOPMENT NITROGEN EXPORT CALCULATIONS J. 2/2/2015 KRG -11010 To SWMF #3 METHOD 2: Quantifying TN Export from Residential / Industrial /Commercial Developments when Footprints of all Impervious Surfaces are shown. STEP I: Determine the area for each type of land use and enter in Column (2). STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2). STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4). STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4). STEP 5: Determine the export coefficient for the site by dividing the total TN export from uses at the bottom of Column (4) by the total area at the bottom of Column (2). Type of Land Cover Permanently protected undisturbed open space (forest, unmown meadow) Permanently protected managed open space (grass, landscaping, etc.) (2) (3 ` (4) Area TN export coeff. TN export from use [acres] (lbs /ac /yr) , (lbs /yr) 0.00 0.6 0.00 I � 1.74 Impervious surfaces (roads, parking lots, driveways, roofs, paved storage 9.45 areas, etc.) TOTAL 11.19 1.2 2.09 I 21.2 200.42 _. 202.51 Total TN Export = 18.1 lbs /ac /yr % impervious = 84.5% HOLLY SPRINGS TC PHASE 2POST- DEVELOPMENT NITROGEN EXPORT CALCULATIONS 7. ALLEN, PE 2/2/2015 KRG -11010 To SWMF #4 METHOD 2: Quantifying TN Export from Residential /Industrial l Commercial Developments when Footprints of all Impervious Surfaces are shown. STEP 1: Determine the area for each type of land use and enter in Column (2). STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2). STEP 3- Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4). STEP 4: Total the TNexports for each type of land use and enter at the bottom of Column (4). STEP 5: Determine the export coefficient for the site by dividing the total TNexportfrom uses at the bottom of Column (4) by the total area at the bottom of Column (2). O (4) e Cover Type of Land Co Area TN coeff. TN ex,-.. port from use [acres] (lbs /ac /yr) (lbs /yr) .✓.... ... _ Permanently protected undisturbed 0.19 0.6 0.11 o p space en (forest, unmown meadow) Permanently protected managed 3.55 I 1.2 4.26 open space (grass, landscaping, etc) Impervious surfaces (roads, parking lots, driveways, roofs, paved storage 4.60 21.2 97.50 areas, etc) TOTAL 8.34 7. ---- -- 101.87 Total TN Export = 12.2 lbs /ac /yr % impervious = 55.2% HOLLY SPRINGS TC PHASE 2 POST - DEVELOPMENT NITROGEN EXPORT CALCULATIONS J. ALLEN, PE KRG -11010 To SWMF #S 2/2/2015 METHOD 2: Quantifying TN Export from Residential /Industrial /Commercial Developments when Footprints of all Impervious Surfaces are shown. STEP 1: Determine the area for each type of land use and enter in Column (2). STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2). STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4). STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4). STEP 5: Determine the export coefficient for the site by dividing the total TN export from uses at the bottom of Column (4) by the total area at the bottom of Column (2). (1) (2) (3) .... (4) Type of Land Cover Area TN export coeff.1 TN export from use _[acres] _. (1 bs /ac/ Yr ) _ ...... � ; .. (lbs /yr).._ _.. _ Permanently protected undisturbed .. 1.01 0.6 0.61 open space (forest, unmown meadow) Permanently protected managed 5.06 1.2 6.07 open space (grass, landscaping, etc) � Impervious surfaces (roads, parking i lots, driveways, roofs, paved storage 9.27 21.2 196.52 areas, etc.) TOTAL 15.34 I - -- 203.20 Total TN Export = 13.2 lbs /ac /yr % impervious = 60.4% PE , LEN AL HOLLY SPRINGS TC PHASE 2 POST - DEVELOPMENT NTIROGEN EXPORT CALCULATIONS J. LEN, 15 KRG -11010 To SWMF #6 METHOD 2: Quantifying TNExport from Residential /Industrial /Commercial Developments when Footprints of all Impervious Surfaces are shown. STEP 1: Determine the area for each type of land use and enter in Column (2). STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2). STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4). STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4). STEP 5: Determine the export coefficient for the site by dividing the total TN export from uses at the bottom of Column (4) by the total area at the bottom of Column (2). Total TN Export = 13.0 lbs /ac /yr % impervious = 59.0% (4) TN export from use (lbs /yr) 0.00 8.52 216.45 224.98 3 Type of Land Cover Area TN export coeff. [acres] (lbs /ac /yr) Permanently protected undisturbed 0.00 0.6 open space (forest, unmown meadow) Permanently protected managed f 7.10 ` 1.2 open space (grass, landscaping, etc) I j Impervious surfaces (roads, parking lots, driveways, roofs, paved storage 10.21 21.2 areas, etc) TOTAL `. 17.31... - -- Total TN Export = 13.0 lbs /ac /yr % impervious = 59.0% (4) TN export from use (lbs /yr) 0.00 8.52 216.45 224.98 PE , ALLEN HOLLY SPRINGS TC PHASE 2 POST - DEVELOPMENT NITROGEN EXPORT CALCULATIONS J. ALLEN, KRG -11010 Bypass METHOD 2: Quantifying TNExport from Residential /Industrial /Commercial Developments when Footprints of all Impervious Surfaces are shown. STEP 1: Determine the area for each type of land use and enter in Column (2). STEP 2: Total the areas for each type of land use and enter at the bottom of Column (2). STEP 3: Multiply the areas in Column (2) by the TN export coefficients in Column (3) and enter in Column (4). STEP 4: Total the TN exports for each type of land use and enter at the bottom of Column (4). STEP 5: Determine the export coefficient for the site by dividing the total TN export from uses at the bottom of Column (4) by the total area at the bottom of Column (2). 1) . (2) (3) ( ) Type of Land Cover Area TN export coeff. TN export from use [acres] (lbs /ac /yr) (Ib5 /yr) Permanently protected undisturbed I 573 I 0.6 3.44 open space (forest, unmown meadow ) i - Permanently protected managed 10.09 j 1.2 12.11 open space (grass, landscaping, etc.) I Impervious surfaces (roads, parking lots, driveways, roofs, paved storage 1.02 21.2 21.62 areas etc.) .. .. ,._:_ .. TOTAL- 16 84 _. -- — 37.17 Total TN Export = 2.2 lbs /ac /yr % impervious = 6.1% = 90 Y/- TSS total EFFICIENCY TSS total COMPOST TE REMOVAL TSS total = p 0% SITE HOLLY SPR�C'S -vC 90 0% T55 from Wet Pond KRG -1101 = at 4.60 ac imp TSSfromwetPond SWMP4 a° imp• a t 90.0% SWMF 5 _ g.2? 90.0% TSS fromWetPon SwMP 6 — g.68 ac imp• at 0 0%/0 T55 ac imp• at 0.51 23.12 acres Bypass P�rea = ous = Total site imps acres 22.55 area treated = 0.51 = acres envious Total site ixn pious area bypassed 2.53 — % of total impervious Total site imp % Bass s impervious a 87.8 site TSS rem °vat T otal �,ey ghted = 90 Y/- TSS total 90 0% TSS total — 90 0 °10 TSS total = p 0% TSS total J. ALLEN, PE , 20M 0 Vl O W a N N s i 00 \ NN, s I GRAPHIC SCALE 200 0 100 200 400 I I I I 1 inch = 200 ft. gm woe , � !. I I �f r I �, � �*. ®• ✓` �ppppFs , 4r. , �'�a9a\�!i sib. ° ���! �/ 4 w NZI I� i / i IF/ "o" / If / LEGEND NITROGEN TOTAL PROJECT NITROGEN ANALYSIS AREA PHASE 1 NITROGEN ANALYSIS AREA PHASE 2 NITROGEN ANALYSIS AREA MEASURED PHASE 1 IMPERVIOUS AREA MEASURED PHASE 2 IMPERVIOUS AREA MEASURED WOODED AREA AREAS EXCLUDED FROM NITROGEN CALCS BYPASS /UNTREATED IMPERVIOUS AREAS TOTAL NITROGEN ANALYSIS AREA = 177.13 acres TOTAL PHASE 1 NITROGEN ANALYSIS AREA = 76.87 acres TOTAL Q4 o PHASE � 2 NITROGEN a Q ANALYSIS Z aq� AREA a� = 35.38 acres co "1 /0 El • >'Cq U M o� z S ti in To o N ti V/ A z z w 0 O U z z W U d' W a 6 z 0 o-4 OD i w ° Cq �1 w � a r(j) O Y Z z 0 zo A V? z z z0� w O z O o x PROJECT N0. KRG -11010 FILENAME: KRG11010 —TN CALCS DESIGNED BY: JCA DRAWN BY: JCA /TAE SCALE: 1"=200' DATE: 01 -28 -15 SHEET NO. TN FINAL DRAWING - NOT RELEASED FOR CONSTRUCTION 'Wl MCADAMS H � W III 1-4 Q4 o w � a Q O Z aq� a� w� zo � w � z xo 0 Cq �1 w � a r(j) O Y Z z 0 zo A V? z z z0� w O z O o x PROJECT N0. KRG -11010 FILENAME: KRG11010 —TN CALCS DESIGNED BY: JCA DRAWN BY: JCA /TAE SCALE: 1"=200' DATE: 01 -28 -15 SHEET NO. TN FINAL DRAWING - NOT RELEASED FOR CONSTRUCTION 'Wl MCADAMS