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HomeMy WebLinkAboutSW5210303_Calcs_20210519Storm Water & Erosion Control Design Calculations May 18, 2021 Burlington Park Apartments — Phase 1 East Green St (NC Hwy 56) Franklin County, NC Prepared for: Burlington Park, LLC 9832 Koupela Dr Raleigh, NC 27614 (919)691-9596 Prepared by: Triangle Site Design, PLLC 4004 Barrett Drive, Suite 101 Raleigh, NC 27609 (919) 553-6570 License#P-0619 TRIANGLE S I T E D E S I G N TABLE OF CONTENTS OVERVIEW STORMWATER NARRATIVE FIGURES SOILS SURVEY & SOIL INFORMATION USGS TOPOGRAPHIC MAP FEMA FIRM SURFACE WATER CLASSIFICATIONS HUC NOAA POINT PRECIPITATION FREQUENCY ESTIMATES DRAINAGE AREA MAP WATER QUANTITY/QUALITY WET POND NCDEQ BMP SUPPLEMENT NUTRIENT CALCULATIONS CN VALUES PRE -DEVELOPMENT HYDROGRAPHS POST -DEVELOPMENT HYDROGRAPHS TIME VS. VOLUME (STORAGE) TIME VS. ELEVATION (STAGE) ELEVATION -VOLUME -FLOW SUMMARY POND OUTLET/STRUCTURE SUMMARY TIME OF CONCENTRATION STORM DRAINAGE SYSTEM DESIGN STORM DRAIN 100 SYSTEM EROSION CONTROL CALCULATIONS RIP -RAP APRON SKIMMER BASIN ANTI -FLOTATION CALCULATIONS TEMPORARY DIVERSION DITCH GRASS CHANNEL OVERVIEW Background This report contains the storm water and erosion control calculations for the proposed Burlington Park Apartments — Phase 1 development. The project site is located in Franklinton, NC on East Green Street. The project consists of 8.99 acres and approximately 8.77 acres will be disturbed as part of the construction of the site improvements. The current site condition consists of two single family homes creating with an existing impervious area of 10,050sf and the remaining land being wooded. The development of the site will result in an impervious area of 169,291sf (3.89 ac — 43.25% impervious). There are no existing stream or wedand features within the proposed development area. The proposed site is located within a FEMA designated flood zone shaded X per FEMA FIRM 1720186400K with an effective date of April 16 2013. Flood zones are subject to change by FEMA. The proposed stormwater management facility (wet pond) outlined in this report has been overdesigned to provide peak stormwater discharge attenuation for the proposed impervious areas of the phase 1 and future phase 2 developments. Only Phase 1 will be permitted for this submission. The site grading and storm drainage systems are designed to convey stormwater runoff from the impervious areas of the site to the wet pond. A wet pond will be used to provide peak flow attenuation for the 1-, 2-, 10-, and 50-year, 24-hour storm events and is designed to capture a drainage area of 6.62 acres with an impervious area of 3.89 acres. The maximum overall drainage area will be 8.78 acres with a maximum impervious area of 5.91 acres. The balance of the site is open space and will by-pass the proposed wet pond. The design storm for water quality is a 1" storm event. Erosion Control Erosion control measures have been designed in accordance with NCDEQ erosion control standards and regulations to minimize sediment laden runoff from exiting the site. Silt fence will be installed along the low sides of the site prior to construction. The construction entrance will be installed prior to construction commencing. Inlet protection will be installed around all existing inlets and will be utilized for the proposed curb inlets and drop inlets. A skimmer basin will be utilized to filter accumulated sediment laden runoff prior to leaving the site. Accumulated sediment within the project site will need to be removed and the pond constructed to final design conditions prior to final acceptance of the project. Soils The County Soils Survey indicates that Cecil clay loam, Helena sandy loam, Pacolet clay loam and Wedowee sandy loam soils are present on the site. Site Stabilization After final grading is completed, permanent vegetation shall be applied in accordance with the seeding requirements and landscape plan for this site. The stormwater conveyance system was analyzed using "Hydraflow Storm Sewers" and "Hydraflow Hydrographs" computer software program. FIGURES 36' 612' N 36'S-%rN Hydrologic Soil Group —Franklin County, North Carolina 3 3 Map Scale: 1:2,0901Fpdnted on A patrat (8.5" x 11') sheet. N 0 30 80 12D 18D Feet efs 0 100 200 400 600 Map prDleWm: Web Mmator Owwmardretes: WG584 Edge tics: UFM Zone 17N WGS84 36' 6 17' N 36' 5 59' N lI): Natural Resources Web Soil Survey 1/282020 6006 Conservation Service National Cooperative Soil Survey Page 1 of 4 z O a 0 z Ca G c z W 0 w J IL Q ov 0 0 O O N O N 'O z N Of 7 m 0 d N N N N m N N N G) 3 c o m a ��Upp U p L N N 7 c? 0 U? m 0 E E O CO SLN a N l0 N n LO = U N m c U@ m — O 9 N L a N 7 O l0 C E N > N L O E d N m D_ m O m E m a)m l� M cr c d `O m 0)w m N N w r w C N N E m >i N N c7 0- 2 L Z V O L E N 3 N rn o o N �o v O p m ��d00 QO L CV �� v v 3 o O N'Q3N E V w n z t and v m t `o N o m 0-Q> p > to aNi E N L cLi m N QN7 ` la d m w C U o O w 3 C co coi m o 6 p d ._ m m n E > N N 0 O m — C> C ° 7 O N N d C V U O 7 O N U N O E �. m N c d O c'm oL p N d Zv ° °' 7 N U •O jn o� w c C O v a a) m E T N L N m E C d 6.75 U L O Z D Q-0 V O N N C N N N L E N-o U m N "' E O N J O N 8-.2 C O `M i LL a 3 O +� O la E d O N l6 �Lw Ec~a d N m CY z� E L d Q U c 0i m° N N N.O. m g N N N O N O d .. .0 •C o�>,7 >. 2 �C N0 U�am L m N Up rnm !� m�o o mrn w E 2,0 OL Z O (� m N N N E C O >. E m 7 (/� ;? w � E 7 U C 7 Q y 2 m 7 0 N O� a m a m E =7 .O p8 C N m N O C C m V N O E O> j Q O mI� L� �.O c � c Q N pO� f!1 N O ` O's L N O C m N 7 p- N fo N ,Q E `-' •^ O N O G. WE t N �o C ,N N C m E a, N N 7 o O_ ., is d N L — Z _ O N w N E m S w cpi a E co U Q m H 0 Co co co U .� N N Z 7 co 'o ZCO 7 > M w O N O n U) Q m N N O > c 6 L U m 6 U L o- T c u) N O O C m = N 'D m m N E O a) O o 16 �° a Z U C)O Z to o Qf - D la � O 0 c a � c 0 0® N 0 v LL 0 N c � ° R� �a S F m N N a o m c m a o > N O N C O _0 C O '00 i' a 0 a 0)Q a m o 'OL)Q Q m C)e o z im Q a m U e o Z a m m at c c c N ® kf \j "p e �� V m N p® N • 7 N • 0 N 7 c 0 m _z MN � N ♦. C m O ZU 7 I.� Hydrologic Soil Group —Franklin County, North Carolina Hydrologic Soil Group Map unit symbol Map unit name Rating Acres in AOI Percent of AOI CeB2 Cecil clay loam, 2 to 6 B 5.5 39.4% percent slopes, moderately eroded HeB Helena sandy loam, 2 to D 1.0 7.4% 6 percent slopes PaD2 Pacolet clay loam, 10 to B 0.0 0.1 % 15 percent slopes, moderately eroded WeB Wedowee sandy loam, 2 B 4.0 28.9% to 6 percent slopes WeC Wedowee sandy loam, 6 B 3.4 24.1 % to 10 percent slopes Totals for Area of Interest 14.0 100.0% �gDa, Natural Resources Web Soil Survey 1/282020 Conservation Service National Cooperative Soil Survey Page 3 of 4 NIVW N ?f L pAK. R1AGE_RA La MITCHELL AMt - W_AU-EN AVE b 71 J v c v c d J L cu N O O _O LL LL N c 9 j l6 0 al d v L •O CL N m H l6 C O W N N y U 2 n ..1 E N ow N c C O c N :~ m v v cPv iE�R Yi0 m ac 3m pp m1c - LCEp C 0 vyL n°o Co.couv o o o¢vco m n mOr vvN .¢ o c w o Z y uW y m o ac�a1m3 co O 0 -4 OO C G O co E 0uCf 9 aTLL aa C VmaEE vr°o 0y vcm? v auE E y ° o yVaamau d c y y V c M c.2 o m 00 a ic oZ p L i o -cLL'j EEo¢1c a > y °S�°a0°v y IL mm 4m E mn0 �LL lio `w cv = o. y d o��E�a 7: o0�00� °>c y>m O Ov 0 Q U m p Z Laiva0i1) WC Wan d ILc LL p v i o w 1 yl I i n C N .- �, 0 - n N a) >` 9 mn C d 1 n n I c c 3 ._ c w 3 N E d a o m m o , �-�4 3y nE yy E� k O 1 1 n m y O d Z O my vo0cai .vc0 EL E E y v nm cd 8Ew tf ( Z n -0 O L a) y n LL wpa �y Q ox.I'E—a Lu 0-w Ii Eo'E�` m w RiO F g F-v�m �as3v c �ar�IL�m i � O O O N O O O O O O O LO O Lo N n 4 f C Q � L`' o Q : _ �o O E #- E UF U- L) E v Z p 1pin u 'a F.. } � L 4i co can ■ • 9 E • x aj �i pp Ou G If0 M V m R a1 a � N cy cy tV r j OAV I{SL4011IN r 0 U Q ♦L V Li Cl Q 7� �Q r laa B6¢1b xeo l 0 any 11GL131IN Am uanv Jcj ualiv 1/28/2020 Precipitation Frequency Data Server NOAA Atlas 14, Volume 2, Version 3 Location name: Franklinton, North Carolina, USA" Latitude: 36.10270, Longitude:-78.4354° ave'' Elevation: 402.45 fr ' 'source: ESRI Maps source: LISGS POINT PRECIPITATION FREQUENCY ESTIMATES G M. Bonnin, D Martin, B Lin, T Parzybok, M.Yekta, and D Riley NOAA, National Weather Service, Silver Spring, Maryland PF tabular I PF graphical I Maps & aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches)1 Average recurrence interval (years) Duration 1�2 F 1000 5{11in 0.375--a 442 D.437-0 514 p.498 i7 5S6 Q.556-a 657 0.614-0 728 0.658-0384 fl-68fi-D 834 fl.7278-0 879 0-761 9 0-789.0 972 7- 0.757 10a71in 0.5g9 00705 D.699.0 822 0: 980.939 0.890.61905 0.979 1 16 105-11525 1 112123J 1. 52839 1.20-31.47 1.244153 . 15{rlin 0.749--p88 0-878--11Ga 9-ii1 1�i9 1. 3333 1 24-1.47 (1.33-1.58) (1- 0--1.67 1 45--1276 1.521.65 1 567 432 30min 1 (1.03121] (1.21--31143) 1 (43---169) (1.631893} (18401 18. 2.00-2.38 (214-2.56) (2,26-2.74) (2,412.94) (2533:11) 60 min 1 28-31951 1.52-61579 1.84 016 2.1232.51 2-45190 (2.73823 2.953--53 3.7853.B4 3-46A 22 3:68-4-54 2-hr 1 0-1 79 1.79 2513 2. 8-2.60 2.54?3.04 2-96 3756 3- 3-4.01 .66-4.44 4-005488 4-d25.47 4- 9-5-98 3-hr 1 59 1 92 1- 0-2-29 2.32�81 (2- 29a.29) 3- 0 3.90) (3-624,43) 4-01 4295 (4.4305-54 (49 6-6,22) (5-42 69gD 6-hr 1.890230 2-27 27d 2737 3 37 _2763-88 3. 64 70 4-38-5.37 488-s--03 5.39--6.72 6.070706 6-668 54 12-hr (2 25 2574 2-69 3-22 3-31 3 97 3.91-4.70 4- 615 62 5.31.0 44 5- 56828 6.62 821H . 8 9644 8.30 10.fi 6-1 24-hr 1708910 3-26 3875 4-0734-69 4.71.05.42 5.57-6.43 (6.257424 (8.93 0.07 7.6338.92 8. 0410 1 9.34_131.1 11.4 2�ay 3. 4 3559) 3.784432) (4. 905-37) (5.4076.19) (6. 467130 7. 8 831 7-82 9.07] 8- 6-310:0 (8.60-11.3) (10 4-113) 3�ay 3 32 3580 4,00�4 56 d 93�5 fi4 5.87 6749 fi. 5 7 &4 a 8056 8-21 9750 9 0 10.5 101- U .8 70 9 12 9 4�ay 3 51 4.00 4 21-4 60 5- 6 5�97 5 9-0 fi.79 6.9747899 7-7876-95 8- 9 9893 9-42-111-0 10.5.12-3 11 413:5 7 day (4-084564) (4.87554 (5,92 6.73 8: 4-2769 7.868.99 (8- 3- 0.0 (9-6-141.1) 10.5-12.2 11.f8--13- . 1213 5c0 10�ay 4 �5527 5: 3-6.27 6. 4 s54 7 518.53 8.669888 9.57- 0.8 1415-12.0 11 4-13-2 1216-14- 13-6- 5.9 20�ay (5,2667.t72 (7 9.8.29 8 3-9.79 t9.79--141 0) (1112-126) (12.3- 3.9 13.4-5.2 1415-6.8 16,0 8-4 1718 9-9 30 day 78 8269 9 66 10 6-71.9 11 8? 3-2 1313-14.9 (14.4 5-2 1515-167.5 1617- 8.9 1 18 0.7 910- (19-2- 2.1 45�ay (9-94-1.0 (1116-12.9 (1313-14.7) (1416- 6-2) 1 (1613- 8-1) (1718 9.5] (1817--20-8) 11 (1929- 2-4) (21?5- 4.3) 11 (22.6-25.7 27.1 60�ay 12A- 3.2 13.9-15.4 75-8--17..3 1718 8-9 789--20-9 20�2-224 21�5-23.9 22-27 24 5-3 24.3--287.2 25-5-28.6 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not Necked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information Back to Top PF graphical https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=36.1027&Ion=-78.4354&data=depth&units=english&series=pds 1/4 .. � E& � � 3 IIDNVias. n �: $d � � �����€ `bb � �[ rmId- s1lidmWu d�� d aC N L„r FN6li -E Z {x U I�eikb Afi F-9 \ {mac nu9-C WATER QUANTITY/QUALITY SUPPLEMENT-EZ COVER PAGE FOWSLOADED PROJIrCT INFORMATION 1 Project Name Burlington Park Apartments - Phase 1 2 Project Area tacl — _ 8.99 3 Coastal Wetland Area ac _ _ _ - — 4 Surface Water Area fac - 5 Is this project Hl h or Low Density? High 6 Does this project use an off -site SCM? No COMPLIANCE WITH 02H.1003(4) 7 Width of vegetated setbacks provided (feet) ' 8 Will the vegetated setback remain vegetated? N/A 9 If BUA Is proposed in the setback does it meet NCAC 021-1_1003 4 (c-d)? No 10 Is streambank stabilization proposed on this project? No NUMBER AND TYPE OF SCMs: 11 12 Infiltration System Bioreteritton Cell 0 0 13 Wet Pond 1 14 Stormwater WeVand. 0 15 Permeable Pavement 0 16 Sand Filter D. 17 Rainwater Harvesting RWH 0 18 Green Roof 0 19 Level Spreader -Filter Strip LS-FS 0 20 Disconnected Impervious Surface (DIS) 0 21 Treatment Swale 0 _ 22 D.. Pond 0 23 IStormFlIter 0 24 Silva Cell 0 25 Bayfilter 0 26 Filterra 0 FORMS LOADED DESIGNER CERTIFICATION 27 IName and Title: Matt Lowder, PE 28 Organization-. Tr)aqgle Site Desl R PLLC 29 Street address: 4004 Barrett Dr, Suite 101 30 City, State, Zip: Phone number s - Email: Raleigh, NC 27609 31 919-553-6570 32 miowder@trianglesitedesign.com Certification Statement: I certify, under penalty of law that this Supplement-FZ form and all supporting information were prepared under my direction or supervision; that the information provided in the form is, to the best of my knowledge and belief, true, accurate, and complete; and that the engineering plans, specifications, operation and maintenance agreements and other supporting information are consistent with the information provided here_ Signature 61 Designer 51 ffIV Date DRAINAGE AREAS 1 Is this a -high density project? Yes 2 If so, number of drainage areas/SCMs 1 3 Does this project have low density areas? No 4 If so, number of low density drainage areas 0 5 Is all/part of this project subject to previous rule versions? No FORMS LOADED DRAINAGE AREA INFORMATION_ 4 Type of SCM Entire Site 1 Wet Pond Wet Pond 5 Total drainage area (sq ft) 391457 288103 6 Onsite drainage area (sq ft 391457 288103 7 Offsite drainage area (sq ft - - 8 Total BUA in project (sq ft 169291 sf 169291 sf 9 New BUA on subdivided lots (subject to permitting) (sq ft - - 10 New BUA not on subdivided lots (subject to ermittin ) (s 11 Offsite BUA (sq ft - 12 Breakdown of new BUA not on subdivided lots: Parking (sq ft 97178 sf 97178 sf Sidewalk (sq ft) 16423 sf 16423 sf Roof (sq ft 55690 sf 55690 sf Roadway s ft - - Future (sq ft Other, please specify in the comment box below (sq ft 13 New infiltrating permeable pavement on subdivided lots (sq ft 14 New infiltrating permeable pavement not on subdivided lots (sq ft - 15permitting) Existing BUA that will remain (not subject to s ft - - 16 Existing BUA that is already permitted (sq ft 17 x s ing BUA that will be removed (sq ft) 10050 sf 6098 sf 18 Percent BUA 43% 59% 19 Design storm inches 1.0 in 20 Design volume of SCM cu ft 13910 cf 21 Calculation method for design volume Simple Method ADDITIONAL INFORMATION 22 Please use this space to provide any additional information about the drainage areas : The proposed SCM has been oversized in anticipation for future phases. The maximum overall drainage area wilt be 8.78 ac with a maximum BUA of 5.91 ac. The combined Phase 1 and future Phase 2 drainage area yielded a design volume of 20,905 cf (a difference of 6995 cf). WET POND 1 Draina a area number 1 2 mum re ulred treatment volume tuft 13910 cf GENERAL IADC FROMMM 3 Is the SCM sized to treat the SW from all surfaces at build -out? Yes 4 Is the SCM located away from contaminated soils? Yes 5 What are the side slopes of the SCM H: ? 3:1 6 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No 7 Are the inlets, outlets, and receiving stream protected from erosion 10- ear storm)? Yes 8 Is there an overflow or bypass for inflow volume in excess of the design volume? Yes 9 What is the method for dewatering the SCM for maintenance? Pump referred 101 If applicable, will the SCM be cleaned out after construction? Yes 11 Does the maintenance access comply with General MDC 8 ? Yes 12 Does the drainage easement com2ly with General MDC (9)? Yes 13 If the SCM is on a single family lot, does (will?) the plat comply with General MDC 0 Q ? N/A 14 Is there an O&M Agreement that complies with General MDC (11)? Yes 15 Is there an O&M Plan that complies with General MDC (12)? Yes 16 Does the SCM follow the devicespecific MDC? Yes 17 Was the SCM designed by an NC licensedprofessional? Yes WET POND KX FROM VZH AU53 18 Sizing method used SA/DA 19 Has a stage/storage table been provided in the calculations? Yes 20 Elevation of the excavated main pool depth (bottom of sediment removal) fmsl 374.00 21 Elevation of the main pool bottom (top of sediment removal) (fmsl) 375.00 22 Elevation of the bottom of the vegetated shelf (fmsl) 379.50 23 Elevation of the Permanent pool fmsl 380.00 24 Elevation of the top of the vegetated shelf fmsl 380.50 25 Elevation of the temporary pool fmsl 381.40 26 Surface area of the main permanent pool (square feet) 10140 27 Volume of the main permanent pool (cubic feet) 35815 cf 28 1 Avers a depth of the main pool (feet) 4.03 ft 29 1 Average depth equation used E uation 3 30 If using equation 3, main pool Rerimeter feet 458.0 ft 31 If using equation 3, width of submar ed veg. shelf feat 3.0 ft 32 Volume of the foreba (cubic feet) 6484 cf 33 Is this 15-20% of the volume in the mainpool? Yes 34 Clean -out depth for foreba (inches) 36 in 35 Design volume of SCM cu ft 13910 cf 36 Is the outlet an orifice or a weir? Orifice 37 If orifice, orifice diameter inches 2.25 in 38 If weir, weir height inches 39 If weir, weir length (inches) 40 Drawdown time for the temporary pool (days) 2.18 41 Are the inlet(s) and outlet located in a manner that avoids short- circuiting? Yes 42 jAre berms or baffles provided to improve the flowpath? Yes 43 Depth of forebay at entrance (inches) 48 in 44 Depth of forebay at exit (inches) 42 in 45 Does water flow out of the forebay in a non -erosive manner? Yes 46 Width of the vegetated shelf (feet 6 ft 47 Slope of vegetated shelf (H:V) 6:1 48 Does the orifice drawdown from below the top surface of the permanentpool? Yes 49 Does the pond minimize impacts to the receiving channel from the 1 r 24-hr storm? Yes 50 Are fountains proposed? (If Y, please provide documentation that MDC 9 is met. No 51 Is a trash rack or other device provided to protect the outlet system? Yes 52 Are the dam and embankment planted in non -clumping turf grass? Yes 53 Species of turf that will be used on the dam and embankment Hybrid Bermuda 54 Hasa planting plan been provided for the vegetated shelf? Yes ADDITIONAL INFORf AAT[ON 55 Please use this space to provide any additional information about the wet pond(s): Wet Pond 1 11:18 AM 5/11/2021 Tar -Pamlico Stormwater Rule 15A NCAC 2B .0258 Last Modified 5/11/2021 Piedmont of the Tar -Pamlico River Basin: Includes Oxford, Henderson. Rocky Mount and Tarboro as well as Franklin, Nash and Edgecome Counties Total Nitrogen and Total Phosphorus Loading Calculation Worksheet (Automated) Project Name: Burlington Parks - Phase 1 Date: 511112021 By: Rlatthew Lowder, PE - Triangle Site Design Checked By: Directions (same for pre -development and post -development tables): > Enter the acres of each type of land cover in the green boxes. The spreadsheet will calculate all of the values in light blue. > Compare total areas of development in pre- and post- tables for consistency (bottom of column (2)), and also for consistency with the site plans. If all of these values are not the same, there is an error that must be corrected. > Unless drainage onto the development from offsite is diverted around or through the site, offsite catchment area draining in must be included in the acreage values and treated. Pre -development: (1) (2) (3) (4) (5) (6) (7) Type of Land Cover Area S.M. Formula Average EMC Column Average EMC Column acres 0.46 + 8.31 of TN m 2 * 3 4 of TP (m ) 2) *(3) * 6) Transportation impervious 0.: _ 0.67 2.60 0.40 0.19 0.03 Roof impervious 0.67 1.95 0.00 0.11 0.00 Managed pervious (lawn/landscaped) ii '75 0.67 1.42 0.72 0.28 0.14 Managed pervious (cropland) 0.67 4.23 0.00 1.23 0.00 Managed pervious (pasture) 0.67 2.04 0.00 0.62 0.00 Wooded pervious 0.67 0.94 5.06 0.14 0.75 Fraction Impervious (1) = 0.03 TN Loading 6.18 TP Loading 0.92 (lb/yr) _ (Ib/yr) _ Total Area of Development = 8.99 TN Exp. Coeff. 0.69 TP Exp. Coeff. 0.10 (lb/ac/yr) _ (lb/ac/yr) _ Post -development: (1) (2) (3) (4) (5) (6) (7) Type of Land Cover Area S.M. Formula Average EMC Column Average EMC Column (acres) (0.46 + 8.3I) of TN m ) 2) * 3 * (4) of TP (mg/L) (2) * (3) * 6 Transportation impervious 2.61 4.06 2.60 27.52 0.19 2.01 Roof impervious 1.28 4.06 1.95 10.12 0.11 0.57 Managed pervious 5.111E 4.06 1.42 29.37 0.28 5.79 Wooded pervious 0.00 4.06 0.95 0.00 0.14 0.00 Fraction Impervious (1) = 0.43 TN Loading 67.02 TP Loading 8.37 (lb/yr) _ (lb/yr) _ Total Area of Development = 8.99 TN Exp. Coeff. 7.45 TP Exp. Coeff; 0.93 (lb/ac/yr) _ (lb/ac/yr) = Note: The nutrient loading goals are 4.0 Ib/ac/yr for TN and 0.4 lb/ac/yr for TP. If the post -development nutrient loading is below these levels, then no BMP is necessary. Otherwise, the next worksheet calculates post -development TN and TP loadings after BMPs are installed. Tar -Pamlico Stormwater Rule 15A NCAC 2B .0258 Last Modified 5/23/03 Piedmont of the Tar -Pamlico River Basin: Includes Oxford, Henderson. Rocky Mount and Tarboro as well as Franklin, Nash and RdIzecome Counties BMP Removal Calculation Worksheet (Automated) Project Name: Burlington Parks - Phase I Date: 511112021 By: ;11anhew Lowder, PE - Triangle Site Design Checked By: Directions: -• It may be advantageous to split the development into separate catchments to be handled by separate BMPs. The tables below allow the development to be split into as many as three catchnnents, and can be copied for greater than three. NOTE: Unless runoffflowing onLo the development from offsite is routed separately around or through the site, the offsite catchment area draining in must be included in the acreage values ofthe appropriate land use(s) and treated. Above each table: Enter the catchment acreage in the top green blank. Based on a comparison of the post -development TN and TP export coefficients you calculated above to the rule requirements of 4.0 lb/ac/)T TN and 0.4 lb/ac/yr TP, select BMP(s) from the list for treating the catchment runoff. Enter the chosen BMP(s) nutrient removal rates in the green blanks. If more than one BMP is to be used in series, the combined removal rates will be calculated automatically in the blue blanks. > Catchment Tables: Enter the acres of each type of land cover in the green boxes. The spreadsheet will calculate all of the light blue boxes. NOTE: Compare the Total Catchment Acreage for the Development (final table) to the value you established in the pre-BMP worksheet tables, and also to the site plans, for roasiswnrcy. All ofthese values need to be the same TN TP Design Standard BMP Wet Retention Pond 25 40 NC BMP Manual Nutrient StarrmvaterWetland 40 35 NC BMP Manual Removal Sand Filter 35 45 NC BMP Manual Rates Blaretentlan 35 45 NC BMP Manual Grasis Swale 20 20 NC BMP Manual Vegetated Filter Strip w/ 20 35 NC BMP Manual Level Spreader Dry Detention 10 10 NC BMP Manual Catchment 1: Total acreage ofcatchment I = R,9.J ac First BMP's TN removal rate = 2'3 46 First BMP's TP removal rate = ° o Second BMP's TN removal rate = % Second BMP's TP rentova] rate = % Third BMP's TN removal rate = ° o Tltird BMP's TP removal rate = % TOTAL TN REMOVAL RATE = 25 90 TOTAL TP REMOVAL RATE (1) (2) (3) (4) (5) [tr] (7) Type (of Land Cover Catchment 8,M. Formula Average HMC Column Average E.MC Column Acura a 0.46+8.31 ofTN m L 2 3 4 of TP nr /l. 2 3 6 Transportation impervious 4.06 2.60 27.52 0.19 2.01 14o1)fiunprnious OR 4.06 1.95 10.12 0.11 0.57 NIttnaecd penious 55 4.06 1.42 26.20 0.28 5.17 Wooded pervious IIJ10 4.06 0.94 0.00 0.14 0.00 Area taken up by BMP u'=5 4.06 1.95 4.35 0.11 0.25 Fraction Unper[iuus (1)= 0.43 Pre-BMP TN 68.20 Pre-1IMP TP 7.99 Load (lb/yr) = Load (lblyr) _ TotaI Area of Development - 8.99 PrelicA 7.59 t�rr 8MP t t 0.89 )R P.lpbrt [tbilri`r= t'.EpOrl [Lb�LC�Vt'] _ Post-BMP TN 51.15 Port-RMP TP 4.80 Load (lb/yr)= hone] (IITI►r)� F7- Past-BMP TN 5.69 Post-BMP TP 0.53 rspurl 0blady7)= Export (Ib/adyr) = Tar -Pamlico Stormwater Rule 15A NCAC 2B .0258 Last Modified 5/23/03 Catchment 2: Total acreage of catchment 2 = First BMP's TN removal rate =Mac 90 First BMP's TP removal rate = % Second BMP's TN removal rate =% Second BMP's TP removalrate = % Hurd BMP's TN removal rate =% Third BMP's TP removal rate = % TOTAL TN REMOVAL RATE = 0 % TOTAL TP REMOVAL RATE = tl 910 (1) (2) (3) (4) (5) 1(6) (71 Type of Land Cover Catchment 4.NI. Formula Average EN -IC Column Average EMC Cuhn:ur Arreo c (0.48 + 8.3I of TN (m IL 2 • (3)• 4 of'fY ( Z 3 6 Transportation impervious 2.60 0.19 Roof imperious 1.95 0.11 Managed pervious 1.42 0.28 "'coded pervious 0.94 0.14 Area taken up by RMP 1.95 0.11 Fraction .Impervious (I) = Pre-BMP TN Pre-BN-1P TP Load (lbhr)= IA)ad (lblyr)- Total Area of Develupmeat = Pet BNIP TIN Eslxwrt Pre-Ii:IIP TP Exp orl [ihlAclyr} _ {Ihluclyr} = Post-BMP TN Post-BMF TP Load 0blyry= l oad(Iblyr)= -T Plnl-B MP T1� Parr-UT61 P TI' F.zpnrl {ILlnclyt') - Espy! Rbinclyr) _ Catchment 3: Total acreage of catchment 3 = First BMP's TN removal rate =Mac % First BMP's TP removal rate = % Second BMP's TN removal rate =90 Second BMP's TP removal rate = 90Third BMP's TN removal rate =% Third BMP's TP removal rate = % TOTAL TN REMOVAL RATE = 0 % TOTAL TP REMOVAL RATE _ - 0 % (] (2) (3) (i (5) (6) (7) Type or Land Cover C•atchmpnf SAI. Formula Average ENIC Column Average ENIC' Column Aerea r 0.46 + 8.3I of TN rn (L 2 3 4 of TY m (2),(3),(6) FrausPnrt:rtiun impen imts 2.60 0.19 Roof impervious 1.95 0.11 Managed pervious 1.42 0.28 Wooded Pcn-lous 0.94 0.14 Area taken up by BNIP 1.95 0.11 Fraction impemious (1) = Pre-BNIP TN Pre-BMP TP Loud (Iblyr) = Lvad (lblyr) _ Total Area of Development Pre BRiP TN EMmyt Pre-BMP TP Exparl (Ihlmelyr) _ (WID lrr) - Post -Bali' T?7 Pust-131UP TI' Load (Iblyr) = Load (Ibly r) _ phit-Ii IIl P TN Purl-B Rt 1' 1P Expert (Iblaclyr) = Expvrl (Iblydtr) - Tar -Pamlico Stormwater Rule 15A NCAC 28.0258 Last Modified 5/23/03 Average rifNutrient Laatdings frufn the Catchments: C'atchinent Pest-BNIP Post-13114P Acmnee TN Loading TV Lauding tlhlaclyr) (Iblac/yr) t'atciuitetit ] 8.99 1 5.69 1 0.53 1 Catchment 2 1 0.00 1 0.00 1 0.00 1 I C:atclunent 3 1 0.00 1 0.00 1 0.00 1 ITOTAL FOR 8.99 I 5.69 I 0.53 DEVELOPMENT i Note: The nutrient loading goals are 4.0 lb/ae/yr for TN and 0.4 lb/ac/yr for TP. If the post -development nutrient loading is below these levels, then the BMPs planned are adequate. Otherwise, additional BMPs and/or modifications in development plans are required. Triangle Site Design, PLLC Curve Number Calculation (CN) Pre -Developed Conditions Drainage Area (acres, 6.62 Existing Soil Groups: Sod Group Mai) Symbol Soil Description Acres Percent of DA B CeB2 Cicl Clay Loam 4.00 60% B PaD2 Pacolet Clay Loam 0.00 0% B WeB Wedowee Sandy Loam 0.92 14% B WeC Wedowee Sandy Loam 1.50 23% D HeB Helena Sandy Loam 0.20 3% Proposed Land Uses: Land Use Description Existing Soil Group Acres Curve # Weighled CN Wooded - Good Stand B 5.53 60 50A Open Space - Good Condiditon B 0.75 77 8.7 Impervious B 0.14 98 2.1 Wooded - Good Stand D 0.20 77 2.3 Cumulative Curve # = 63.2 Triangle Site Design, PLLC Curve Number Calculation (CN) Post -Developed Conditions (Wet Pond) Drainage Area (acresZ 6.62 Existing soil Groups: Soil Grow Map Symbol Soil Description Acres Percent of DA B CeB2 Cicl Clay Loam 4.00 60% B PaD2 Pacolet Clay Loam 0.00 0% B WeB Wedowee Sandy Loam 0.92 14% B WeC Wedowee Sandy Loam 1.50 23% D HeB Helena Sandy Loam 0.20 3% Proposed Land Uses., Land Use Description Existing Soil Groin Acres Curve # Weighted CN Wooded - Good Stand B 0 77 0.0 Open Space - Good Condition B 2.73 68 28.0 Impervious B 3.69 98 54.6 Wooded - Good Stand D 0 77 0.0 Impervious D 0.20 98 3.0 Cumulative Curve # = 85.6 Proposed Wet Pond Project Information Project Name: Burlington Park Apartments Project #: Designed by: CEP Date: 5/11/2021 Revised by: Date: Checked by: Date: Site Information Sub Area Location: Drainage To Proposed Wet Pond Drainage Area (DA) = 6.62 Acres 288103 sf Impervious Area (IA) = 3.89 Acres 169291 sf Percent Impervious (1) = % 58.76 % Required Surface Area Permament Pool Depth: 4.03 ft non -Coastal County SA/DA = 1.73 Min Req'd Surface Area = 4,989 sf (at Permanent Pool) Required WQv Storage Volume Design Storm = 1 inch non -Coastal County Determine Rv Value = 0.05 + .009 (1) = 0.579 in/in Storage Volume Required = 13,910 cf (above Permanent Pool) Elevations Top of Pond Elevation = 385.00 ft Temporary Pool Elevation = 381.40 ft Permanent Pool Elevation = 380.00 ft Shelf Begining Elevation = 38M0 ft Forebay Weir = 379.00 ft Shelf Ending Elevation = 379.50 ft Bottom Elevation = 375.00 ft Permanent Pool Area Area @ Top of Permanent Pool = 10,140 sf Volume of Temporary Storage = 21,454 cf Is Permenant Pool Surface Area Sufficient (yes/no)? ( 10140 > 4989 ) sf Volume of Storage for Design Storm = 21,454 Yes ( 21454 > 13910 ) cf Incremental Drawdown Time STORMWATER POND INCREMENTAL DRAWDOWN METHOD -Water Quality Volume Project Information Project Nar Burlington Park Apartments Project #: asigned by: CEP Date: 5/11/2021 iecked by: Date: Water Quality Orifice * Incremental Determination of Water Quality Volume Drawdown Time Zone 3 I Q3 = 0.0437 Cp * D2 (Z-D/24-Ei)^("2) Zone 2 f� Q2 = 0.372 CD * D*(Z-Ei)^(3n) Zone 1 Q' = 0 Orifice Diameter (D) = 2.25 in Cd = 0.6 Ei = 380 Orifice Inv - Zonal Range = 0.00 to 380 Zone 2 Range = 380 to 380.1 Zone 3 Range = 380.1 to 381 Incremental Drawdown Method Countour Contour Area Incremental Volume Stage, Z Zone Q Drawdown Time sq ft cu ft ft cfs min 380.00 13,255 0 0.00 2.00 0.000 -- 380.50 15000 7,064 0.50 3.00 0.085 1.392 381.00 16080 7,770 0.50 3.00 0.126 1,025 381.40 17020 6.620 0.40 3.00 0.152 727 Total 1 21,454 -- -- -- 3,144 Drawdown Time = Incremental Volume / Q / 60sec/min Summary Total Volume = 21,454 cf Total Time = 3,144 min Total Time = 2.18 days 5/11/2021 Prop Wet Pond- new design-Franklinton_Phase 1 1 of 1 Project: Pond #1 Date: 5/11/2021 Main -Pond Contours -Volumes Elevation Main -Pond Incremental Vol. Accumulated Vol. Description 380 10,140 4,734 35,815 A2 (Perm -Pool) 379.5 8,795 4,289 31,081 Al (Bottom_Shelf) 379 8,360 7,930 26,793 378 7,500 7,088 18,863 377 6,675 6,278 11,775 376 5,880 5,498 5,498 375 5,115 0 0 A3 (Bottom -Pond) Forebay Contours -Volumes Elevation FB1 FB2 FB3 Total -Areas Incremental Vol. Accumulated Vol. 380 2,980 2,980 1,428 6,484 379.5 2,730 2,730 1,304 5,056 379 2,485 2,485 2,250 3,753 378 2,015 2,015 1,503 1,503 377 990 990 0 0 Forebay Volume 18.1% *Between 15% & 20% Average Depth (Option 1) 3.53 *At least 3' average depth Average Depth Calculation (Option 2) Vpp 35,815 permeter of shelf 458 width of shelf 3 Al (Bottom -Shelf): 8,795 Average Depth = 4.03 Project Information Site Information Proposed Wet Pond #1 Project Name: Burlington Park Apartments Project #: Designed by: CEP Date: 5/11/2021 Revised by: Date: Checked by: Date: Sub Area Location: Drainage to Proposed Pond Drainage Area (DA) = 6.62 Acres Impervious Area (IA) = 3.89 Acres Percent Impervious (1) = 58.76 % (Drainage Area) Orifice Sizing Orifice Size = 2.25 Drawdown Time = 2.18 less than 5 days (yes/no) ? yes greater than 2 day (yes/no) ? yes Anti -Flotation Device 4' x 4' Outlet Structure in (Diameter) days (Incremental Draw Down Method) Area: 16.0 sf Volume: 160.0 cf Weight: 9984 Ibs Factor of Safety 1.20 WT Req'd of Anti -Flotation Device: 11,981 Ibs Volume of Concrete Req'd: 79.9 cf (Water Displaced - Top of Pond to Bottom of Pond) (Unit WT of Concrete = 150 pcf) Volume Provided: 117.5 cf (4'x4' riser x 5' = 80cf, 5'x5' footing x 1.5'=37.5cf) IMPERVIOUS AREA SUMMARY ON -SITE AREA (PHASE 1) = 391,457 SF (8.99 AC) BUILDINGS 55,690 SF 128 ACRE(S) 1423 % AREA PAVEMENT 97,178 SF 223 ACRE(S) 24.82 % AREA SIDEWALK 16,423 SF 038 ACRES 420 °k OF AREA TOTAL IMPERVIOUS AREA 169291 SF 3.89 ACRE(S) 43.25 °k OF AREA GREEN/OPEN SPACE 222,166 SF 5.10 ACRE(S) 5675 °h OF AREA EXIST IMPERVIOUS AREA (TO BE DEMO): 10,050 SF 0.23 ACRE(S) 2.57 % OF AREA INCREASE IN IMPERVIOUS AREA: 159,241 SF 3.66 ACRE(S) R� I / ■ STAGEISTORAGE TABLE STAGE ELEVATION CONTOUR INCREMENTAL TOTAL (FT) (FT) AREA (SF) STORAGE (CF) STORAGE (CF) 0.0 380.0 13255 0 0 0.5 380.5 15000 7064 7064 1.0 381.0 16080 7770 14834 1.4 381.4 17020 6620 21454 (WQv) 2.0 382.0 18140 10548 32002 3.0 383.0 19975 19058 51059 4.0 384.0 21870 20923 71982 5.0 385.0 23815 22843 94824 STORMWATER MANAGEMENT DESIGN WET DETENTION POND -PHASE 1 RIVER BASIN: TAR-PAMLICO RECEIVING STREAM: FRANKLINTON BRANCH STREAM INDEX: 28-29.4 CLASSIFICAITON: C; NSW HUC: 03020101 POND DESIGN SUMMARY DRAINAGE AREA TO POND: 6.62 ACRES SITE IMPERVIOUS AREA TO POND: 3.89 ACRES OFF -SITE DESIGN IMPERVIOUS AREA TO POND: 0.0 ACRES TOTAL DESIGN IMPERVIOUS AREA TO POND, 3.89 ACRES PRE -DEVELOPED POST -DEVELOPED POST -DEVELOPED TO POND TO POND THROUGH POND DRAINAGE AREA: 6.62 AC 6.62 AC CURVE NUMBER: 63.2 85.6 TIME OF CONCENTRATION: 18.1 MIN 5 MIN 1" STORM EVENT: 0.844 CFS 0.054 CFS 1-YEAR STORM EVENT: 1.982 CFS 17.14 CFS 0.167 CFS YEAR STORM EVENT: 4.039 CFS 22.64 CFS 0.193 CFS 10-YEAR STORM EVENT: 11.30 CFS 37.69 CFS 2.014 CFS 50-YEAR STORM EVENT: 20.49 CFS 53.73 CFS 11.14 CFS m g cd 0 FS a �[ Joe 0 oo� K -� cn cn LU ;m co [ C> o J_ M: C> d Z s [ [ U fIi - L 70P0 nP`B PERM. POND ELEV, 380.0 it W ft NOT 5HUVVN FOR U ARITY F ACCESS) OUTLET CONTROL STRUCTURE - INCREMENTAL WEIR 4" PVC SCREW CAP FOR CLEANING ACCESS 1T MIN. 17 MIN. 4'x4' PVC' 4 DIA. HOLE DRILLEI INTO BOTTOM CAP nand nT j/ IRr PVC DRAIN OUTLET a m s U Y U Pond Report Hydraflow Hydrographs Extension forAutoCADO Civil 3DO 2009 byAutodesk, Inc. v6.066 Tuesday, May 18, 2021 Pond No. 1 - Wet Pond Pond Data Contours - User -defined contour areas Average end area method used for volume calculation. Begining Elevation = 380.00 ft Stage / Storage Table Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cult) Total storage (cuft) 0.00 380.00 13,255 0 0 0.50 380.50 15,000 7,064 7,064 1.00 381.00 16,080 7,770 14,834 1.40 381.40 17,020 6,620 21,454 2.00 382.00 18,140 10,548 32,002 3.00 383.00 19,975 19,058 51,059 4.00 384.00 21,870 20,923 71,982 5.00 385.00 23,815 22,843 94,824 Culvert / Orifice Structures [A] [B] [C] [PrfRSr] Rise (in) = 18.00 225 Inactive Inactive Span (in) = 18.00 2.25 0.00 0.00 No. Barrels = 1 1 0 0 Invert El. (ft) = 380.00 380.00 0.00 0.00 Length (ft) = 41.00 0.50 0.00 0.00 Slope (%) = 2.44 1.00 0.00 n/a N-Value = .013 .013 .013 n/a Orifice Coeff. = 0.60 0.60 0.60 0.60 Multistage = n/a Yes No No Stage (ft) 5.00 4.00 3.00 2.00 m 0.00 0.00 4.00 Total Q Weir Structures [A] [B] [C] [D] Crest Len (ft) = 4.00 10.00 Inactive Inactive Crest El. (ft) = 382.60 384.00 0.00 000 Weir Coeff. = 3.33 2.60 3.33 333 Weir Type = Rect Broad --- --- Multistage = Yes No No No Exfil.(in/hr) = 0.000 (by Contour) TW Elev. (ft) = 0.00 Note: CulverttOrifice outflows are analyzed under inlet (ic) and outlet (oc) control Weir risers checked for orifice conditions (ic) and submergence (s) 8.00 Stage / Discharge Elev (ft) 385.00 38400 383.00 382.00 381.00 380.00 12.00 16.00 20.00 24.00 28.00 32.00 36.00 40.00 44.00 Discharge (cfs) Hydrograph Summary Re pCOaflow Hydrographs Extension for AutoCADO Civil 3DO 2009 by Autodesk, Inc. v6.066 Hyd. No. Fran Hydrograph type (origin) SCS Runoff Peak flow (cfs) Time interval (min) Time to peak (min) Hyd. volume (cult) Inflow hyd(s) Maximum elevation (ft) Total i strge used (cuft) -- Hydrograph description Pre -Developed -Overall Site 1.982 2 728 9,478 — SCS Runoff 17.14 2 716 34,681 ---- --- -- Post Developed to Pond Reservoir 0.167 2 1440 32,809 2 381.74 27,505 Post Through Pond SCS Runoff 0.844 2 150 4,227 - -- 1.0 Post -Developed to Pond Reservoir 0.054 2 366 3,997 5 1 Year 380.27 3,755 1.0inPost Through Pond klinton_pond_Phase 1.gpw Return Period: Tuesday, May 18, 2021 Hydrograph Report 2 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Hyd. No. 1 Pre -Developed -Overall Site Hydrograph type = SCS Runoff Storm frequency = 1 yrs Time interval 2 min Drainage area = 6.620 ac Basin Slope = 0.0 % Tc method = USER Total precip. = 2.89 in Storm duration = 24 hrs 1.00 Tuesday, May 18, 2021 Peak discharge = 1.982 cfs Time to peak = 728 min Hyd. volume = 9,478 cuft Curve number = 63.2 Hydraulic length = 0 ft Time of conc. (Tc) = 18.10 min Distribution = Type II Shape factor = 484 Pre -Developed -Overall Site Hyd. No. 1 -- 1 Year 120 240 360 480 600 720 840 960 Hyd No. 1 Q (cfs) 2.00 1.00 0.00 1080 1200 1320 1440 1560 Time (min) Hydrograph Report 3 Hydraflow Hydrographs Extension for AutoCADO Civil 3DO 2009 by Autodesk, Inc v6.066 Hyd. No. 2 Post Developed to Pond Hydrograph type = SCS Runoff Storm frequency = 1 yrs Time interval = 2 min Drainage area = 6.620 ac Basin Slope = 0.0 % Tc method = USER Total precip. = 2.89 in Storm duration = 24 hrs 15.00 12.00 MS 3.00 Tuesday, May 18, 2021 Peak discharge = 17.14 cfs Time to peak - 716 min Hyd. volume = 34,681 cuft Curve number = 85.6 Hydraulic length = 0 ft Time of conc. (Tc) = 5.00 min Distribution = Type II Shape factor = 484 Post Developed to Pond Hyd. No. 2 -- 1 Year 120 240 360 480 600 720 Hyd No. 2 Q (cfs) 18.00 15.00 12.00 . We 3.00 0.00 840 960 1080 1200 1320 1440 Time (min) 4 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Tuesday, May 18, 2021 Hyd. No. 3 Post Through Pond Hydrograph type = Reservoir Peak discharge = 0.167 cfs Storm frequency = 1 yrs Time to peak = 1440 min Time interval = 2 min Hyd. volume = 32,809 cuft Inflow hyd. No. = 2 - Post Developed to Pond Max. Elevation = 381.74 ft Reservoir name = Wet Pond Max. Storage = 27,505 cuft Storage Indication method used Q (cfs) 18.00 15.00 12.00 •M M 3.00 W Post Through Pond Hyd. No. 3 -- 1 Year 600 1200 1800 2400 3000 3600 4200 4800 5400 Hyd No. 3 Hyd No. 2 ® Total storage used = 27,505 cuft Q (cfs) 18.00 15.00 12.00 M we] 3.00 0.00 6000 Time (min) Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Tuesday, May 18, 2021 Hyd. No. 5 1.0 Post -Developed to Pond Hydrograph type = SCS Runoff Peak discharge = 0.844 cfs Storm frequency = 1 yrs Time to peak = 150 min Time interval = 2 min Hyd. volume = 4,227 cuft Drainage area = 6.620 ac Curve number = 85.6 Basin Slope - 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 5.00 min Total precip. = 1.00 in Distribution = SCS 6-Hr Storm duration = 6.00 hrs Shape factor = 484 Q (cfs) 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 0 1.0 Post -Developed to Pond Hyd. No. 5 -- 1 Year 60 120 180 240 300 360 Hyd No. 5 Q (Cfs) 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 420 Time (min) VA Hydrograph Report Hydraflow Hydrographs Extension forAutoCAD® Civil 3D®2009 byAutodesk, Inc. v6.066 Tuesday, May 18, 2021 Hyd. No. 6 1.0inPost Through Pond Hydrograph type = Reservoir Peak discharge = 0.054 cfs Storm frequency = 1 yrs Time to peak = 366 min Time interval = 2 min Hyd. volume = 3,997 cuft Inflow hyd. No. = 5 - 1.0 Post -Developed to Pond Max. Elevation = 380.27 ft Reservoir name = Wet Pond Max. Storage = 3,755 cuft Storage Indication method used. Q (cfs) 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 0 600 Hyd No. 6 1.0inPost Through Pond Hyd. No. 6 -- 1 Year Q (cfs) 1.00 0.90 0.80 0.70 0.60 0.50 0.40 0.30 0.20 0.10 0.00 1200 1800 2400 3000 3600 4200 4800 5400 6000 Time (min) Hyd No. 5 ® Total storage used = 3,755 cult Hydrograph Summary Reper —Ffydraflow Hydrographs Extension for AutoCADO Civil 3D® 2009 by Autodesk, Inc v6.066 Hyd. No. Hydrograph type (origin) Peak flow (cfs) Time interval (min) Time to peak (min) Hyd. volume (cult) Inflow hyd(s) - Maximum elevation (ft) -- Total strge used (cuft) Hydrograph description Pre -Developed -Overall Site 1 SCS Runoff 4.039 2 726 15,831 - — 2 SCS Runoff 22.64 2 716 46,133 ------ --- ------ Post Developed to Pond 3 Reservoir 0.193 2 1440 41,817 2 382.30 37,711 Post Through Pond 5 SCS Runoff 0.000 2 n/a 0 - - ------ 1.0 Post -Developed to Pond 6 Reservoir 0.000 2 1.gpw n/a 0 5 380.00 0.000 Tuesday, May 1.0inPost Through Pond Franklinton_pond_Phase Return Period: 2 Year 18, 2021 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Hyd. No. 1 Pre -Developed -Overall Site Hydrograph type = SCS Runoff Storm frequency = 2 yrs Time interval = 2 min Drainage area = 6.620 ac Basin Slope = 0.0 % Tc method = USER Total precip. = 3.48 in Storm duration = 24 hrs C W 3.00 2.00 1.00 Tuesday, May 16, 2021 Peak discharge = 4.039 cfs Time to peak = 726 min Hyd. volume = 15,831 cuft Curve number = 63.2 Hydraulic length = 0 ft Time of conc. (Tc) = 18.10 min Distribution = Type II Shape factor = 484 Pre -Developed -Overall Site Hyd. No. 1 -- 2 Year 120 240 360 480 600 720 840 Hyd No. 1 Q (cfs) 5.00 4.00 3.00 2.00 1.00 0.00 960 1080 1200 1320 1440 1560 Time (min) 11 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Hyd. No. 2 Post Developed to Pond Hydrograph type = SCS Runoff Storm frequency = 2 yrs Time interval = 2 min Drainage area = 6.620 ac Basin Slope = 0.0 % Tc method = USER Total precip. = 3.48 in Storm duration = 24 hrs 16.00 12.00 4.00 Tuesday, May 18, 2021 Peak discharge = 22.64 cfs Time to peak = 716 min Hyd. volume = 46,133 cuft Curve number = 85.6 Hydraulic length = 0 ft Time of conc. (Tc) = 5.00 min Distribution = Type II Shape factor = 484 Post Developed to Pond Hyd. No. 2 -- 2 Year Q (cfs) 24.00 20.00 16.00 12.00 M IX 0.00 -- ' 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Hyd No. 2 Time (min) Hydrograph Report 12 Hydraflow Hydrographs Extension for AutoCADO Civil 31DO 2009 by Autodesk, Inc v6.066 Hyd. No. 3 Post Through Pond Hydrograph type = Reservoir Storm frequency = 2 yrs Time interval = 2 min Inflow hyd. No. = 2 - Post Developed to Pond Reservoir name = Wet Pond Storage Indication method used Q (cfs) 24.00 16.00 12.00 ie Post Through Pond Hyd. No. 3 -- 2 Year 600 1200 1800 2400 Hyd No. 3 Hyd No. 2 Tuesday, May 18, 2021 Peak discharge = 0.193 cfs Time to peak = 1440 min Hyd. volume - 41,817 cuft Max. Elevation = 382.30 ft Max. Storage - 37,711 cuft Q (cfs) 24.00 20.00 16.00 12.00 4.00 0.00 3000 3600 4200 4800 5400 6000 Total storage used = 37,711 cult Time (min) 15 Hydrograph Summary Repq y raflow Hydrographs Extension for AutoCADO Civil 3DO 2009 by Autodesk, Inc. v6.066 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval peak volume hyd(s) elevation strge used description (origin) (cfs) (min) (min) (curt) (ft) (cuft) 1 SCS Runoff 11.30 2 726 37,522 2 SCS Runoff 37.69 2 716 78,469 3 Reservoir 2.014 2 772 72,029 5 SCS Runoff 0.000 2 n/a 0 6 1 Reservoir 0.000 2 n/a 0 2 382.86 5 380.00 --- Pre -Developed -Overall Site ---- Post Developed to Pond 48,441 Post Through Pond ---- 1.0 Post -Developed to Pond 0.000 1.0inPost Through Pond Franklinton_pond_Phase 1.gpw Return Period: 10 Year I Tuesday, May 18, 2021 16 Hydrograph Report Hydraflow Hydrographs Extension for AutoCADO Civil 3DO 2009 by Autodesk, Inc. v6.066 Tuesday, May 18, 2021 Hyd. No. 1 Pre -Developed -Overall Site Hydrograph type = SCS Runoff Peak discharge = 11.30 cfs Storm frequency = 10 yrs Time to peak = 726 min Time interval = 2 min Hyd. volume = 37,522 cuft Drainage area = 6.620 ac Curve number = 63.2 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 18.10 min Total precip. = 5.06 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Q (cfs) 12.00 10.00 M N. 11 4.00 2.00 Pre -Developed -Overall Site Hyd. No. 1 -- 10 Year Q (cfs) 12.00 10.00 M. . �� 4.00 2.00 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 1 Hydrograph Report iIFl Hydraflow Hydrographs Extension forAutoCADO Civil 31DO2009 byAutodesk, Inc v6.066 Hyd. No. 2 Post Developed to Pond Hydrograph type = SCS Runoff Storm frequency = 10 yrs Time interval = 2 min Drainage area - 6.620 ac Basin Slope = 0.0 % Tc method - USER Total precip. = 5.06 in Storm duration - 24 hrs Q (cfs) 40.00 20.00 10.00 Tuesday, May 18, 2021 Peak discharge = 37.69 cfs Time to peak = 716 min Hyd. volume = 78,469 cuft Curve number = 85.6 Hydraulic length = 0 ft Time of conc. (Tc) = 5.00 min Distribution = Type II Shape factor = 484 Post Developed to Pond Hyd. No. 2 -- 10 Year 120 240 360 480 600 720 840 960 1080 Hyd No. 2 Q (cfs) 40.00 30.00 20.00 10.00 0.00 1200 1320 Time (min) Hydrograph Report 18 Hydraflow Hydrographs Extension for AutoCAD® Civil 31D® 2009 by Autodesk, Inc. v6.066 Tuesday, May 18, 2021 Hyd. No. 3 Post Through Pond Hydrograph type = Reservoir Peak discharge = 2.014 cfs Storm frequency = 10 yrs Time to peak = 772 min Time interval = 2 min Hyd. volume = 72,029 cuft Inflow hyd. No. = 2 - Post Developed to Pond Max. Elevation = 382.86 ft Reservoir name = Wet Pond Max. Storage = 48,441 cuft Storage Indication method used. Q (cfs) 40.00 30.00 20.00 10.00 W Post Through Pond Hyd. No. 3 -- 10 Year 600 1200 1800 2400 Hyd No., 3 - Hyd No. 2 3000 3600 4200 4800 5400 ® Total storage used = 48,441 cuft Q (cfs) 40.00 20.00 10.00 0.00 6000 Time (min) 21 Hydrograph Summary Re PC Wyd`raflow Hydrographs Extension for AutoCADO Civil 3D® 2009 by Autodesk, Inc. v6.066 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval peak volume hyd(s) elevation strge used description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 20.49 2 724 65,537 2 SCS Runoff 53.73 2 716 114,250 3 Reservoir 11.14 2 726 107,700 5 SCS Runoff 0.000 2 n/a 0 6 Reservoir 0.000 2 n/a 0 2 383.49 5 380.00 0.000 Pre -Developed -Overall Site Post Developed to Pond Post Through Pond 1.0 Post -Developed to Pond 1.0inPost Through Pond Fran klinton_pond_Phase 1.gpw Return Period: 50 Year Tuesday, May 18, 2021 Hydrograph Report 0 Hydraflow Hydrographs Extension for AutoCADO Civil 3DO 2009 by Autodesk, Inc. v6.066 Hyd. No. 1 Pre -Developed -Overall Site Hydrograph type = SCS Runoff Storm frequency - 50 yrs Time interval = 2 min Drainage area - 6.620 ac Basin Slope = 0.0 % Tc method - USER Total precip. = 6.74 in Storm duration = 24 hrs 18.00 15.00 12.00 A we] 3.00 Tuesday, May 18, 2021 Peak discharge = 20.49 cfs Time to peak = 724 min Hyd. volume = 65,537 cuft Curve number = 63.2 Hydraulic length = 0 ft Time of conc. (Tc) = 18.10 min Distribution = Type II Shape factor = 484 Pre -Developed -Overall Site Hyd. No. 1 -- 50 Year Q (cfs) 21.00 18.00 15.00 12.00 • 11 3.00 0.00 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time (min) Hyd No. 1 23 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD® Civil 31D® 2009 by Autodesk, Inc. v6.066 Tuesday, May 18, 2021 Hyd. No. 2 Post Developed to Pond Hydrograph type = SCS Runoff Peak discharge = 53.73 cfs Storm frequency = 50 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 114,250 cuft Drainage area = 6.620 ac Curve number = 85.6 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = USER Time of conc. (Tc) = 5.00 min Total precip. = 6.74 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 Q (cfs) 60.00 50.00 40.00 30.00 20.00 10.00 Post Developed to Pond Hyd. No. 2 -- 50 Year Q (cfs) 60.00 50.00 40.00 30.00 20.00 10.00 0.00 120 240 360 480 600 720 840 960 1080 1200 Time (min) Hyd No. 2 Hydrograph Report 24 Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2009 by Autodesk, Inc. v6.066 Hyd. No. 3 Post Through Pond Hydrograph type = Reservoir Storm frequency = 50 yrs Time interval = 2 min Inflow hyd. No. = 2 - Post Developed to Pond Reservoir name = Wet Pond Storage Indication method used Q (cfs) 60.00 50.00 40.00 30.00 10.00 Post Through Pond Hyd. No. 3 -- 50 Year 480 960 1440 1920 Hyd No. 3 Hyd No. 2 Tuesday, May 18, 2021 Peak discharge = 11.14 cfs Time to peak = 726 min Hyd. volume = 107,700 cuft Max. Elevation = 383.49 ft Max. Storage = 61,101 cuft 2400 2880 3360 3840 4320 ® Total storage used = 61,101 cuft Q (cfs) 60.00 50.00 40.00 30.00 20.00 10.00 0.00 4800 Time (min) Im '] § � � f � ! � MUM 3l)Nti#iI1 E� g # [ tmgd �luaiuuedV d u3[mH i 1011 �11,111 e r� r �Iw 34R I r I + r � R —^ ^ / f r ,rrr r `/ ! r r' r �f • / . �� I � � j i ' � I • ` 41 i�; �1 _ _ ` __� / ' rr,�r r /�+rr l' r / �' - lll��ll i'i {� ti ��••\t r 1.' � • r r • fr r. �' rr / r � �r i ++ + 1 •. � , , 1 � ���` �y �� 1 `� ''-- ' fif r.- `- �_� � rr � r + r' / r •' .. � t,+1+�+ r I I `. ��` 1. ``• .r r r r / r s♦ rrrl i,ll `j r .+ rr ...� _��.. 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CL L v/ E O ♦J A O O O O O O O O O O O O I �v 0 — — — LO 0/7 T14 ln0 O 13 00'06C ,06E '13 WIN 06 :Ul - 00'99+b e3S 0 U) v O1719£ '13 'AUI ul 017199- *13 *AUI 3nO0S'Z6£'13 WIN 3E 6£ :ul - 00'6b+17 e3S 0 "v uI 09,98E '13 'AUI h �� lnO 09'S8£ '13 'nu1 N Z �$ 00'69£ '13 WIN I I L I I * bZ :ul - 00'£L+£ e3S o CN v 00 0 LO O M M uI O17178£ '13 'AUI J 0 ln0 06'£8£ '13 'AUI 0 �Z 92 00,88E'13 w!2! N 0 £Z :ul - 00'£0+£ e3S co ul 00'£9£ '13 'AUI ^ lnO 00'£8£ '13 'AUI Z� 00'89£'13 WIN o � LZ :ul - 00'Z8+Z e3S N ca m 0 N 0 0 O ul O&M .13 'AUI lnO 09' l8£ '13 'AUI O9'89£ .13 WIN l :ul - OO179+0 e3S LO J c9 ul OV l8£ '13 'AUI 0029£'13 Two IlepnO - 00'00+0 e3S 0 o 0 0 0 0 0 _ M Y M N M M C7 W Triangle Site Design, PLLC Burlington Park Apartments - Phase 1 - Storm Drain "C" calculations Rational Runoff Coefficient "C" - 100 Storm System Catch Basin#101 Drainaoe Area (acres): 0.34 Proposed Land Uses: Land Use Description Acres % Site Runoff "C" "C" Roofs 0.01 3% 0.95 0.03 Asphalt/Concrete Pavement 0.29 85% 0.95 0.81 Lawn 0.04 12% 0.3 0.04 Wooded 0.00 0% 0.2 0.00 Total Area= 0.34 Cumulative "C" = Of 1 i1o= 7.92 Q10= 2.35 Catch Basin#102 Drainaoe Area (acresl: 0.12 ftwsLand Land Use Description Acres % Site Runoff "C" "C" Roofs 0.00 0% 0.95 0.00 Asphalt/Concrete Pavement 0.09 75% 0.95 071 Lawn 0.03 25% 0.3 0.08 Wooded 0.00 0% 0.2 0.00 Total Area= 0.12 Cumulative "C" = 0.79 1 iio= 7.92 Q10= 0.75 Catch Basin#103 Drainaoe Area (acres): 0.11 Proposed Land Uses: Land Use Description Acres % Site Runoff "C" "C" Roofs 0.03 27% 095 026 Asphalt/Concrete Pavement 0.06 55% 0.95 052 Lawn 0.02 18% 0.3 005 Wooded 0.00 0% 0.2 000 Tatar Area= 0.11 Cumulative "C" = 0.83 1 no= 792 Q10= 0.72 Catch Basin#104 OWnaV Area (.7M 0.16 Proposed Land Uses: Land Use Description Acres % Site Runoff "C" "C" Roofs 0.01 6% 0.95 0.06 Asphalt/Concrete Pavement 0.11 69% 0.95 0.65 Lawn 0.04 25% 0.3 0.08 Wooded 0.00 0% 0.2 0.00 Total Area= 0.16 Cumulative "C" = 0.79 1 i10= 7.92 Q1o= 1.00 Catch Basin#105 UW'ayoe Area (awes). 0.33 Proposed Land Users Land Use Description Acres %Site Runoff "C" "C" Roofs 0.04 12% 0.95 012 Asphalt/Concrete Pavement 020 61 % 0.95 058 Lawn 0.09 27% 0.3 0 08 Wooded 000 0% 02 000 Total Area= 0.33 Cumulative "C" = 0 77 1 i1o= 792 Q10= 2.02 Catch Rasln#106 Drainage Area Lres1: 0.24 Amway Lod UM5.1 Land Use Descriotion Roofs Asphalt/Concrete Pavement Lawn Wooded Total Area= (Yard Inlet#107 Drainage Area (acres]: 0.09 Proposed Land Uses: Land Use Descriotion Roofs Asphalt/Concrete Pavement Lawn Wooded Total Area= (:Ieanout#1 r]raln�na dla: Cleancut# 1I 0.06 Land Use Descriotion Roofs Asphalt/Concrete Pavement Lawn Wooded Total Area= 0.06 Land Use Descriotion Roofs Asphalt/Concrete Pavement Lawn Wooded To! at Area, 0.06 Land Use Description Roofs Asphalt/Concrete Pavement Lawn Wooded Acres % Site 0.00 0% 0.15 63% 009 38% 0.00 0% 0.24 Cumulative "C" 1 i10= Qio= Acres % Site 0.00 0% 0.00 0% 0.09 100% 0.00 0% 0.09 Cumulative "C" _ ii0= Qio= Acres % Site 0.06 100% 0.00 0% 0.00 0% 000 0% 006 Cumulative "C" _ HO= Q10= Acres % Site 0.06 100% 0.00 0% 0.00 0% 0.00 0% 0.06 Cumulative "C" _ 1 n0= Q70= _Acres % Site 0.06 100% 0.00 0% 0.00 0% 0.00 0% 006 Cumulative "C" _ 1 iio= Q10= Runoff "C" "C" 0.95 0.00 0.95 0.59 0.3 0.11 0.2 000 0.71 7.92 1.34 Runoff"C" C. 0.95 0.00 0.95 0.00 0.3 0.30 0.2 0.00 0.30 7.92 0.21 Runoff"C" "C" 0.95 095 0.95 0.00 0.3 000 0.2 000 095 7.92 0.45 Runoff "C" "C" 0.95 0.95 0.95 0.00 0.3 0.00 0.2 0.00 0.95 792 0.45 Runoff"C" "C" 0.95 0.95 0.95 0.00 0.3 0.00 0.2 0.00 0.95 7.92 0.45 0.06 Land Use Description Roofs Asphalt/Concrete Pavement Lawn Wooded Acres % Site 006 100% 0.00 0% 0.00 0% 0.00 0% 0.06 Cumulative "G" _ 1 h o= Qio= Runoff "C "C" 0.95 095 0.95 0.00 0.3 000 0.2 0.00 0 95 792 045 Yard Inlet#112 Drafnaoe Area (acres): 0.23 Proposed Land L'ses: Land Use_Description Acres % Site Runoff "C" "C" Roofs 0.04 17% 0.95 0.17 Asphalt/Crncrete Pavement 0.08 35% 0.95 033 Lawn 0.11 48% 03 0.14 Wooded 0.00 0% 0.2 000 Total Area= 0.23 Cumulative "C" = 0 64 1 HO= 792 Q1o= 1.16 Cleanout# 113 Drainage Area (acres]: 0.06 ifte 4 f Land Uses Land Use Description Acres % Site Runoff "C" "C" Roofs 0.06 100% 0.95 0.95 Asphalt/Concrete Pavement 0.00 0% 0.95 0.00 Lawn 0.00 0% 0.3 0.00 Wooded 0.00 0% 0.2 0.00 Total Area= 0.06 Cumulative "C" = 0.95 1 lip= 7.92 Q1o= 0.45 Cleanout# 114 pr�1n"Area (acres): 0.06 Proposed Land Uses: Land Use Description Acres °° Site Runoff "C" "C" Roofs 0.06 100% 0.95 0.95 Asphalt/Concrete Pavement 0.00 0% 0.95 0.00 Lawn 0.00 0% 0.3 0.00 Wooded 0.00 0% 02 0.00 Total Area= 0.06 Cumulative "C" = 0.95 1 lip= 7.92 Q1o= 0.45 Cleanout# 115 Drafnaoe Area (acres). 0.06 P_rplva+sed f and Uses: Land Use Description Acres % Site Runoff "C" "C" Roofs 0.06 100% 0.95 0.95 Asphalt/Concrete Pavement 0.00 0% 0.95 0.00 Lawn 0.00 0% 0.3 0.00 Wooded 0.00 0% 0.2 0.00 Total Area= 0.06 Cumulative "C" = 0.06 1 iio= 7.92 Q1o= 0.45 Cleanotit# 116 Prainage Area (acres): 0.06 Proposed Land Uses: Land Use Description Acres % Site Runoff "C" "C" Roofs 0.06 100% 0.95 0.95 Asphalt/Concrete Pavement 0.00 0% 0,95 0.00 Lawn 0.00 0% 0.3 0.00 Wooded 0.00 0% 0.2 0.00 Total Area= 0.08 Cumulative'V = 0.95 1 ho= 7.92 Qio= 0.45 Catch Basin#117 Drainage Area (acres): 0.11 Proposed Land Uses: Land Use Description Acres % Site Runoff "C" "C" Roofs 0.00 0% 0.95 0.00 Asphalt/Concrete Pavement 0.10 91% 0.95 0.86 Lawn 0.01 9% 03 003 Wooded 0.00 0% 0.2 0.00 Total Area= 0.11 Cumulative "C" = 089 1 iic= 792 Qia= 0.76 Yard Inlet#118 Drainage Area {acres• 0.07 Proposed Land Uses' Land Use Description Acres % Sife Runoff "C" "C" Roofs 0.04 57% 0.95 0.54 Asphalt/Concrete Pavement 0.01 14% 0.95 0.14 Lawn 002 29% 0.3 0.09 Wooded 0.00 0% 0.2 0.00 Total Area= 0.07 Cumulative "C" = a 16 1 iio= 7.92 Qio= 0.42 Cleanout#119 �JratnaaeArea (acres-): 0.03 Proposed Land Uses: Land Use Description Acres % Site Runoff "C" "C" Roofs 0.03 100% 0.95 0.95 Asphalt/Concrete Pavement 0.00 0% 0.95 0.00 Lawn 0.00 0% 0.3 0.00 Wooded 0.00 0% 0.2 000 Total Area= 0.03 Cumulative "G" = 0 95 1 h o= 7.92 Q10= 023 Cleanout#120 Drainage Area (acres 0.03 i3 o�vsecl Land Uses; Land Use Description Roofs Asphalt/Concrete Pavement Lawn Wooded Total Area= Acres % site Runoff "C" "C" 0.03 100% 0.95 0.95 0,00 0% 0.95 0.00 0.00 0% 0.3 0.00 0.00 0% 0.2 0.00 0.03 Cumulative "C" = 695 iio= 1 7.92 Q10= 0.23 Catch Basin#121 Drainage Area (acres): 0.19 pmmsed Land U.4es. Land Use Descriotion Acres % Site Runoff "C" "C" Roofs 0.04 21 % 0.95 020 Asphalt/Concrete Pavement 0.13 68% 0.95 0.65 Lawn 0.02 11 % 0.3 0.03 Wooded 0.00 0% 0.2 0.00 Total Area= 0,19 Cumulative "C" = 0.88 1 HO= 7.92 Q 10= 1.33 Catch Basin#122 Drainage Area (acres): 0.03 Prgnosed Land Uses. Land Use Description Acres % Site Runoff "C" "C" Roofs 0.00 0% 0.95 0.00 Asphalt/Concrete Pavement 0.03 100% 0.95 0.95 Lawn 0.00 0% 0.3 0.00 Wooded 0.00 0% 02 0.00 Total Area= 003 Cumulative "C" = 095 1 iio= 7.92 Q10= 0.23 Catch Basin#123 DrI Area !acres).• 0.13 Proposed Land Uses: Land Use Descriotion Acres % Site Runoff "C" "C" Roofs 0.00 0% 0.95 0.00 Asphalt/Concrete Pavement 010 77% 0.95 0.73 Lawn 0.03 23% 0.3 0.07 Wooded 0.00 0% 02 0.00 Total Area= 0.13 Cumulative "C" = 0:80 1 i1o= 7.92 Q1o= 0.82 Catch Basin#124 Drainage Area (acres): 0.14 Proposed Land Uses Land Use Description Acres % Site Runoff "C" "C" Roofs 0.00 0% 0.95 0.00 Asphalt/Concrete Pavement 0.12 86% 0.95 0.81 Lawn 0.02 14% 0.3 004 Wooded 0.00 0% 0.2 0.00 Total Aream 0.14 Cumulative "C•= 0.86 1 i1o= 7.92 Q1o= 0.95 Catch Basin# 125 Der InagArga (acresJ. 0.09 Proposed Land Uses: Land Use Description Roofs Asphalt/Concrete Pavement Lawn Wooded Total Area= Acres % Site 000 0% 0.06 67% 0.03 33% 000 0% 0.09 Cumulative "C" = 1 MO= Q10= Runoff"C" "C" 0.95 0.00 0.95 0.63 0.3 0.10 0.2 0.00 0.73 7.92 0.52 Catch Basin# 126 Drainage Area (acres): 0.35 Proposed Land Uses: Land Use Description Acres % Site Runoff "C" "C" Roofs 0.00 0% 0.95 0.00 Asphalt/Concrete Pavement 0.24 69% 0.95 0.65 Lawn 0.11 31 % 0.3 0.09 Wooded 0.00 0°% 0.2 0.00 Total Area= 0.35 Cumulative'V = 0.75 1 it0= 7.92 Qio= 2.07 Catch Basin#127 0.17 Land Use Description Roofs Asphalt/Concrete Pavement Lawn Wooded Total Area= Acres % Site 0.03 18% 0.10 59% 0.04 24% 0.00 0% 0.17 Cumulalve"C"= 1 ito= Qio= Runoff "C" "C" 0.95 0.17 0.95 0.56 0.3 0.07 0.2 0.00 0.80 7.92 1.07 Catch Basin# 128 Drainage Area (acres): 0.2 Pr=sed Land Uses: Land Use Description Acres % Site Runoff "C" "C" Roofs 0.00 0% 0.95 0.00 Asphalt/Concrete Pavement 0.13 65% 0.95 0.62 Lawn 0.07 35% 0.3 0.11 Wooded 0.00 0% 0.2 0.00 Total Area= 0.20 Cumulative "C"= 0.72 1 iio= 792 Qio= 1.14 Catch Basin#129 Drainage Area (acreJ: 0.26 1'�mwdViand uses Land Use Description Acres % Site Runoff "C" "C" Roofs 0.00 0% 0.95 0.00 Asphalt/Concrete Pavement 0.21 81% 0.95 0.77 Lawn 0.05 19% 0.3 0.06 Wooded 0.00 0% 0.2 0.00 Total Area 0.26 Cumulative "C" = 0 -Y3 1 iio= 7.92 Qio= 1.70 Catch Ba5in#138 Drain A 0.19 Proposed Land Uses Land Use Description Acres %Site Runoff "C" "C" Roofs 0.00 0% 0.95 0.00 Asphalt/Concrete Pavement 0.16 84% 0.95 0.80 Lawn 0.03 16% 0.3 0.05 Wooded 0.00 0% 0.2 0.00 Total Area= 0.19 Cumulative "C" = 0.85 1 iio= 7.92 QtO= 1.28 Yard Inlet#131 ❑ralnage Area Iacres): 0.39 Pro La Land Use Description Acres % Site Runoff "C" "C" Roofs 0.00 0% 0.95 000 Asphalt/Concrete Pavement 0.00 0% 0.95 0.00 Lawn 0.39 100% 0.3 0.30 Wooded 000 0% 0.2 0.00 Total Area- 0.39 C.lImUIa ive "C" = 0.30 11 a= 7.92 Q1o= 0.93 Catch Basin#132 Drainage Area (acres 0.16 Proposed Land Uses., Land Use Description Acres % Site Runoff "C" "C" Roofs 0.04 25% 0.95 0.24 Asphalt/Concrete Pavement 0.09 56% 0.95 0.53 Lawn 0.03 19% 0.3 0.06 Wooded 0.00 0% 0.2 000 Total Area= 0.16 Cumulative "C" = 0.83 i10= 7.92 Q 10= 1.05 Catch Basin#133 0.26 Land Use Description Roofs Asphalt/Concrete Pavement Lawn Wooded Total Area= Area Drain#134 Drainage Area (acres): 0.02 Proposed Land Uses: Land Use Description Roofs Asphalt/Concrete Pavement Lawn Wooded Total Area= Acres % Site 0.04 15% 0.18 69% 0.04 15% 0.00 0% 0.26 Cumulative "C" _ ho= Q10= Runoff"C" "C" 0.95 0.15 0.95 066 0.3 0.05 0.2 0.00 0.85 7.92 1.75 Acres % Site Runoff "C" "C" 0.00 0% 0.95 000 0.01 50% 0.95 0.48 0.01 50% 0.3 015 0.00 0% 0.2 0.00 0.02 Cumulative "C" = 0 6:1 110= 1 792 Q10= 0.10 Cleanout#135 Daiggo Anmf 0.07 PAWOMdLand Uses Land Use Description Acres % Site Runoff "C" "C" Roofs 0.07 100% 0.95 095 Asphalt/Concrete Pavement 000 0% 0.95 0.00 Lawn 000 0% 0.3 000 Wooded 0.00 0% 0.2 0.00 Total Area= 0.07 Cumulative "C" = 0 95 1 i1o= 792 Q10= 0.53 Cleanout#136 Dralnaae Area (acres): 0.07 Proposed Land Uses. Land Use Description Acres % Site Runoff "C" "C" Roofs 0.07 100% 0.95 0.95 Asphalt/Concrete Pavement 0.00 0% 0.95 0.00 Lawn 0.00 0% 0.3 0.00 Wooded 0.00 0% 0.2 0.00 Total Area= 0.07 Cumulative' C" = 0.95 I HO= 7.92 010= 0.53 Cleanout#137 DrWnaae Area lacresl: 0.07 Proposed Land Uses Land Use Descrintion Acres % Site Runoff "C" "C" Roofs 0.07 100% 0.95 0.95 Asphalt/Concrete Pavement 0.00 0% 0.95 0.00 Lawn 0.00 0% 0.3 0.00 Wooded 0.00 0% 0.2 0.00 Total Area= 0.07 Cumulative "C" = 0.95 1 ho= 7.92 Qia= 0.53 Cleanout# 138 DrainawAr f{7es], 0.07 provosed Land Uses: Land Use Description Roofs Asphalt/Concrete Pavement Lawn Wooded Total Area= Basin# 0.11 Proposed Land Uses: Land Use Description Roofs Asphalt/Concrete Pavement Lawn Wooded Acres % Site 0.07 100% 0.00 0% 0.00 0% 0.00 0% 0.07 Cumulative "C" = 1 ii0= Qio= Runoff "C" "C" 0.95 0.95 0.95 0.00 0.3 0.00 0.2 0.00 0.95 7 92 0.53 Acres % Site Runoff "C" "C" 0.00 0% 0.95 0.00 0.10 91 % 0.95 0.86 0.01 9% 0.3 0.03 0.00 0% 0.2 0.00 0.11 Cumuiative "C" = 0 89 110= 7.92 Q10= 0.78 Yard Inlet#140 Dralr>age Area lacresl: 0.06 Rased Land uses Land Use Description Acres % Site Runoff "C" C. Roofs 004 67% 0.95 0.63 Asphalt/Concrete Pavement 0.01 17% 0.95 0.16 Lawn 0.01 17% 0.3 0.05 Wooded 0.00 0% 0.2 0.00 Total Area= 0.06 Cumulative "C" = 0.84 1 iio= 7.92 Q10= 0.40 EROSION CONTROL CALCULATIONS EROSION CONTROL CALCS (RIP -RAP CALCULATIONS) Project Information Project Name: Burlington Paris Apartments - Phase 1 Project #: Designed by: RG Date: Revised by: Date: Checked by: Date: Rio -Rap Apron#1 Pipe Diameter Pipe Slope Manning's number Flow Velocity Dissipator Dimensions * All unils are in feet ** Dissipator pad designed for full flow of pipe d= s= n= Q= V= Zone = Stone Filling Class = Entry Width ( 3 X Do ) _ Length ( 6 X Do) _ Width (La + Da) _ Min. Thickness = Min. Stone Diameter- B 30 3.57 % 0.013 20.53 cfs 13.14 ft/s 7.5 ft 15.0 ft 17.5 ft 22 inches 6 inches ■ 15. [3►i .5 17.5 1 RIP-RAP-BurlingtonPark.xls 3/10/2021 Page 1 of 4 Rio -Rao Auron#2 Pipe Diameter Pipe Slope Manning's number Flow Velocity Dissipator Dimensions * d= s= n= Q= V= Zone = Stone Filling Class = Entry Width ( 3 X Do ) = Length (6 X Do) = Width (La + Do) = Min. Thickness = Min. Stone Diameter- B 18 in 2.44 % 0.013 20.53 cfs 36.50 ft/s 4.5 ft 9.0 ft 10.5 ft 22 inches 6 inches 10.5 * All units are in feet — Dissipator pad designed for full flow of pipe RIP-RAP-BurlingtonPark.xis 3/10/2021 Page 2 of 4 Rin-Rao Apron#3 Pipe Diameter d= 33 in Pipe Slope s= 0.76 % Manning's number n= 0.013 Flow 4 Q= 1 24.38 cfs Velocity 4 V = 12.90 ft/s Dissipator Dimensions * Zone = 1 2 Stone Filling Class = B Entry Width ( 3 X AO ) = 8.3 ft Length (6 X AO) = 16.5 ft Width (La + AO) = 19.3 ft Min. Thickness = 22 inches Min. Stone Diameter-- 6 inches 19.3 'All unils are in feet ** Dissipator pad designed for full flow of pipe I RIP-RAP-BurlingtonPark.xls 3/10/2021 Page 3 of 4 Rio -Rao Apron#4 Pipe Diameter d= 15 in Pipe Slope s= 2.5 % Manning's number n= 0.013 Flow 4 Q= I 2 cfs Velocity 4 V = 5.12 ft/s Dissipator Dimensions ' Zone = I 2 Stone Filling Class = B Entry Width ( 3 X AO ) = 3.8 It Length (6XAO) = 7.5It Width (La + AO) = 8.8 It Min. Thickness = 22 inches Min. Stone Diameter-- 6 inches I 7.5 It I 3.8 All units are in feet Dissipator pad designed for full flow of pipe RIP-RAP-BurlingtonPark.xls 3/10/2021 Page 4 of 4 EROSION CONTROL CALCS (SKIMMER BASIN#1) Project Information Project Name: Burlington Park Apartments - Phase 1 Project #: Designed by: RG Date: Revised by: Date: Checked by: Date: Skimmer Basin #1 Drainage Area Total, AT= 5.99 AC Disturbed, Ao= 5.99 Ac 10-year Runoff (010) C = 050 T. = 5.00 min 110 = 7.27 in/hr Q10 = 21.8 cfs Surface Area Required SA = 435sf x 010 SA = 9,472 sf Volume Required VR = 1800 cdAc x Ao Va = 10,782 cf Sediment Trap Dimensions L = 160 ft (Spillway Length) W = 75 ft (Spillway Width) D = 20 R (Depth or Storage) Side Slopes = 2 :1 Lw = 168 ft Lb„ = 152 ft W Wb,t Wbvm 83 ft L,. Wba= 67 ft UW Ratio= 21 :1 (must be 2:1 to 6:1) Elevations Description Elevation Top of Berm 389.00 (allow 1ft freeboard above spillway flow height) Emergency Spillway 387.50 Sediment Storage 387.00 Cleanoul Mark 386.00 (half or storage height) Bottom 38500 Provided SAP= 12,000 sf > 9,472 Vp = 22,184.0 cf > 10,782 Emergency Spillway - 10 Year Storm 110 = 7.27 in/hr Q10 = 21.77 Or. h= 05ft Cw = 3 L.w= 21 It Project Information Skimmer Basin #2 Drainage Area 10-year Runoff (Q10) Surface Area Required EROSION CONTROL CALCS (SKIMMER BASIN#2) Project Name: Burlington Park Apartments - Phase 1 Project #: Designed by: RG Date: Revised by: Date: Checked by: Date: Total, AT= 1.14 Ac Disturbed, Ao= 1 14 Ac C = 0.50 T. = 5.00 min 110 = 7.27 inlhr Q10 = 4.1 cfs SA = 435sf x Q 10 SA = 1,803 sf Volume Required VR = 1800 cf/Ac x AD VR = 2,052 cf Sediment Trap Dimensions L = 70 ft (Spillway Length) W = 30 ft (Spillway Width) D = 2.0 ft (Depth of Storage) Side Slopes = 2 :1 LIW = 78 ft Lm= 62 ft W W wtw= 38 ft Lw= Wes= 22 ft LNV RaBo= 2.3 :1 (must be 2:1 to 6:1) Elevations Description Elevation Top of Berm 383.00 (allow 1ft freeboard above spillway flow height) Emergency Spillway 381.50 Sediment Storage 38100 Cleanout Mark 38000 (half of storage height) Bottom 379.00 Provided SAP= 2,100 sf > 1,803 Vp = 3,464.0 cf > 2,052 Emergency Spillway -10 Year Storm 110 = 7.27 in/hr 010 = 4.14 cfs h= 05ft C.. = 3 Lw= 10 ft EROSION CONTROL CALCS (SKIMMER BASIN#3) Project Information Project Name: Burlington Park Apartments - Phase 1 Project #: Designed by: RG Date: Revised by: Date: Checked by: Date: Skimmer Basin #3 Drainage Area Total, AT= 6.93 Ac Disturbed, AD= 6.93 Ac 10-year Runoff (Q10) C = 050 T. = 5 00 min 110 = 7.27 in/hr Q10 = 25.2 cfs Surface Area Required SA = 435sf x 010 SA = 10,958 sf Volume Required VR = 1800 d/Ac x Ao VR = 12,474 cf Sediment Trap Dimensions I. = 225 ft (Spillway Length) W = 50 ft (Spillway width) D = 2.0 ft (Depth of Storage) Side Slopes = 2 :1 Lew= 233 ft Lbd= 217 ft Wrm W� WhV= 58 ft Lby= Wba= 42 ft L/W Ratio= 4.5 :1 (must be 2:1 to 6:1) Elevations Description E/evabo Top of Berm 38300 (allow 1ft freeboard above spillway flow height) Emergency Spillway 381.50 Sediment Storage 381.00 Cleanout Mark 380.00 (half of storage height) Bottom 379.00 Provided SAP= 11,250 sf > 10,958 VP= 20,364.0 cf > 12,474 Emergency Spillway - 10 Year Storm 110 = 7.27 in/hr Q10 = 26.19 cfs h = 0.5 ft C„. = 3 Lw= 24 ft 5An .<r 1j1U,., # / Calculate Skimmer Size Basin Volume in Cubic Feet 22.184 Cu.Ft Skimmer Size 3.0 Inch Days to Drain" 3 Days Orifice Radius 1.3 Inch[es] Orifice Diameter 2.6 Inch[es] 'ire NC assume 3 days to drain Estimate Volume of Basin Length Width Top of water surface in feet 160 75 Feet VOLUME 22184 Cu. Ft. Bottom dimensions in feet 152 67 Feet Depth in feet 2 Feet s";`AA v IfAr,. ' # Z Calculate Skimmer Size Basin Volume in Cubic Feet 3,464 Cu.Ft Skimmer Size 1.5 Inch Days to Drain* 3 Days Orifice Radius 0.6 Inch[es] Orifice Diameter 1.2 Inch[es] In NC assume 3 days to drain Estimate Volume of Basin Length width Top of water surface in feet 70 3n Feet VOLUME 3464 Cu. Ft. Bottom dimensions in feet 62 22 1 Feet Depth in feet 2 Feet 2I &45'1 # 3 .,alculate Skimmer Size 3asin Volume in Cubic Feet 20,364 Cu.Ft Skimmer Size 3.0 Inch )ays to Drain* 3 Days Orifice Radius 1.3 Inch[es] Orifice Diameter 2.5 Inch[es] q NC assume 3 days to draln Estimate Volume of Basin Lengkh width op of water surface in feet 225 50 Feet VOLUME 20364 Cu. Ft. 3ottom dimensions in feet 217 42 Feet )epth in feet 2 Feet EROSION CONTROL CALCS (SKIMMER BASIN#1) Project Information Project Name: Burlington Park Apartments - Phase 1 Project #: Designed by: RG Date: Revised by: Date: Checked by: Date: Anti -Flotation Device 4' x 4' Outlet Structure Area: 16.0 sf Top of Basin Elev.: 387.0 Bottom of Basin Elev.: 385.0 Volume: 32.0 cf Weight: 1997 Ibs Factor of Safety 1.20 WT Req'd of Anti -Flotation Device: 2,396 Ibs Volume of Concrete Req'd: 16.0 cf Volume Provided: 69.5 cf (Water Displaced - Top of Pond to Bottom of Pond) (Unit WT of Concrete = 150 pcf) (4'x4' riser x 2.0' = 32cf, 5'x5' footing x 1.5'=37.5cf) EROSION CONTROL CALCS (SKIMMER BASIN#2) Project Information Project Name: Project #: Designed by: Revised by: Checked by: Anti -Flotation Device Burlington Park Apartments - Phase 1 RG 4' x 4' Outlet Structure Area: 16.0 sf Top of Basin Elev.: 381.0 Bottom of Basin Elev.: 379.0 Volume: 32.0 cf Weight: 1997 Ibs Factor of Safety 1.20 WT Req'd of Anti -Flotation Device: 2,396 Ibs Volume of Concrete Req'd: 16.0 cf Volume Provided: 69.5 cf Date: Date: Date: (Water Displaced - Top of Pond to Bottom of Pond) (Unit WT of Concrete = 150 pcf) (4'x4' riser x 2.0' = 32cf, 5'x5' footing x 1.5'=37.5cf) EROSION CONTROL CALCS (SKIMMER BASIN#3) Project Information Project Name: Burlington Park Apartments_- Phase 1 Project #: Designed by: RG Date: Revised by: Date: Checked by: _ Date: Anti -Flotation Device 4' x 4' Outlet Structure Area: 16.0 sf Top of Basin Elev.: 381.0 Bottom of Basin Elev.: 379.0 Volume: 32.0 cf Weight: 1997 Ibs Factor of Safety 1.20 WT Req'd of Anti -Flotation Device: 2,396 Ibs Volume of Concrete Req'd: 16.0 cf Volume Provided: 69.5 cf (Water Displaced - Top of Pond to Bottom of Pond) (Unit WT of Concrete = 150 pcf) (4'x4' riser x 2.0' = 32cf, 5'x5' footing x 1.6=37.5cf) NORTH AMERICAN GREEN' CHANNEL ANALYSIS > > > IQnPDW Ditch #1 Name Temporary Ditch #1 Discharge 12.6 Channel Slope 0.0128 Channel Bottom Width 1 Left Side Slope 2 Right Side Slope 2 Low Flow Liner Retardence Class C 6-12 in Vegetation Type None Vegetation Density None Soil Type Sandy Loam (GM) DS75 North American Green 5401 St. Wendel -Cynthiana Rd. Poseyville, Indiana 47633 Tel. 800.772.2040 > Fax 812.867.0247 www.nagreen.com ECM DS v7.0 Normal Permissible Calculated Safety I Staple Phase Reach Discharge I Velocity I I Mannings N I I Remarks I Depth Shear Stress Shear Stress Factor Pattern DS75 Straight 12.6 cfs 3.59 ft/s 1.1 ft 0.033 1.6 Ibs/ft2 0.88 Ibs/ft2 1.82 STABLE D Unvegetated Underlying Straight 12.6 cfs 3.59 ft/s 1.1 ft 0.033 1.51 Ibs/ft2 0.47 Ibs/ft2 3.19 STABLE D Substrate NORTH AMERICAN GREEN CHANNEL ANALYSIS > > > IQMP2 W Ditch #2 Name Temporary Ditch #2 Discharge 3.5 Channel Slope 0.0456 Channel Bottom Width 1 Left Side Slope 2 Right Side Slope 2 Low Flow Liner Retardence Class C 6-12 in Vegetation Type None Vegetation Density None Soil Type Sandy Loam (GM) DS75 North American Green 5401 St. Wendel -Cynthiana Rd. Poseyville, Indiana 47633 Tel. 800.772.2040 > Fax 812.867.0247 www.nagreen.com ECM DS v7.0 Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern DS75 Straight 3.5 cfs 4.33 ft/s 0.43 ft 0.031 1.6 Ibs/ft2 1.23 Ibs/ft2 1.3 STABLE D Unvegetated Underlying Straight 3.5 cfs 4.33 ft/s 0.43 ft 0.031 1.51 Ibs/ft2 0.78 Ibs/ft2 1.93 STABLE D Substrate NORTH AMERICAN GREEN' CHANNEL ANALYSIS > > > IQJMPD W Ditch #3 North American Green 5401 St. Wendel -Cynthiana Rd. Poseyville, Indiana 47633 Tel. 800.772.2040 > Fax 812.867.0247 www.nagreen.com ECM DS v7.0 Name Temporary Ditch #3 Discharge 3 Channel Slope 00224 Channel Bottom Width 1 Left Side Slope 2 Right Side Slope 2 Low Flow Liner Retardence Class C 6-12 in Vegetation Type None Vegetation Density None Soil Type Sandy Loam (GM) DS75 Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks I Depth Shear Stress Shear Stress Factor Pattern DS75 Straight 3 cfs 3.02 ft/s 0.5 ft 0.034 1.6 Ibs/ft2 0.7 Ibs/ft2 2.3 STABLE D Unvegetated Underlying Straight 3 cfs 3.02 ft/s 0.5 ft 0.034 1.51 Ibs/ft2 0.43 Ibs/ft2 3.52 STABLE D Substrate NORTH AMERICAN GREEN' CHANNEL ANALYSIS > > > Grass Channel it1 North American Green 5401 St. Wendel -Cynthiana Rd. Poseyville, Indiana 47633 Tel. 800.772.2040 > Fax 812.867.0247 www.nagreen.com ECM DS v7.0 Name Grass Channel #1 Discharge 0.9 Channel Slope 0.0134 Channel Bottom Width 0 Left Side Slope 3 Right Side Slope 3 Low Flow Liner Retardence Class C 6-12 in Vegetation Type None Vegetation Density Good 65-79% Soil Type Clay Loam (CL) DS75 Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern DS75 Straight 0.9 cfs 1.59 ft/s 0.43 ft 0.038 1.6 Ibs/ft2 0.36 Ibs/ft2 4.4 STABLE D Unvegetated Underlying Straight 0.9 cfs 1.59 ft/s 0.43 ft 0.038 1.74 Ibs/ft2 0.17 Ibs/ft2 10,11 STABLE D Substrate NORTH AMERICAN GREEN' CHANNEL ANALYSIS > > > Carats Channel 09 Name Grass Channel #2 Discharge 0.8 Channel Slope 0.0122 Channel Bottom Width 5 Left Side Slope 3 Right Side Slope 3 Low Flow Liner Retardence Class C 6-12 in Vegetation Type None Vegetation Density Good 65-79% Soil Type Clay Loam (CL) DS75 North American Green 5401 St. Wendel -Cynthiana Rd. Poseyville, Indiana 47633 Tel. 800.772.2040 > Fax 812.867.0247 www.nagreen.com ECM DS v7.0 Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor Pattern DS75 Straight 0.8 cfs 1.04 ft/s 0.14 ft 0.041 1.6 Ibs/ft2 0.11 Ibs/ft2 14.8 STABLE D Unvegetated Underlying Straight 0.8 cfs 1.04 ft/s 0.14 ft 0.041 1.74 Ibs/ft2 0.1 Ibs/ft2 11.53 STABLE D Substrate NORTH AMERICAN GREEN CHANNEL ANALYSIS > > > Grass Channel #3 Name Grass Channel #3 Discharge 0.3 Channel Slope 0.0305 Channel Bottom Width 5 Left Side Slope 6 Right Side Slope 6 Low Flow Liner Retardence Class C 6-12 in Vegetation Type None Vegetation Density Good 65-79% Soil Type Clay Loam (CL) DS75 North American Green 5401 St. Wendel -Cynthiana Rd. Poseyville, Indiana 47633 Tel. 800.772.2040 > Fax 812.867.0247 www.nagreen.com ECM DS v7.0 Normal Permissible Calculated Safety Staple Phase Reach Discharge Velocity Mannings N Remarks Depth Shear Stress Shear Stress Factor pattern DS75 Straight 0.3 cfs 0.94 ft/s 0.06 ft 0.04 1.6 Ibs/ft2 0.11 Ibs/ft2 14.11 STABLE D Unvegetated Underlying Straight 0.3 cfs 0.94 ft/s 0.06 ft 0.04 1.74 Ibs/ft2 0.11 Ibs/ft2 16.43 STABLE D Substrate NORTH AMERICAN GREEN' CHANNEL ANALYSIS > > > Grass Channel *4 North American Green 5401 St. Wendel -Cynthiana Rd, Poseyville, Indiana 47633 Tel. 800.772.2040 > Fax 812.867.0247 www.nagreen.com ECM DS v7.0 Name Grass Channel #4 Discharge 0.9 Channel Slope 0.0231 Channel Bottom Width 15 Left Side Slope 3 Right Side Slope 3 Low Flow Liner Retardence Class C 6-12 in Vegetation Type None Vegetation Density Good 65-79% Soil Type Sandy Loam (GM) DS75 Phase Reach Discharge Velocity Normal Mannings N Permissible Calculated Safety Remarks Staple Depth Shear Stress Shear Stress Factor Pattern DS75 Straight 0.9 Cfs 0.89 ft/s 0.07 ft 0.041 1.6 Ibs/ft2 0.1 Ibs/ft2 16.75 STABLE D Unvegetated Underlying Straight 0.9 cfs 0.89 ft/s 0.07 ft 0.041 1.51 Ibs/ft2 0.09 Ibs/ft2 16.09 STABLE D Substrate