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HomeMy WebLinkAbout20131226 Ver 1_Stormwater Approval_20131125J�r�ezn /F���s 1 ¢z e titmrmiv .ter ?�lutrient 1 ��d��ccc��untin � _ mil 1'er _�.o LProceedta Watershed Characteristic Skip to BMP Characteristics I Skip to Summary L General Medal lnstru wim oetailsofthe development should be entered in the first two tabs (Watershed Characteristics and BMP Characteristics); results may be viewed ..the third tab (Development Summary). The cells shaded g rey ere those that allow /require user input. Selecting the physiographlc /geologic region and precipitation location most appropriate for the development of interest le essential in producing accurate results. Maps have been provided (see right) m assist in this selection, but soil maps should be consulted, or soil tests performed, toveritythe presence of Triassic nrs.ndhill /coastal plain soils. A list of counties locatedwithin, or partially within, each region has also been provided for convenience. - Eathtab has detailed instructions and guidelines for entering the necessary information (this information is also included below). To remove an entry Ina cell with a dropdown list, seleetlhe blank row from the dropdown menu or select the cell and press the 'delete' button. II. Specific Tab GUidalimas Wataahad Chanatarhtbs - Fornon-residential watersheds, indicate areas of each land use type in Column l for both pre- end post - development conditions. - For residential watersheds, complete the required information in Column 2 for both pre - andpoet- development conditions. - If a given land use Is not present In the given watershed, leave the cell blank or enter a Ensure that land use areas entered for both pre. and post-development conditions match the total developi,— area entered in cell O21. Residential areas may be e„ tared by average lot size (column, pan A), or may be separated into individual land uses (column 2, pert B) do NOT list out individual lend within an area already described by lot size. Unless runoff flowing onto the development from offslte 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. BMP Chanctaristica - Thls spreadsheet allows the development to be divided into as many as 6 smaller catchments. BMP, 1, 2, and 3 for a given catchment are assumed to operate in series, with the .Mows -1 serving es the inflow to 2, etc. If the outflow from en entire catchment (including outflow from selected BMP,) drains to pother BMP, indicate this in the drop duvet menu below the BMP type and leave all cells for individual lend uses blank. Notall BMP or catchmens must be utllized. Simply leave fields blank In the columns not eeded. Leave cells blank or inserc zeroes if a lend use is not present in the area draining to the BMP. Forwater harvesting BMPS, be sure to enter the percent volume reduction that will be achieved by your system. Volume detention (catch- and - release mechanisms) will not be nsidered - only proven volume reductions ere valid inputs. - Volume reduction efficiencies f,rundersized BMPS are calculated based on a 1:1 ratio (a BMPthat is G],%amaller than the required design size the assigned removal efficiency is 60%ofthi, standard efficiency value). Effluent concentrations remain the same esfull- ed BMP.. IMPORTANT: forthe land area calculation checks to occur, you MUST press enter after entering a value for area to be treated by a BMP (not just click o,the next cell). See User's Manual for instructions on modeling Oversized BMPS. III.MUdel Methudulugy(^' °,e detailed information in Uacra Manual) rnteatntinp Run II ia vemas — simple Method lever, 2007) - ifraction of impervious assigned to each land use based on literature review end field exploration. - Arunoff coefficient, Rv, is rolculated for each lend use using the designated impervious c over fractions. The total volume of runoff le then calculated based on the lend use area, Rv, end the precipitation depth of the water quality event. - Curcuroting Parfutont Laodfngs - Simple Method (CWP, 2007) - An event mean concentration of TN and TP is assigned for each land use type based on an extensive literature review. - The total load of a given pollutant for a defined drainage area is calculated based on the averegeannual rainfall depth, the runoff coefficient RV, and the representative event mean concenttation value. - The fraction of rainfall events that produce runoff is assumed to be 1.0. BMA Removal Calculations - EachBMP is assigned a representative event eon a on for the treated outflow leaving the system, as well as percentegestoftinflow that leave the system es infiltration, evapotranspiration, overflow and outflow. - The total mass of pollutant leaving the BMP is calculated using the following equation: Massaa - (EMCeu,nm,'VOlumeeuniez) + (EMCiarie,.,'VOlumeaiev) - The percent mass removal achieved by the BMP system is calculated using the following equation: %Removal = ((EMCi,aiw,'VOlumei,aim„)- Massa, aH:(EMCi,aim„'VOlumei,aim„)"100 Watershed Characteristics Ver2.0 Clear All Values J I Return to Instructions Proceed to BMP Characteristics Skip to Development Summary i Instructions 1. Selectyour physiographic /geologic region. (see map on 'instructions' page) 2. Enterthe area of the entire development in square feet (ft'). 3. Selectthe location that is most representative of the site's precipitation characteristics. (see map on 'instructions' page) 4. For each applicable land use, enterthe total area of that land use that lies within the development under pre - development conditions. 5. For each applicable land use, enterthe total area of that land use that lies within the development under post - development conditions, before BMP implementation. 6. Ensure that the sum of pre- and post - development areas entered equal the orginal development area. 7. Continue to "BMP Characteristics'' tab. Additional Guidelines - For non - residential watersheds, indicate acreages of each land use type in Column 1 for both pre- and post - development conditions. - For residential watersheds, complete the required information in Column 2 for both pre- and post - development conditions. - If a given land use is not present in the given watershed, leave the cell blank or enter a zero. - Ensure that land use areas entered for both pre- and post - development conditions match the total development area entered in cell 021. - Residential areas may be entered by average lot size (column, part A), or may be separated into individual land uses (column 2, part B) - -do NOT list out individual land uses within an area already described by lot size. - Unless runoffflowing onto the developmentfrom offsite is routed separately around orthrough the site, the offsite catchment area draining in must be included in the acreage values of the appropriate land use(s) and treated. Physiographic /Geologic Region: Piedmont Soil Hydrologic Group C Precipitation location: Raleigh COLUMN 1 -- NON- RESIDENTIAL LAND USES 1,002,417 Development Name: TN EMC mg/L) TP EMC (mg/L) Pre- Development (ft2) Post - Development (ft) COMMERCIAL Parking lot 1.44 0.16 X -ac lots Roof 1.05 0.15 Open /Landscaped 2.24 0.44 INDUSTRIAL Parking lot 1.44 0.39 Y, -ac lots Roof 1.05 0.15 Open /Landscaped 2.24 0.44 TRANSPORTATION High Density (interstate, main) 3.67 0.43 2 -ac lots Low Density (secondary, feeder) 1 1.4 0.52 Rural 1 1.14 0.47 Sidewalk 1 1.4 1.16 PERVIOUS Managed pervious 3.06 0.59 Custom Lot Size 0.2 Unmanaged (pasture) 3.61 1.56 564,593 Forest 1.47 0.25 JURISDICTIONAL LANDS" Roadway Natural wetland 1.4 0.52 102,859 Riparian buffer 1.0 1.44 1.44 0.39 14,448 0.39 Open water Roof Sidewalk /Patio 1.08 1.4 0.15 1,200 1.16 LAND TAKEN UP BY BMPs 1.08 0.15 2.24 3.06 0.44 0.59 152,427 "Jurisdictional land uses are not included in nutrient /flow calculations. Total Development Area (ft'): 1,002,417 Development Name: Wilson Place Model Prepared By: BNK - Danny Howell, PE COLUMN 2 -- RESIDENTIAL LAND USES Custom LotSize (ac) Age (yrs) TN EMC (mg/L) TP EMC (mg/L) Pre- Development pt - Development PART A X -ac lots Y -ac lots Y, -ac lots 1 -ac lots 2 -ac lots Multi- family Town homes Custom Lot Size 0.2 New 2.04746 0.42888 564,593 PART B Roadway 1.4 0.52 102,859 Driveway Parking lot 1.0 1.44 1.44 0.39 14,448 0.39 Roof Sidewalk /Patio 1.08 1.4 0.15 1,200 1.16 34,350 Lawn Managed pervious Forest 2.24 3.06 0.44 0.59 152,427 1.47 0.25 865,391 Natural wetland" Riparian buffer" Open water" 121,378 115,717 LAND TAKEN UP BY BMPs 1.08 1 0.15 32,171 Total Development Area Entered (ft): 1,002,417 Total Pre - Development Calculated Area (ft): 1,002,417 Total Post - Development Calculated Area (ft): 1,002,417 BMP Ch—t.,Mks V-2.0 ........... ............. . ... ........ ...... .. ...... ..... . .......... .. ........ Imumi 11 MUM WATERSHED SUMMARY Ver2.0 REGION: Piedmont TOTAL DEVELOPMENT AREA (ft l): 1,002,417 — Pre Develapment Conditions Port Develapment Conditions Port Develapment w /BMPs Pert ant Im pervious (•r. 1 £% . 4% .4% Annual Runoff Volume (..f. 2L9933 1,389,061 1,98,396 Total Nitrogen EMC m g/4 196 1.76 1.26 Total Nitrogen Loading (Ib /e. /yn 0 99 7 49 49 Total Phosphorus EMC 0.28 0.50 0.22 Total Phosphorus Loading Ib /a. /yn 0.19 212 0.87 Percent DiHerenre Between: Pert ant Im pervious I, � Pre Dev. & Port D_ without BMP- - Develop, ant & t Port Develo m with BM PS Port Dev without BM PS & Port Dev with BMPs — 3. 0% nual Runoff -I.- e(r.f.� 53196 98196 -596 otal Nitrogen E.0 I. 9/4 2196 -13% -28% Total Nitrogen Loa ding(Ib /a. /yn 65596 90,6 -34% Total Phosphorus EMC (m g/4 77% -21% 55% Total Phosphorus-ding(Ib /ar /yn 1012% 357% 51% Wilson Place BMP VOLUME REDUCTIONS /EFFLUENT CONCENTRATIONS ga p —1 dlfferencevalueslndlctea decrease in runoff volum , pollutant mncentranon r pollutant loading snve valuesindicte --r *if trea g —r—1 parking lot, TP effl uent concept at- - 0.16 mp/L BMP SUMMARY Ver2.0 a etv r n tp Wat . s ea —r act. istics ae[vrn to am Pcn ar ac[. istics lRin[svm I enhment Outflow Nitrogen EMC(mg/y 109 - - - - - Ou enhment Outflow otal Nitragen(Ib /a./yn 460 - - - - - Penent Red -i-m Nitrogen -d 1, 42% - - - - - Canhment Outflow Phosphorus EMC (m g/4 0.155 - - - - - Can hm ant Outflow Total Phaspharus(Ib /a. /yn 0.656 - - - - - Penent Red -i- m Phosphorus Load 72% - - - - - /� MO Town of Morrisville Stormwater i Nutrient Offset Reporting Form i Project Name: The Woods at Fairbanks Designed By: Bass, Nixon & Kennedy, Inc. Town Project No.: 13- 80000002 Developed By: Standard Pacific Homes BMP Type: Wetpond ToM BMP ID: Watershed: Neuse Plan ID : Total Nutrient Analysis Area = 1,002417 S.F. r_ a) _ �.• F Enter Acerage here k) 1) m) n) Date: Nitrogen Phosphorus Pre-development TN-Export = 0.99lbs /ac. /yr Pre-development TP- Export= 0.19lbs /ac. /yr Post - development TN- Export Before BMP's = 7.49 lbs /ac. /yr Post - development TP- Export Before BMP's = 2.01 Ibs /ac. /yr Post-development TN-Export After BMP's = 4.94 lbs /ac./ r Post-development TP -Ex ort After BMP's = 0.87 lbs /ac./ r 1- Dataprovided from the Jord -/Fats Lake 8tohmwater N.tdont Load Accounting Tool -pat NUTRIENT OFFSET REQ Nitrogen Phosphorus Target TN- Export Rate o�romsmo) = 2.20 Ibs /ac. /yr Target TP- Export Rate (from SMO) = 0.82 Ibs /ac. /yr Maximun TN- Export Allowed without Offset ( *) = 50.63 Ibs /yr Maximun TP- Export Allowed without Offset (a * e)= 18.87 lbs /yr Computed TN- Export after Treatment ( *d) = 113.68 Ibs /yr Computed TP- Export after Treatment= 20.02 Ibs /yr TN- Export Requiring Offset Payment (g - fi = 63.05 Ibs /yr TP- Export Requiring Offset Payment (g -f)= 1.15 Ibs /yr # of Years requiring offset = 30 yrs # of Years requiring offset= 30 yrs Total pounds to be offset (h *) = 1,891.61 Ibs Total pounds to be offset= 34.52 Ibs CALCULATION OF OFFSET PAYMENT Nitrogen Phosphorus Total IN pounds to be offset O = 1891.61 Ibs /ac. /yr Total TP pounds to be offset= 34.52 Ibs /ac. /yr Current EEP rate (nse "N nse -Falls Lake rate) = $20.29 /Ib Current EEP rate (use 'Meuse - Falls Lake rate) _ $147.23 /Ib 80% of EEP rate q* 0. so) = $16.23 /Ib 80% of EEP rate = $117.78 /Ib TN- Export Offset Payment (k *1) = $30,704.67 TP- Export Offset Payment (g -f)= $4,065.73 2- hftpJ /portal.ncdmr.ore /web /eea /fe ,-sch,dal,, o) Total O set Pa ment Amount Required (Y-n = S34,770.39 Approved By: Oct -13 Town ofMoh i,,ilk Engineering Department 260 -B Town Hall Drive • Moh i,,ilk NC 27560 Tel (919) 463 -6200 • Fax (919) 468 -6011 BASS, NIXON & KENNEDY, INC., CONSULTING ENGINEERS 6310 CHAPEL HILL ROAD, SUITE 250, RALEIGH, NC 27607 PHONE 919.851.4422/800.354.1879 ■ FAX 919.851.8968 October 15, 2013 Town of Morrisville PO Box 166 Morrisville, NC 27560 Attn: Robert Patterson ■ ■11111 ■■ ■111 ■ ■■ ■111 ■111 ■111 11 ■ ■■ ■ ■111 ■11111■K 1 IwAI I I ■ ■11111111 ■ ■l�� � � ' 111 ■ ■ ■111 ■ 111 ■11111 ■11111111 ■111 ■ ■11111 ■1111111111 ■ ■11111■ ■111 ■ ■ ■■ ■1111111 111 ■111■ 111 ■11111 ■111 ■ 111111111 ■111■ Mr. Patterson: Bass, Nixon & Kennedy, Inc. (BNK) would like to submit the following request for "No Practical Alternative ", and request for Authorization Certificate from the Town of Morrisville for a (1) buffer /road crossing and (1) buffer /sanitary sewer crossing per Section 9.(A)(1) and (2) for our client /applicant, Standard Pacific Homes (StanPac). e /* yes s _PHRSEz / -t � � �q� •• � P v • go 2 ��; # . "G F� • s f , • ` A '�q � 4q tai • J f Je�`r,Py V i Email Danny. Howell @BNKinc.com Web www.BNKinc.com Page 1 of 3 The Woods at Fairbanks (BNK No. 03- 12191; ToM No. 13- 80000002/12 - 0009 -C) October 15, 2013 Section 9. Permits Procedures, Requirements, and Approvals A. Determination of No Practical Alternatives /Request for Authorization Certificate 1. We certify the following: a. There is an existing riparian buffer that bisects our site, as well as borders our site to the east, see plan above. Without impacts to the buffer there would be no means of road connectivity across the site. Also, without buffer impacts the site could not be sewered, since the existing sanitary sewer below our site is located in the existing buffer to the east of our site. The proposed impacts have been minimized to the extent possible and the culvert that was placed in the channel at the road crossing was artificially lowered to 8" below the existing stream bed to preserve aquatic life in the channel. b. Our proposed use, single - family residential, is ideal for this location, and matches the surrounding uses. Our zoning restricts us to a maximum of 58 -lots on the Morrisville portion of our property. We are proposing a total of 54 -lots in Morrisville and another 11 -lots on the Cary portion of the property, totaling 65 -lots. c. A 90% TSS wetpond is proposed as a best management practice to further offset any impacts to the buffer by reducing the total suspended solids and nutrients present in the effluent to further improve the water quality entering the buffer as well as detaining the flow over a longer period of time for the 1, 2 and 10 -year design storms. 2. Applicant Information: a. Standard Pacific Homes Attn: Gray Methven 1100 Perimeter Park Drive, Suite 112 Morrisville, NC 27560 (919) 465 -5900 b. The applicant requests Authorization Certificate to perform (1) buffer /road crossing and (1) buffer /sanitary sewer crossing to serve a 65 -lot single - family residential subdivision, as well as extend sewer to properties upstream of our property to prevent the need for an additional buffer crossing. c. The buffer /road crossing occurs just north of the extension of existing Fairbanks Road, and the buffer /sanitary sewer crossing occurs just downstream of the road crossing both of which are located in the Town of Morrisville /Cary. The Town of Cary has waived its rights to Morrisville for both stormwater management and buffer impacts. d. Please refer to the map above, as well as the impact maps attached to the end of this request for further details. e. A 50' wide right -of -way is required by the town of Morrisville to provide connectivity to the existing road infrastructure. A segmental retaining wall is being provided on the east side of the buffer /road crossing of Fairbanks Road to further reduce the impacts to the stream and the buffer. The proposed buffer /sanitary sewer crossing is being Email Danny. Howell @BNKinc.com Page 2 of 3 Web www.BNKinc.com The Woods at Fairbanks (BNK No. 03- 12191; ToM No. 13- 80000002/12 - 0009 -C) October 15, 2013 constructed at minimum depth to further reduce any disturbance to the buffer and stream. f. A 90% TSS wetpond is proposed as a best management practice to further offset any impacts to the buffer by reducing the total suspended solids and nutrients present in the effluent to further improve the water quality entering the buffer as well as detaining the flow over a longer period of time for the 1, 2 and 10 -year design storms. BNK and StanPac feel that this proposed project is justified in the minimal impacts to the riparian buffers to serve the infrastructure of a growing community. Very truly yours, IAb! CAI�G p ti9 SEAL Danny L. Howell, Jr., ®® 029993 Bass, Nixon & Kennedy, Inc. 1 Manager Project Mana er �'•. ® ® ®a ® ® ®® Email Danny. Howell @BNKinc.com Web www.BNKinc.com Fm- Page 3 of 3 I 50' NEUSE RIVER BUFFER (MEASURED FROM TOP OF BANK) / I MH -2 .0�J / —T \ IO20• 2pNE / NRe � I IMPACTS LEGEND ZONE 1 1,159 SF • ZONE 3 1,885 SF STREAM 162 SF STREAM 20 LF pq >W = D W �Z W Z s Z Z i W f � W y22 Z `Z S 0. r P�m 0 J �?� X 7 xRIM Z W W o Z aiF U10 0z6 N u oo LL_ Q V i3w� Y F 2 dl J O z S� m O Q U 2 W r o ~ a Q d z m a O w i a U 0 F N0 z o z z =, O a con w 3 0 Li 7 W 10 N F- °� Q N � r o 3 SHEET EX -1 BASS, NIXON & KENNEDY, INC., CONSULTING ENGINEERS 6310 CHAPEL HILL ROAD, SUITE 250, RALEIGH, NC 27607 919/851 -4422 ■ FAX 919/851 -8968 BNK @BNKinc.com SLOPE STABILIZATION CALCULATIONS THE WOODS AT FAIRBANKS 1540/1600 WILSON ROAD MORRISVILLE� NORTH CAROLINA 029993 PREPARED BY DANNY L. HOWELLO JR., PE BASSO NIXON & KENNEDY' INC. OCTOBER 159 2013 NORTH AMERICAN GREEN SLOPE STABILIZATION CALCULATIONS the Woods at Fairbanks October 15, 20 1: y North American Green ECMDS Version on Cum. Dist_ File Input Mode Specifications Run Options Help Density ENGLISH. IUSER PERMANENT 10/15/2013 02:40PMr Country ( United Stales SF State /Region North Carolina End (ft) 1 0 Slope Gradient = 2:1 City IRaleigh = I 75.95% Annual R Factor 275 Factor Total Slope Length (ft) 60 0 Protection Type Permanent P Protection Period (months) �- Beginning Month SC250 Reinf Vag (C= 0.0025) Adjusted R Value 1275• 60 Slope Gradient (H:1) 12 3 Soil Type I Clay >1 K Factor 10.1 Not to Scale Soil Loss Tolerance (in) 10.53 Reach Cum. Dist_ Material Vegetation Type Growth Habit Density ASL bare (in) ASL mat (in) 275 otal Slope Length (ft] SLT (in) SF Remarks Begin (ft) End (ft) 1 0 60 SC250 Reinf. Mix (Both Sod /Bunch) 75.95% 0.975 0.002 Factor 0.1 0.03 12.302 STABLE 2 3 160 0 160 1 1 Composite 1 110.97510.0021 0.002 North American Green ECMDS Version 4.3 - Slope Protection Design; utput o i File Input hAode Specification- Run UhtlOn Help NGLISH. JUSER PERMANENT W1512013 X02:30 PM ountry United States tale /Region North Carolina ity Raleigh J nnual R Factor 275 otal Slope Length (ft] 60 rotection Type IPeimanent rotection Period (months) End (ft) eginning Month 0 djusted R Value 275. lope Gradient (H:1] 12.5 oil Type Clay Factor 0.1 oil Loss Tolerance (in) 10.03 Slope Gradient = 2.5:1 60 0 C250 Reinf Vag (C= 0.0025) Not to Scale Reach Cum. Dist. Material Vegetation Type Growth Habit Density ASL bare (in) ASL mat (in) SILT (in) SF Remarks Begin (ft) End (ft) 1 0 160 SC250 Reinf. Mix (Both Sod /Bunch) 75.95% 0.819 0.002 0.03 14.656 STABLE 2 3 160 0 1 Composite 0.819 0.002 W North American Green ECMDS Version JW5ldPJJJJJLUfion put File Input Mode Specifications Run Options Help ENGLISH. JUSER PERMANENT 10/15/2013 0239 PM Country I United States �f State /Region IN orth Carolina Cum. Dist. Material Vegetation Type Growth Habit Slope Gradient = 3:1 City Raleigh ASL mat (in) Annual R Factor 1275 Total Slope Length (ft) 160 0 Protection Type Permanent Begin (ft] Protection Period (months) 1 Beginning Month SC250 Reinf Veg (C= 0.0025) Adjusted R Value 1275. 60 Slope Gradient (H:1) 3 0.697 Soil Type I Clay K Factor 10.1 Not to Scale Soil Loss Tolerance (in) 10.03 STABLE Reach Cum. Dist. Material Vegetation Type Growth Habit Density ASL bare (in) ASL mat (in) SILT (in) SF Remarks Begin (ft] End (ft) 1 0 60 SC250 Reinf. Mix (Both Sod /Bunch) 75.95% 0.697 0.002 0.03 17.209 STABLE 2 3 0 60 Composite 110.69710.0021 BASS, NIXON & KENNEDY, INC., CONSULTING ENGINEERS 6310 CHAPEL HILL ROAD, SUITE 250, RALEIGH, NC 27607 919/851 -4422 ■ FAX 919/851 -8968 BNK @BNKinc.com STORMWATER CALCULATIONS THE WOODS AT FAIRBANKS 1540/1600 WILSON ROAD GARY /MORRISVILLE, FORTH CAROLINA 029993 9 1 PRETARFW 8 V DANNY L, CIOWELL, JR., Prc=' BASS, Nixom & KE�'�m uDY, INC. MAY 207 2013 REVISED: NOVEMBER 129 2013 STORMWATER NARRATIVE I ) PROJECT SUMMARY BASS, NIXON & KENNEDY, INC., CONSULTING ENGINEERS 6310 CHAPEL IIIIIP.Ii, ROAD, SUITE 250, RALEIGH, NC 27607 PHONE 919.851.4422/800.354.1879 ■ FAX 919.851.8968 THE WOODS A,'111FAIRBANKS STORMWATER II\\IIA RRATIVE The existing 1,002,417 -sf project site consists of two parcels, one of which is located in Cary and the other in Morrisville. The Town of Cary and Morrisville have both agreed to allow Morrisville to review and approve the stormwater control measures for the entire project. A buffered, wet weather draw bisects the project, and creates three distinct drainage basins that exit this site at locations labeled: POI #1- Northwest POI #2: Wet Weather Draw POI #3: Southeast METHODOLOGY The following calculations will quantify the pre and post - developed outflows from this project. The methodology used will be the TR -55 method for runoff estimation, using the 1, 2 and 10 -year design storms. TR -55 Worksheet 3 was used to calculate the time of concentration (Tc) for the pre - development outflow. The TR -55 minimum Tc, 6- minutes, was used for the calculation of the post - development outflow. Investigation into the types of soils on this project site, per the USDA Wake County Soils Survey, indicates that they are Type C soils, and therefore the corresponding SCS Curve Numbers were used in this study. A proposed wet detention basin or wetpond, located just upstream of POI #2, shall be used to both detain the aforementioned design storms and treat 90% total suspended solids (TSS). The Town of Morrisville only requires 85% TSS removal; however a vegetated filter strip is required for an 85% TSS wetpond design per the DWQ Stormwater BMP Manual. Our site does not have enough available space for a filter strip, and therefore a 90% TSS wetpond design is an acceptable alternative per the BMP Manual. PRE - DEVELOPMENT CONDITIONS The existing project site is mostly wooded, with the exception of an existing house, barn and driveways, totaling 15,648 -sf of on -site impervious surface area. These existing impervious surface areas are located on a ridge, whose runoff is split between the drainage area to POI #1 and the drainage area to POI #2. No existing impervious surface area drains to POI #3. Email Danny.Howell @BNl(inc.com Page 1 of 2 Web www.BNKinc.com The Woods at Fairbanks (BNK No. 03- 12191; ToM No. 13- 80000002/12- 0009 -C) October 15, 2013 POST - DEVELOPMENT CONDITIONS The proposed project site is composed of a 65 -lot single - family residential subdivision, with associated infrastructure. All of the lots were designed to have a maximum proposed impervious surface area of 3,500 -sf. All of the existing on -site impervious surface areas are scheduled to be removed, which means 7,824 -sf of impervious surface area that used to drain to POI #1, and 7,824 -sf of impervious surface area that used to drain to POI #2, no longer drain to those basins. This would account for the impervious surface area associated with approximately two developed lots for both POI #1 and #2. This is important because it is difficult to convey some the runoff from the proposed impervious surfaces located on lots below the proposed road grades, and those lots that do not naturally drain to the proposed wetpond. Our original design option for conveying stormwater runoff from the lots below the proposed road grades, adjacent to the buffer, was to capture the water in swales along the rear of the properties that would then be directed to the proposed wetpond. This option gave cause for concern for cutting off the water supply of the existing buffered wet weather draw that could prove harmful to its ecosystem. Our current design to convey the runoff to the proposed wetpond from the proposed impervious surface areas of the lots adjacent to the buffer, (Lots 3 - 5, 7 -11, 18 - 22, and 25 -32), focuses on capturing and treating the drainage from the proposed houses, which makes up a majority of the proposed lots' impervious surface areas. This was accomplished by providing a plastic storm pipe in a 10 -ft wide Private Drainage Easement at the rear of these lots along the entire buffer. A service clean -out is to be provided on the downstream side of each of these lots, for which the roof leaders from these houses will be connected. Please note that the rear of the houses on Lots 1, 2 and 13, and the entire house on Lot 23, approximately 1,088 -sf and 2,380 -sf, respectively, are not collected and drain to the buffer, bypassing the wetpond. Again, these bypassed impervious surface areas are accounted for with the removed existing impervious surface areas to POI #2. Email Danny.Howell @BNI<inc.com Page 2 of 2 Web www.BNI<inc.com STORMWATER RUNOFF 10 -YR PIPE SIZING 10 -YR HGL PROFILES 25 -YR HGL PROFILES 2 -YR VELOCITY CALCULATIONS GUTTER SPREAD CALCULATIONS ROOF DRAINAGE CALCULATIONS IGNA14NF-R, ALCULAii HUNS RIP -RAP CALCULA a DONS CULVERT CA, LCU LAii INNS (2� 10 & 25 -YR) Y W r J � � N � � N LL U r � � r 7 o o p co \° 0 d w O O O O r O r LO O N O O O O O r r 0 M O O O O O N O w N O 0 0 0 0 0 LO N r O O (O O I� I` d' O (O I-- N O O O O (.O N w w 00 O O _O. CV M I` I` O I` 00 N I` r- ti ti I-- Il- 00 O r- I-- I` rl- N O ti LO I- I` O I- N O w I- (O d' M r- I` I` CM (O M N r O O Q. 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N I- (M M d7 (p M O O O M M W Ln U) M N M 't M LL') m (M N CM O O Ln d) (fl CM 0) (fl C(M Ln M d• Ln d' Lo � d- •et d' O U7 Lo M M M M Ln M U) Ln M M M 't �' U7 In Ln M U) 'fit d' Ln d' Ln U) Ln Ln Ln LL') Ln Ln Ln Ln Ln Ln U') tt d' Ln Ln Ln Ln Ln Ln Ln U) Ln Oco C 00 I-- LO ti I,- I- ti O M I-- ti I-- I-- I'- I` O M (D U) U) O I-- l'- 0) O M ti CD CD 0 CD (p (D (0 (D fl- I` 0 0 0 0 Cl 0 0 0 I` I` (fl M O O O M O O 0 (D I- O co I` I` 0 0 0 0 0 0 I-- Ln (D M r- � O (M M co O co I` co CD (D 0 M 0 I- O 0 0 0 CO (fl (fl 0 O 0 M LC) 0 d• CD 0 0 0 M O M 0 CM 0 O 7 U 0 0 0 O O O O O O CD O CD CD CD C D C D C7 C D O C D C D 6 O CD C) CD CD C D C) C D O C D C) CD CD (D CD C D C D C7 O CD CD O O C D O C D C7 C D CD C7 O C D CD CD CD CD Cj CD V � p (O t 00 Ln CV d' M CM CD r O d7 r co O co O ti (` �' (M co d' co �}' (p N O M O (p r O O O d' r (M LO O O r (M (p N r 00 co co N N r I� (p M O 14: d M O O O O M r M d' N CM O N M Ln O M Cp r V N O d' N O O Cp N Ln M Cp N N O O N N Ln M r co I` M 4 co I` N CD N N N r r O f I` , W, r 0 �F d' It r O O r c- r r CD r r 0 CD 0 CD -- O O O O r r- CD O O O O O r O I� N Ln tY O O M r �- � O N O Q d V cn m C LO Lo 0 6 CM 0 0 (M v r O 0 0 M r O CD r O M 0 O r OI- d; r M r d N O M f� LL) r r M O M r M LO r O O r M It r 0 0 0 r CD CD r r M I` O O O M O O co N M N co co LO m co O co LO U) co 'IT r r N O O N O M M N N M t N N M t N r U O r r O M r r r r W r N O O N O r �' O O N N I,- N ` r O O O O O O O CD O O O r CD 0 0 0 CD 0 0 CD O O O O O O O O O O O O O O O O O O O O O O O O N O M O r 0 C) ti � Q O E Z O J 4+ C S r r r N N N M M m 4 Ln M M Lo I` I� O O CM O , (D O r r .t N N LO M r , r r N� � Cp I� I� 00 00 N r r r O (M O O O N( c1' Lo M Lo O a) N N N N N N N N N N N r r M t d° CO (D O (M O LO N (M M M M M M M M M M d' M "t , � d LO tt W r d r O I` O N LO r LO N LO d' O Lo LO I` I-- O Ln Ln 11) ti Ln J O (p � r r r r r �- r N N r N M d' Ln (p I` O (M O N N N N N N N N N M r M N M 4 6 CD I� O O O r N M� M M M M M M 6 CD I� 00 (M O r N M Ln I� CO CM X O r� O co M �t 4"T d' 't �t 't V' d' Lo LO LO LO LO U) M L() W (D M 13 Z CL N < x U) W M Y J r cco�N L W N IUr r U)� o O O 4) co i N Line ID TolalRunoff (cfs) QCarryover (cfs) QCaptured (cfs) QBypass (cfs) GutterSlope (fUfl) GutlerSpread (ft) 1.2-1.1 35.84 2 -1 23.8 0.2 0.35 0 0.05 2.35 3 -2 7.68 0 0.28 0 Sag 3.33 4 -3 0.59 0.04 0.63 0 Sag 0.67 5 -3 7 0 0.12 0 0.05 1.47 6 -5 0.46 .... .... .... .... .... 7 -5 6.53 0 0.31 0 0.05 2.15 8 -7 6.26 0.54 0.62 0.02 0.05 3.40 9 -8 6.19 0.32 0.57 0.06 0.02 4.25 10 -9 2.15 0.59 1.27 0.48 0.02 6.80 11 -10 1.1 0 0.39 0 0.05 2.55 12 -14 1.25 .... 14 -2 3.82 15 -2 14.49 0 1.1 0.2 0.05 4.85 16 -15 13.54 0.29 0.63 0.03 0.05 3.45 17 -16 13.31 0 0.31 0 0.02 2.90 18 -17 13.1 0 0.73 0.13 0.02 4.95 19 -18 1.2 0 1.04 0416 0.05 4.70 20 -18 11.7 0.06 0.38 0 0.05 2.45 20.1 -20 2.42 21 -20 0.34 0 0.34 0 0.05 2.30 22 -20 9.45 0.43 0.77 0.06 0.05 3.90 23 -22 9.19 0 0.75 0.06 0.05 3.85 24 -23 8.57 0 1.35 0.35 0.05 5.50 25 -24 3.62 .... .... .... .... 26 -25 0.97 .... .... 27 -26 1.01 .... .... .... 28 -25 3.02 .... .... .... .... 29 -28 2.34 30 -29 2.36 31 -24 3.85 0 0.6 0.02 0.05 3.35 32 -31 0.4 0 0.4 0 0.05 2.55 33 -31 3.15 0.02 0.31 0 0.05 2.15 34 -33 2.94 0 0.6 0.02 0.05 3.35 35 -34 147 0 0.18 0 0.05 1.72 36 -34 0.98 0 0.16 0 0.015 2.05 37 -36 0.7 0 0.61 0.09 0.015 4.80 38 -36 0.29 0 0.29 0 0.015 3.05 39 -30 2441 0 0.87 0.06 0.07 3.80 40 -39 1.5 0 0.85 0.06 0.07 3.75 41 -40 0.6 42 -35 1.55 .... .... 43 -42 1.02 0.09 1.1 0 Sag 0.58 44 -9 3.99 0 0.82 0.32 0.02 6.20 45 -44 2.89 0 0.46 0.06 0.05 3.90 46 -45 2.37 0 0.88 0.27 0.05 5.25 47 -46 1.25 0 0.99 0.26 0.02 5.90 48 -11 0.76 0 0.03 0 0.05 0.87 49 -48 0.74 50 -27 1.05 0 0.26 0 0.05 1.95 51 -50 0.82 0 0.24 0 0.05 1.90 52 -51 0.63 0 0.26 0 0.08 1.80 53 -52 0.38 0 0.38 0 0.08 2.15 55 -54 42.16 .... 57 -56 13.93 58-57 8.21 .... 59 -57 4.34 EX -59 4.34 .... .... 60 -57 1.74 0 0.79 1 0 Sag 0.08 61 -60 0.97 0 0.97 1 0 Sag 0.08 The Woods at Fairbanks GUTTER SPREAD (4 [PH) 10/15/2013 (1) z 0 D U J Q U W a E w C� z LL 0 w o c^n M O o 0 0 0 0 0 V rn O Cm- { o 0 0 0 O O 5 O 2 V \ (n (n U) U) O Z U N N N O O (Q O O N O ao Op O O N N biO O 00 O r- O 0) 00 00 O 0) LO •- M cO N N o (U c cl r- �- C - o O (D O O O T �- Qz C 0 v- O U ^ E d O II II II 11 II II II II II d' o (0 d' (0 oo O N 0) �- (Y) c>7 11 (O (Y) LO O (Y) U O O U ... ❑ am o i` N CO o Co O r CL r N r CV r ('7 r ('� �-- co r d' �- d- CO I� 00 dj O r o r o (n I-- O a 0 I` O O d' OD N O o c^n M O o 0 0 0 0 0 V rn O O o 0 0 0 U^ O O O N N N O O (Q O O LO O ao Op O O N N (0 00 � i- �- r �- Qz C U ^ E d O �. d' I� o �- O N .- W O d' o (0 d' (0 oo O N 0) �- (Y) c>7 11 (O (Y) LO O (Y) O o O O U ... ❑ d' Lo o i` N CO o Co O r r r N r CV r ('7 r ('� �-- co r d' �- d- CO I� 00 dj O r o r o (n I-- O N I` O O d' OD N O U) O0') (0 O O�� N � M 1� r d, 00 d' OD O 00 N LO 00 O O N CD o �- N N N cO (O cO d' d' d' o 0 0 c- N ^ M e- (O c (0 c M c- (O r' (O r (O r M Oo co OD CO OD M U O c- <- N N (Y) M d' d; O O O O I,- o o N N cO a a O CJ C7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ❑ (L �. o 0 0 �� o ((� o (c� o rn (c� (0 o d' (n o rn O O o o O o O rn o LO d' U 00 (o d rn d O (D d 00 �- o r M LO r 1-- co o rn d N O N d' CO I� (� r (Y ((i OO O N d' (O a0 r O I` O O N d' ❑`' N d. w r r r N N N N N cO �- rS O I �- (1) 0. w a U) O 2 (' r N cO d' O (0 1- co rn O 1 N c') d' r N co dq ui (o I� LL Z z o� z ❑ 0 z O O 1` W M O N �- O N o O 00 (.. (� d O (� oD N N N N N CO (Y) M N (\I N �- O J tU U) M_ N C O C N LL U o c� U) 0 0 a� s (n (n co O O N fl Q LO LL p 1 U) ,Q- 'a O O N .0 CO ih m co N (n ' 1 (n U) U7 U) �`,' cororom 0000) t CL N N N N t 4a 1i 0) d C'4 c0 i ^ ' 00 Lo v N C r N J o N rn- ON 4f 00 00 00 00 V O N o O s- LO LO w W W W IL (>I�f CHANNEL A SF AC I Imp SF I Imp AC I:> 'I1,:01 CULVERT 0,0U 0.08 _ 0% 8% DA O/S SF 1,020,330 111,592 AC jlmpSF 23.42 340,596 2.56 0 Imp AC 7.82 0.00 % 33% 0% *LOTS 159,769 3.67 33,121 0.76 21% OFF 727,651 16.70 291,060 6.68 40% (>I�f CHANNEL A SF AC I Imp SF I Imp AC I:> 'I1,:01 0. ^0 U 0,0U 0.08 _ 0% 8% 39,979 0.92 3,360 279,320 6.41 111,728 2.56 40 %. CHANNEL B T SF AC Imp SF Imp AC % '14,884 0.34 0 0.00 0% *LOTS 34,997 0.80 17,500 0.40 50% Culvert - Channel Summary 10/14/2013 Culvert Report Hydraflow Express Extension for Autodeske AutoCAD® Civil 3D® by Autodesk, Inc. Tuesday, Nov 12 2013 Fairbanks Road Crossing (48in Culvert - 2 -YR) Invert Elev Dn (ft) = 367.60 Calculations Pipe Length (ft) = 115.68 Qmin (cfs) = 60.36 Slope ( %) = 2.96 Qmax (cfs) = 85.83 Invert Elev Up (ft) = 371.02 Tailwater Elev (ft) = (dc +D) /2 Rise (in) = 48.0 Shape = Circular Highlighted Span (in) = 48.0 Qtotal (cfs) = 60.36 No. Barrels = 1 Qpipe (cfs) = 60.36 n -Value = 0.013 Qovertop (cfs) = 0.00 Culvert Type = Circular Concrete Veloc Dn (ft/s) = 5.65 Culvert Entrance = Groove end projecting (C) Veloc Up (ft/s) = 7.91 Coeff. K,M,c,Y,k = 0.0045, 2, 0.0317, 0.69, 0.2 HGL Dn (ft) = 370.77 HGL Up (ft) = 373.36 Embankment Hw Elev (ft) = 374.38 Top Elevation (ft) = 395.00 Hw /D (ft) = 0.84 Top Width (ft) = 60.00 Flow Regime = Inlet Control Crest Width (ft) = 120.00 Elev (ft) 397.00 392.00 387.00 382.00 377.00 372.00 367.00 362.00 Fairbanks Road Crossing (48in Culvert - 2 -YR) Hw Depth (fl) 25.98 20.98 15.98 10.98 6.98 0.98 -4.02 -9.02 Reach (fl) Circular Culvert HGL Embank Culvert Report Hydraflow Express Extension for Autodesk® AutoCADO Civil 3D® by Autodesk, Inc. Tuesday, Nov 12 2013 Fairbanks Road Crossing (48in Culvert - 10 -YR) Invert Elev Dn (ft) = 367.60 Calculations Pipe Length (ft) = 115.68 Qmin (cfs) = 75.67 Slope ( %) = 2.96 Qmax (cfs) = 75.67 Invert Elev Up (ft) = 371.02 Tailwater Elev (ft) = (dc +D) /2 Rise (in) = 48.0 Shape = Circular Highlighted Span (in) = 48.0 Qtotal (cfs) = 75.67 No. Barrels = 1 Qpipe (cfs) = 75.67 n -Value = 0.013 Qovertop (cfs) = 0.00 Culvert Type = Circular Concrete Veloc Dn (ft/s) = 6.80 Culvert Entrance = Groove end projecting (C) Veloc Up (ft/s) = 8.64 Coeff. K,M,c,Y,k = 0.0045, 2, 0.0317, 0.69, 0.2 HGL Dn (ft) = 370.92 HGL Up (ft) = 373.65 Embankment Hw Elev (ft) = 374.91 Top Elevation (ft) = 395.00 Hw /D (ft) = 0.97 Top Width (ft) = 60.00 Flow Regime = Inlet Control Crest Width (ft) = 120.00 392.00 387.00 38200 377.00 372.00 367.00 Fairbanks Road Crossing (48in Culvert - 10 -YR) Emil --MEMEMEMME 362.00 0 VCircular Culvert HGL w V Embank H,v Depth (fl) 25.98 20.98 15.98 10.98 6.98 0.98 -4.02 -9.02 00 110 120 130 140 160 160 Reach (e) Culvert Report Hydraflow Express Extension for Autodesk® AutoCADO Civil 3D0 by Autodesk, Inc. Tuesday, Nov 12 2013 Fairbanks Road Crossing (48in Culvert - 25 -YR) Invert Elev Dn (ft) = 367.60 Calculations Pipe Length (ft) = 115.68 Qmin (cfs) = 85.83 Slope ( %) = 2.96 Qmax (cfs) = 85.83 Invert Elev Up (ft) = 371.02 Tailwater Elev (ft) = (dc +D) /2 Rise (in) = 48.0 Shape = Circular Highlighted Span (in) = 48.0 Qtotal (cfs) = 85.83 No. Barrels = 1 Qpipe (cfs) = 85.83 n -Value = 0.013 Qovertop (cfs) = 0.00 Culvert Type = Circular Concrete Veloc Dn (ft/s) = 7.53 Culvert Entrance = Groove end projecting (C) Veloc Up (ft/s) = 9.11 Coeff. K,M,c,Y,k = 0.0045, 2, 0.0317, 0.69, 0.2 HGL Dn (ft) = 371.00 HGL Up (ft) = 373.83 Embankment Hw Elev (ft) = 375.27 Top Elevation (ft) = 395.00 Hw /D (ft) = 1.06 Top Width (ft) = 60.00 Flow Regime = Inlet Control Crest Width (ft) = 120.00 Elev (fl) 397.00 392.00 387.00 382.00 377.00 372.00 367.00 362.00 Fairbanks Road Crossing (48in Culvert - 25 -YR) Hw Depth (ft) 25.98 20.98 Circularculvert HGL Embank 15.98 10.98 6.98 0.98 -4.02 -9.02 Reach (ft) NITROGEN /PHOSPHORUS EXPORT NUTRIENT LOAD ACCOUNTING SPREADSHEETS TOM BUY -DOWN CALCULATION The Woods at Fairbanks November 12 2013 W a. 0) y n m o d' f1 Z O O C O U co X z LO (D N N E m 6 z a) N at N N CL O p r N � N 0 co 4- I-- vi c 0 7 u tU u D G C Ti 2i 7 u G 0 r- at N 7 U C 10 H a N O O ei R, v v v c w v Q r Ol E CL 0 al H IN to d v u u G Ol E 0 v ❑ a N F H et N O N I to 4 a w A u r G E a }b W O a° r F - m rn, in a I t- [o iu O� dl �� in I '1 ry h7 in rl H H • _ _ I I � Y at E , o H m Do . d, Q 1.. O o N [n m in H • n- W •� H to N } i 00 H , W v ❑ u i w p I I I I I [co Nt N to of nr, Ol to Ifl -t 1D rt H H' Ol to in N I I 1 I[1 E I I I Ci O O rl d o 0 O - — .el u J w I I I I I I I to �t � E r4 .-i uj to LLI r C at I I I I I I I I I 1 1 Z - - - -- — — — - -- — O CJ E ti� O U in 3 D o 11 H in N In O ID Iv r C _N i1 pr 7 IL r �- m b o 'o 0 0 `I� L E io °p ' w m y w c m C M (p N N N 7 O I, O �I ID O� ID to O o L❑ u Ix a cc N L u- o[ O z vi c 0 7 u tU u D G C Ti 2i 7 u G 0 r- at N 7 U C 10 H a N O O ei R, v v v c w v Q r Ol E CL 0 al H IN to d v u u G Ol E 0 v ❑ a N F H et N O N I to 4 a w A u r G E a }b W O a° r F Type of BMP: If BMP is undersized, indicate the BMP's size relative to the design size required to capture the designated water quality depth 0 -e. 0 -75 = BMP is 757. of required design size): "For water harvesting BMP, enter percent volume reduction in decimal form. Catchment 1: Catchment 2: Catchment 3: Catchment 4: Catchment 5: ,catchment 6: Drainage Area Land Use COMMERCIAL Parking lot _ Roof OpenlLandsoape INDUSTRIAL Parking lot Roof OpeniLandscape TRANSPORTATION High Density (inter Low Density (seoa Rural Sidewalk MISC. PERVIOUS Unmanaged tpasturej Forest feeder) !2 -ac lots (New) _ 2 -ac Iot_s (Built after 1995) 2 -ac lots (Built before 1995) 1 -ac lots (New) 1 -ac lots (Built after 1995) 1 -ac lots (Built before 1995) -ac lots-(New) iir\IPWI Wet Detention Pond CATCH M1J,11 1 BMP#1 BMP+ no ` no II no no no no no I no no no I no —I no no no no 'area treateul Area treated lu95 BMP #3 th -nri: Area Treated by BMP - 2 G:h—A by BMP U not kfi_ ri�4lri b:a' +� aF;:a I fftx] r y r3y',I ; i i � Forest 1IDENTIAL, 2-ao lots (New) 2-ao lots (Guilt after 1995) 2 -ao lots (Built before 1995) 1 -ao lots (New) 1-ao lots (Quilt after 1995) 1 -ao lots (Built before 1995) V -ao lots (New) -ao lots (Built after 1555) /;-ao lots (Efuilk before 1555) ri -ao lots (New- � ! /,-ao lots Guilt after 1995) ;i-,ao lots (Built before 1595) ,.,-ao lots (New) i-' -ao lots (Built after 1995) % -ao lots Guilt before 1995) Tow nhomes (New) Townhomes (Built after 1995) 'otitis nhomes (guilt before 1595) Multi- family, (New) Multi - family (Built after 1595) Mulki- family (Built before 1995) Custom Lot Size (New) Custom Lot Size (Built after 'I; b) Custom Lot Size (Built before 1595) Roadway Driveway Parking lot Goof Sidewalk Law n -- Managed pervic,,,.i:- -- Forest I,Ap.,in TAKEN UP BY BI' IP 'II II I -c ,AP. P. R6�; ��?� II'(Ill �f�, II L nl II_I °'u'`' II-j6',ill ' ilia dli C iili � . dh 'I'll I�•II ..,.D . , I If � , , 116 {i� '., � II•I�.•.p it 111i'u` II .I. I III i; I0i 1j:' '.p I 407,050 I 110,929 24,797 02 r 1 32,171 67 20,848 ICI ii11 c 0 N O v } Q N O W S LL' J 0 CL In- t I� da r I- r N N I .`� oN I O \ o -n m o c, o N ! �� r o cJ r c^> 0 0 a C a w U s 2 7 2 is o w o w p J 01�C nl pr u s 0-0 o v n i l IA c ZE 5° rl A z"'a 0 3 3 '� r r° � I e ^� v O J 9 o v{ a 3 7 r; r'. c� 7 1 �1i d! N N w ,D m L{ �,7�o Os ej a HI o o o o IA a °{ E E 0 0 '� I a 9 c a w e e �} d u y d EI ii '0 c El o col. w u= w� niouut fL'b 00':iOa,Uf/�l }I f7 JIL m aa, of 7 xs 00 > I r I- r N N I .`� oN I O \ o -n m o c, o N ! �� r o cJ r c^> 0 0 a C a w U s 2 7 2 is o w o w p J 01�C nl pr u s 0-0 o v n i l IA c ZE 5° rl A z"'a 0 3 3 '� r r° � I e ^� v O J 9 o v{ a 3 7 r; r'. c� 7 1 �1i d! N N m L{ �,7�o Os ej a HI IA a °{ El vl c? } } o�l I I e `9 NI a o 0 13 16 A; 51 , \' x, \,�s ^le aol l N: of al I o I I i i6 Ic ..I I ^I �n I:41till IwIE 9911 Imo. �I 9( 9 : � `lo a wy��^ J Ho q 0 l ° u E�iol�l6!'3 9 Ip'� a'¢It°- 13iolaf � z Ir r Fi V� � � ] $ §d/ /20 @ \ k z # / � Nof 2 � \ % \ \ Q 9 Is \ [ ( / / \ / �§ K ( 3 \ ? a ®- \\/} a\]! !) S! §} ! )\ / \k \ u t )} � \ \}§§ § 2 \ \ / 0j §' § F. �2 /\ 7 , \ x 7 e 2 � \ % \ \ Q 9 Is \ [ ( / / \ / �§ K ( 3 \ ? a ®- \\/} a\]! !) S! §} ! D CALCULATIONS STORMWATER RUNOFF SUMMARY PRE V. POST (1 v 2 & 10 -YEAR) 1 "/1.5" WQV WETPOND CALCULATIONS 15 25 105 255 50 & 100 -YEAR ROUTING CALCULATIONS NCDENR WETPOND SUPPLEMENT FORM POI #2/WET WEATHER DRAW EXISITNG SF I AC Irr SF Im AC Site 1,002,417 2.81 7,824 0.18 60/o Imp 15,648 El 0.36 1 1000 Per 986,769 1 22.65 0 1 0.00 1 0% POI #2/WET WEATHER DRAW POI #1 SF AC I Im SF I Imp AC % D. 122,402 2.81 7,824 0.18 60/o Imp 7,824 0.18 7,824 1 0.18 100% Per 114,578 2.63 0 0.00 0% POI #2/WET WEATHER DRAW SF I AC-1 Im SF Im AC % D. 853,124 Imp 7,824 0.18 7,824 0.18 100% Per 845,300 19.41 0 0.00 0% ( *LOT IMPERVIOUS BASED ON 3500 SF /L07) PROPOSED POI #3 "LOTS 1 564,893 12.97 1 SF I AC Im SF Im AC % SF AC lrnQ SF ImQ AC % 30,263 0.69 3,586 0.08 12,489 0.29 0 0.00 0 °/u `LOTS 15,828 0.36 2,009 0.05 13% Imp 0 0.00 0 0.00 0% Per 26,891 0.62 0 0.00 0% ( *LOT IMPERVIOUS BASED ON 3500 SF /L07) PROPOSED SF I = Imu SF I Imp Al Site 1,002,417 015 1 265,775 1 6.10 1 0 1 0.00 0% "LOTS 1 564,893 12.97 1 227,500 5.22 40% SF 672,848 79,104 P01#1 SF AC lrnQ SF ImQ AC % 30,263 0.69 3,586 0.08 12,489 0.29 0 0.00 0 °/u `LOTS 15,828 0.36 2,009 0.05 13% 9.34 POI #2NWET WEATHER DRAW SF AC Inig SF Im AC D" 956,866 O/S 1 247,301 1 5.68 0 0.00 0% 'LOTS 540,512 12.41 222,250 5.10 41% POI #3 SF I AC I Imp SF Im AC D, O/S 1 5,985 0.14 0' 0% "LOTS 1 8,553 1 0.20 1 1,170 1 0.03 1 14% SUMMARY EXISTING WETPOND 02 (CFS) Q10 (CFS) DA O/S SF 672,848 79,104 AC Imo SF 15.45 340,862 1.82 0 Im AC 7.83 0.00 51% 0% "LOTS 407,050 9.34 197,402 4.53 48% OFF 17,641 0.40 8,335 0.19 1 47% POI #3 SF I AC I Imp SF Im AC D, O/S 1 5,985 0.14 0' 0% "LOTS 1 8,553 1 0.20 1 1,170 1 0.03 1 14% SUMMARY EXISTING Q1 (CFS) 02 (CFS) Q10 (CFS) POI 111 2.89 4.41 9.55 POI #2 16.40 25,93 59.20 P01 #3 0.53 0.84 1.91 PROPOSED Qi (CFS) Q2 (CFS) Q10 (CFS) POI #1 1.29 1.82 3.50 POI 112 52.25 70.44 126.77 F`01#3 0.52 0.75 1.53 DET(REQ -D) POI 111 Q1(CFS) -1.6 Q2(CFS) -2,59 Q10(CFS) -6.05 POI #2 I 113 36.85 -0.01 -0.09 0.38 ETPOND Qi (CFS) Q2 (CFS) Q10 (CFS) !INFLOW 43.96 57.33 97.62 UTFLOW 2.62 11.59 29.69 DET (PROS DET (NET) 41.34 .5.49 45.74 -1.23 0,30 STORMWATER RUNOFF SUMMARY 10/14/2013 PRE V. POST (1, 2 & 1O -YEAR c� it F PRE >i�lx:at Reach on Link R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - PRE Prepared by BASS, NIXON & KENNEDY, INC. Page 2 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:41 PM Project Notes The Woods at Fairbanks Danny L. Howell, Jr., P.E. These calculations will quantify the pre - developed outflows from this property. The methodology used will be the TR -55 method for runoff estimation, using the 1, 2 and 10 year storms as the test storms. Investigation into the types of soils on this site (USDA Wake County Soils Survey) indicates that they are Type C Soils, therefore Curve Numbers corresponding with Type C soils are used in this study. The TR -55 method (Worksheet 3) was used to calculate the time of concentration. R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - PRE Type// 24 -hr 1 -YR Rainfall= 3.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 3 HydroCAD ®8 00 s/n 004300 0 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:41 PM Subcatchment POI #1: PRE Runoff = 2.89 cfs @ 12.07 hrs, Volume= 0,169 af, Depth> 0.72" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 -YR Rainfall= 3.00" Area (sf) CN Description 7,824 98 Paved parking & roofs 114.578 70 Woods, Good HSG C 122,402 72 Weighted Average 114,578 Pervious Area 7,824 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft /ft) (ft/sec) (cfs) 13.2 Direct Entry, TR55 Subcatchment POI #1: PRE Hydrograph 1 I 1 I 1 I I I 1 I I 1 I .-- -I- - - -- -� -- -�- I-- - - --- _I -- -- 1- - - - -1- 1 I I I 1 I 3-' I 1 I I I I I I I I I I I I 2.69 cs I I 1 I I I I I TYPO I I 11 I1 I 11 "�I � I I 1 I I I I I I I I I I I I I I R a rriifaI1 3. l?, �l °� I I I I I I I I I I I I RUnoff Arta =122,1 Sf I �I RufiofF Vol :um6=0A 65 of N i i i i i i i Y"`ulviiof PJ G LII II ��o / /IL ao O 1 I I I I I I I To-1 1 eI h 2 q I r I 1 I I 1 I I I I I I I Ip� I I I 1 1 1 I I I I I 1 I 1 I I I I I I 1 I 1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I I I I I I 1 1 I I I I I 1 I I I I 1 I 1 I I I I I I 1 1 1 I I I I I I I 1 I 10 11 12 13 14 15 16 17 18 19 20 Thne (hours) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - PRE Type// 24 -hr 1 -YR Rainfall= 3.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 4 HydroCAD ®8 00 s/n 004300 0 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:41 PM Subcatchment POI #2: PRE Runoff = 16.40 cfs @ 12.08 hrs, Volume= 1.031 af, Depth> 0.63" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 -YR Rainfall = 3.0011 Area (sf) CN Description 7,824 98 Paved parking & roofs 845,300 70 Woods Good HSG C 853,124 70 Weighted Average 845,300 Pervious Area 7,824 15 =' Impervious Area Tc Length Slope Velocity Capacity Description in) (fP.PA (ft /ft) (ft/sec) (cfs) 14.4 Direct Entry, TR55 Subcatchment POI #2: PRE Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) -- - - - - =-- - - - - -- -- - - - - -- - - -- - -- - - -- - - -- '--- '----- '--- - - I - - - - ■ Runo(f 18 -' - - - - - -- --- -' - - -- ---- - - - - -� --- -I - - -- ---- -' - - -- - - I 1 1 I I 1 1 I I 17- 1 1 1 1 1 1 1 1 I I 18.40 cfa t I I I 1 1 16: ------- r---- ,---- T---- 1- - - -� -- ---- ,--- -r - - --Ypp 15 =' I 1 1 1 I I 1 I I - -- t---- r---- r--- t------ - --I -- ---- I-- - -r- - -- --- RaiU�lfal�i 3olJ ®�a -- I 14' I 1 1 I I 1 :- Arta =853, 214,sf 13 =' ,__ -- - - -- -- - - - - -- ----- - - -� -- --- �Rdnofli� - 12-' I 1 ._ _ _ L _ _ RU�i Ov'u-- @/o= �; ®�11af -= 10= Run off I DeI 0:6I 3 -' ,• - -- - pth;>I '- ' 3 9 -' I ---=----- '---- '----- '-- - - -' -- --- '----=---- - - - -'- -' -� -'- _f - -- - -- ;- I i I 1 I I I I ' TG 144 a I—y g -•` 1 I I 1 I I I I 1 I ilin 7: ----- -L---- r---- I---- r---- r- - --1 -- --- I---- r---- r - - - -1- -- r--- �� ®r�O -- I I I 1 I I I I I I I I I I I I I 1 1 5:' I I I I I I - - + - - - -+ ---- 1---- +--- -1 - - -- + -- -- +- --- +--- - + - - -- - - - -� - -- +--- -� - - -- 1 -- 4 . I I 1 I 1 I I I - - _ J _ _ _ _ L _ _ _ _I _ _ _ _ 1 _ _ _ _ I_ ------ _ _I _ _ _ _ 1 _ _ _ _ L _ _ _ J _ _ _ -L.-- _ J _ _ _ _ 1 I I I I 3:. 1 I 1 I 1 I I I I I ___J____L____I____1____1____J_ L I____1____I____J 1 I I 1 I i I I I I I 1 1 1 I I I 1 1 1 I 1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - PRE Type 11 24 -hr 1 -YR Rainfall= 3.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 5 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:41 PM Subcatchment POI #3: PRE Runoff = 0.53 cfs @ 12.08 hrs, Volume= 0.032 af, Depth> 0.63" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 -YR Rainfall= 3.00" Area (sf) CN Description 26,891 70 Woods Good HSG C 26,891 Pervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.8 Direct Eni1y, H,155 (Worksheet 3) Subcatchnnc�n . P(4 ;3� PRE Hydrograph -- - - - - -� --- l - - - -� --- - - - -'- -- -------- ' - -- -L - - -- - -- 0.55' I I I i 0.53 cfs - 0.5 " - -- I---- r--- y- --- r----- - -I - -- --- r---- 1 - - - -: - . GainfaOY 3.00 - I 0.45-'' I I I I 1 I --- - - - -; - -- ; - - - -; - -- ; - - - -; -- - - -; -- Rfirro`��u Awea:`26- 91-sf- ; o.4 - ' . ------ ' I ' '--- -1 - - -- I - - - -� - -- I - - - -� -- ! - I - L --- ,Rur�off;�c�� ���nc��(�„ 32; of -- .—. 0.35- I I I 1 1 I I 1 I ' - -- - - - -� - -- - - - -� - -- - - - -� - - - -r - -- - Rurnofn- D(,T�i�;G� l) «3er- 0.3_' ,. � - -r -- - - - - -� - -- ' - - - -� - -- - �- '- h r- ' 1 - -- - -- - -- -- - -- - '1�3 Miirn I � I c� h� _ V' 0.25 y�� \I i, of 0.2- • I I I I I 1 I 1 I I I I 1 1 � I ' ' ' ' I I I 0.15 0.1 0.05- 5 6 7 D 9 10 11 12 13 14 15 16 17 18 19 Thne (hours) ■Runoff R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - PRE Type 11 24 -hr 2 -YR Rainfall = 3.60" Prepared by BASS, NIXON & KENNEDY, INC. Page 6 HydroCAD ®8 00 s/n 004300 0 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:41 PM Subcatchment POI #1: PRE Runoff = 4.41 cfs @ 12.06 hrs, Volume= 0.250 af, Depth> 1.07" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 2 -YR Rainfall = 3.6011 Area (sf) CN Description 7,824 98 Paved parking & roofs 114,578 70 Woods, Good HSG C 122,402 72 Weighted Average 114,578 Pervious Area 7,824 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft /ft) (ft/sec) (cfs) 13.2 Direct Entry, TR65 U 0 U. Subcatchment POI #1: PRE Hydrograph I I I I I I I I I I I I I I I I I I I I I I C 1 1 I I I I I I I I I 1 I I I I I I 4- I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 I 1 I I I I I 3 -'' I I I 1 1 I I I 1 I I I I I 1 1 I I I 1 I I I I I I I 1 I I I I I I 1 2- I I I I I I I 1 1 1 I I I I I 1 I I I I I I I I I I I 1 I 1 I I I I I I I I I 1 1 I I I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I I I I I I I I O Runof( I I I I I I I I I I I I I I I I I I I I kaifnI 'W ll 3A010 I I I I I I 1 RIIJInof 'ii' Arta =122,402;st I I I I I I I ---- ;Rungri;V ® gum - =x;250 :af- u' n®ff De;pth�1 .01'9 I I I I I I I I I I I I I I (I�9�7�? I I I I I I I I I I I I I I - - - -- I I I I I I I I 1 I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I 5 6 7 8 9 10 11 12 13 14 15 16 V 18 19 20 Thne (hours) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - PRE Type// 24 -hr 2 -YR Rainfall= 3.60" Prepared by BASS, NIXON & KENNEDY, INC. Page 7 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:41 PM Subcatchment POI #2: PRE Runoff = 25.93 cfs @ 12.08 hrs, Volume= 1.563 af, Depth> 0.96" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 2 -YR Rainfall = 3.6011 Area (sf) CN Description 7,824 98 Paved parking & roofs 845,300 70 Woods Good HSG C 853,124 70 Weighted Average 845,300 Pervious Area 7,824 20; Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 14.4 16 Direct Entry, TR5" Subcatchment POI #2: PRE Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) -'---' �---- f---- I----+---- I---- �--- -4---- I-- -- +---- I- -- -- I-- - -I--- - +- --- -I - - -- ■Runoff 28= -- I I I I I I I I I I I --'1----r----I----7---- I- -- -7- 25.93 cfs ---I----r----I----'1 --- -r-.- _ _t----r---- -- 1 I I I 24,' ,•- , I I --- �---- a----- I---- �---- 1- - - -� -- ---- ; - - - -; - - - -; --- I;Zaaf��u'�81� 3.50 - -- : 22: I I I I I I ____I 1 1 ____I , - T— ----- 1---- r-------- r------ - --1 -- I- I 1 1 I 1 I R�ilnoff �a��ea= 8537'I-24 +S - 20; I I 1 J_ I I I 18- ,. -- Runoff Vo�um =1;563F 16 _ -- 1 I Rh 134 pth�_ Ou�0 6) -• ... - -- 1I ---- r - - - -I r - -- r --------- .nof - U 14 -" ' I I 1 I I I I I 1 i •A•q�np �/�I q��1 ! - -- ---- I----'----- I--- -J -- -- -I - - -- --- -I-- -- -- \IS II °�u'I-�u'-[, II II iII Y -- u lL 12' - -- I- I I 1 I I I I I I 1 I 1 I I 1 I I 1 I 1 I `'_ — 1 I I I 1 I CI\ =70 10 ,' - •----- I I I I I I I I I I I 1 I I 1 I I I 1---- r---- r--- r---- r- - --I -- ---r---r----r----1----r---y----r---- ; 8- I 1 I I I 1 •' 6— I I I 1 I I I I I I I 1 I " 4 -' _ ".� I I I I I 1 I I 1 I 1 I I 1 1 1 I I I I 1 1 - 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks MAF - PRE Type 11 24 -hr 2 -YR Rainfall = 3.60" Prepared by BASS, NIXON & KENNEDY, INC. Page 8 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC '10/14/2013 1:16:41 PM Subcatchment POI #3: PRE Runoff = 0.84 cfs @ 12.07 hrs, Volume= 0.049 af, Depth> 0.96" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 2 -YR Rainfall= 3.60" Area (sf) CN Description 26,891 70 Woods Good HSG C 26,891 Pervious Area Tc Length Slope Velocity Capacity Description inl (fPPfl (ft /ft) (ft/sec) (cfs) 13.8 Direct Entry, TR55 (Worksheet 3) Subcatchment POI -ff,3a PRE Hydrograph 0.9: 0.85 ='', 0.04 cfs ----------- - - - - -� ----- - -� - -- - - -' -- - -� - -- - rtyp 11 4 =h Z R- - -- i- ,---- r- - -� - -- , - i f- -- ,--- r - - - -, 4a Rainfall- 160 - -- 0.75 =" 0.7 - 0.65''x. 0.6- '. ------- r----- - -r - -- t - - - -r -- -- -r -- -- -r- - -r- --- ;---- r--- ,---- r--- , - - - -�- --- R�uU�ofu V %���'��iii(t ��io�49raf -- 0.55= . ---- -t---- r--- �---- r-- --t - - - -r- --- r---- i - -- -r- r1; - -r -- i--- -r -�a- R�>Jfn�7iiii De.p h, 0.96 - -- - -- - - 3 0.45: "'. -- u . 0.35 1t1 - -- -- - - - - -- - - - -� - -- + - - - -r- - - -� - -- �- - -+ - -- - - - -� - -- °'f0- 0. 3- ",____J____L___J____L_— _J____L_ I____L____ ',____J____L_ 0.25-:' 0.15 = --- '------------ '----- - - -' -- '---- - - - - -� -- - - - - -� ---- ' - - - -� - -- 0.1= ---------- - - - - -� ------ -� - - -- - - -� -- - - - - -� ---- i - - - -; - -- 0.05: 0- 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 5 Time (hours) ■ Runofi R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - PRE Type// 24 -hr 10 -YR Rainfall = 5.38" Prepared by BASS, NIXON & KENNEDY, INC. Page 9 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:41 PM Subcatchment POI #1: PRE Runoff = 9.55 cfs @ 12.05 hrs, Volume= 0.534 af, Depth> 2.28" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10 -YR Rainfall = 5.38" Area (sf) CN Description 7,824 98 Paved parking & roofs 114 578 70 Woods Good HSG C 122,402 72 Weighted Average 114,578 Pervious Area 7,824 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 13.2 Direct Entry, TR55 Subcatchment P01:1`;1 PRF Hydrograph = •----- �---- �----- I----'---- 1-- -- J---- �----- I---- +--- -I - - -- �- __� � -� - - -- l7 Runoff 10- 8.65 cfs -- I I I ---- - - - -; -- T p� I O- -- : - -- ; - - - -; ---- ; - - - -; --- -� - - -- , ; �Ip e 9- -- - -, - - - -�1 ---- II ----1 ---- 1 I - - - - I -- - -- -� I -- -- I - -.. . I . _- .- ^ 8 - -- a- . nI faW�5:3I 8 -R d fi I rb� a 1 I 22i, 0 I I s- f - I 1 I 6 -. - I � j I I I I Td=1!o 2 rajrn LL 1 I 4- 1 1 I I I `N=' --- I I I 1 -- ' - --- 1 ' -- 1- - -I - -- I I 1 1 1 I 1 1 1 3 -" 1 I 1 1 I I I I I I I I I I I I I 2- I I 1 I I I 1 I I 1 I 1 I I 1 1 1 1 1 I 1 : I I I I I I I I I I 5 6 7 0 9 10 11 12 13 14 15 16 17 10 19 20 Time (hours) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - PRE Type 1124 -hr 10 -YR Rainfall= 5.38" Prepared by BASS, NIXON & KENNEDY, INC. Page 10 H droCAD® 8.00 s/n 004300 © 2006 H droCAD Software Solutions LLC 10/14/2013 1:16:41 PM Subcatchment POI #2: PRE Runoff = 59.20 cfs @ 12.07 hrs, Volume= 3.454 af, Depth> 2.12" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10 -YR Rainfall = 5.38" Area (sf) CN Description - _ 7,824 98 Paved parking & roofs 845,300 70 Woods Good HSG C 853,124 70 Weighted Average 845,300 Pervious Area 7,824 Impervious Area Tc Length Slope Velocity min) (feet) (ft/ft) (ft/sec) 14.4 Capacity Description (cfs) Direct Entry, TR55 Subcatchment POI #2: PRE Hydrograph I I I ' ' -- -- ' - -------- '---- '-- - -' - -- - - ' - - - -' -- -- - - -- --- -, - - -- -- - - , - - - , - ' - - - - 1 I I I I I 1 b07 I 1 I I I I I 1 I I I 1 I I i I I 1 I I I 59 60_ I I I I 1 1 i I I I 1 I I 50"• 1 I I I 1 I i I 1 1 I I I 45- 40 -•' 1 1 1 I I I I I I I 1 I 35- 30- Il. I I I 1 I 1 25- T _ _ _ _I T I I I I I 1 20. I 1 I 1 I 1 15:• , , , I I I 10, 1 I I 1 1 I I 1 --- -' -- -- ---- '--- -'- ers 1 I I 1 I I I - -- ; - - -- - - TqP pl -� G��•;`I I I I I I -- - -;- Ra.dnaff Ar(ba =853 -A 214, sf -- I I 1 I 1 1 I - -- RutoffA10-I;�� =344;of hwloff Depth I 1 I I n u I 1 I I I 1 I I I 1 1 I 1 I 1 I I I I I I I I I I I I I 1 I I I '- - -- 1 -' - - -- ' ' - - -- 1 1 I I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ® Runoff R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - PRE Type// 24 -hr 10 -YR Rainfall = 5.38" Prepared by BASS, NIXON & KENNEDY, INC. Page 11 HydroCAD ®8 00 s/n 004300 0 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:41 PM Subcatchment POI #3: PRE Runoff = 1.91 cfs @ 12.06 hrs, Volume= 0.109 af, Depth> 2.12" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10 -YR Rainfall = 5.3811 Area (sf) CN Description 26,891 70 Woods Good, HSG C 26,891 Pervious Area Tc Length S min) (feet) I 13.8 Velocity Capacity Description (ft /sec) (cfs) Direct Entry, TR55 (Worksheet 3) Subcatchufvn�rG: POI #3: PRE Hydrograph I I I 1 I I 1 I I I I I I 2- I I I I I 1.91 crs I 1 I p�I I II I I I I I I I � I 1 ' Ij; :' 6). 3 8 I I I I I I I I I I I I I I I I i 1 I vN I I I I I ' - -_ �. - U, 11 -lL•0 U•_ �� ©6G !'moo II�C.;_ °.0 -- --- -' - - -- - - - - -I- - - - - - -- - - - -I -- 1 �I,�\ I 11 �q (1 O I I I I I I I I I I I 1 1 I I I 1 I I I I 1 I I I I I I I I I I I I I 1 I I I 1 I I I I 1 I I I I I I I I I I I I I I I 1 I I I I I I I 1 I I I I 1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I o- 12 I 5 6 7 8 9 10 11 13 14 15 1G 17 1II 19 2) Time (hours) ■ RunoH R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - POST Prepared by BASS, NIXON & KENNEDY, INC. Page 2 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:17:10 PM Project Notes The Woods at Fairbanks Danny L. Howell, Jr., P.E. These calculations will quantify the post - developed outflows from this property., The methodology used will be the TR -55 method for runoff estimation, using the 1, 2 and 10 year storms as the test storms. Investigation into the types of soils on this site (USDA Wake County Soils Survey) indicates that they are Type C Soils, therefore corresponding Curve Numbers were used in this study. The TR -55 method (Worksheet 3) was used to calculate the time of concentration. R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - POST Type// 24 -hr 1 -YR Rainfall= 3.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 3 H droCAD® 8.00 s/n 004300 © 2006 H droCAD Software Solutions LLC 10114/2013 1:17:10 PM Subcatchment POI #1: POST Runoff = 1.29 cfs @ 11.98 hrs, Volume= 0.056 af, Depth> 0.97" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 -YR Rainfall= 3.0011 Area (sf) CN Description 3,586 98 Paved roads w /curbs & sewers 26,677 74 >75% Grass cover, Good HSG C 30,263 77 Weighted Average 26,677 Pervious Area 3,586 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) - 6.0 Direct Entry, TR65 Minimum Subcatchment POI #1: POST Hydrograph I I I I I I 1 I I I I I I I I I I I 1 I I 1 I I I I I I I I I I , I I I I I I I I ■Runoff I I 1 I 1 1 I I I I I I I I I 1.29 cfs I I 1 I I I I 1 1 I I I I I I I _ 1 _ AIM 9 O l`JE �) �� i `� 0'C'l.' c 0 7'/"_. F.+J ) I 1 1 I I I I I I I I I I 1 I I I I I I � 11 1�yy� ry�� y ({J� p p �(1`n� I� � I I I I ;Ru 9111`\J,u li;�/ ��Il;l!�JII1111 �`?`� -'�n�7 FJ; C/!,u I I 1 I I I I v I I I I I I I I 3 I I I I I I I I I I I j�I I 0 I I I I I I I T c= 6,. O ri 11 id ril LL I I I I I I I I I I 0 F! I I I I I I I I I I I I I I 1 I I I I 1 I I I I I I I I I I I I I I I I I I I I I 1 I I I I I I 1 I 1 I I I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I I I 1 I I I I I I 10 11 12 13 14 15 16 17 18 19 20 Time (hours) R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - POST Type// 24 -hr 1 -YR Rainfall= 3.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 4 H droCAD® 8.00 sin 004300 0 2006 H droCAD Software Solutions LLC 10/14/2013 1:17:10 PM Subcatchment POI #2: POST Runoff = 52.25 cfs @ 11.97 hrs, Volume= 2.315 af, Depth> 1.26" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 -YR Rainfall= 3.0011 Area (sf) CN Description 357,375 98 Paved roads w /curbs & sewers 444,565 74 >75% Grass cover, Good, HSG C 154,926 70 Woods Good HSG C 956,866 82 Weighted Average 599,491 40- Pervious Area 357,375 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft /ft) (ft/sec) (cfs) 6.0 Direct Entry, TR55 Minimum Subcatchment POI #2: POST Hydrograph ' •---- I I I I 1 I I I I I I I I I 1---- r---- r---+---- I----- I---- r---- I---- +---- I- - - --+— I _--- I--- -I - - -- I I I 1 I I I I ■Runoff 55-' ' I I I I I I I I I 1 52.25 cfs --— -� - - -- 1---- -I — - -- ---- '-- - - -' -- - - II --Y �Kq \- —--- '-- - -- - -- Yp ----I— II � � Fp /ry1 50' I I I I I I I 1 1 I I I 1 I I I 1 I I I I - -- ; - - - -, ---- , - - - -; - - - -; - -- ; -- -- - -, - -- ; - - - -; - - -Rain faP1-00 " -- 45 -'' I I I I I I 1 I I I I - -- - - - -; ---- , - - - -; - - - -, - -- ; -- -;- R ff Aria= 956- 866+sf-- 40- "' ; - -- ; - - - -; ---- ; - - - -; --- -; - - -- ; -- - -; "off � �� � =2 `3'I 5� at 35 -- I I I I I 1 1 1 1 I--- -1--- -1 - - - - -- 1 -- ' - -- I I 'lye ' �aa__. --- - - - -, - - - -; -- ; - - - -; I�l#noff D -th� l.2'6 ,. ; 30- . I I 1 I I I I 1 I I I I I I I I T}c��'e LL 25- .' I 1 1 1 I I I I I 1 I I I 1 I I GVA —J82 -_ I 1 I I I I I I a 20- i " I I I 1 I I I I 1 I 1 I I I 1 I 1 1 I 1 I 1 1 I I - -- I 15- • - : • I I I I I I I I 1 I 1 1 1 ---- --- -- +-- -- 1- --- +- --- 1 -- - -�- ---- 1---- +---- 1--- -�---- 1-- --'�--- - +-- -- I 1 I I I 1 I I 10- - • , I I I I J_ _ _I____1____I____J__- _L___J____1 I I I I I 1 1 I I 1 1 1 I rr, .. ......... ............... , 6 7 8 9 10 11 . 12 13 14 15 16 17 10 19 20 5 Time (hours) RA2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks MaF - POST Type 11 24 -hr 1 -YR Rainfall= 3.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 5 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 - 1:17:10 PM Subcatchment POI #3: POST Runoff = 0.52 cfs @ 12.01 hrs, Volume= 0.025 af, Depth> 0.87" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 -YR Rainfall = 3.00'1 Area (sf) CN Description 1,677 98 Paved roads w /curbs & sewers 7,626 74 >75% Grass cover, Good, HSG C 5,985 70 Woods Good HSG C 15,288 75 Weighted Average 13,611 Pervious Area 1,677 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 Direct Entry, Worksheet -3 Subcatchment POI #3: POST Hydrograph 1 I I I 1 I I I i- 1 I I I I I 1 I I 1 1 1 I I 0.55- ' --- , I - - - -I ; --- , I - - - -1 , --- ; t - - - -I ; 052 c(s - ; , -� . I h I r1I ( 0.5 rt Ypq � 0.45- 0.4- ' I I I I 1 I I RU 66�f- l -d -VeW0 61 : c � I I I I I I I I I I 0.35- I I I I I I I 117110 PIMP -- - - - -, RbAhwff- Dempth�4.817 " -- U �- 0.3- 3 - - -- o = ••--- -1---- r--- -t---- r--- -1 LL 0.25 I I 1 I I I 1 1 I 1 I I I I 6 0.2- I I I I 1 I I I I I 1 1 1 0.15- I 1 1 I I I 1 1 1 I I 1 I 0.1- 1 I I 1 I 1 I I I I I I I 1 1 I I I I I I I 1 I 1 I 0.05 - '/ I I 1 I 1 1 I I 1 I I 1 I 1 1 I I 1 10 11 12 13 14 15 18 17 18 19 20 Time (hours) Runoffli R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - POST Type // 24 -hr 2 -YR Rainfall= 3.60" Prepared by BASS, NIXON & KENNEDY, INC. Page 6 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:17:10 PM Subcatchment POI #1: POST Runoff = 1.82 cfs @ 11.98 hrs, Volume= 0.080 af, Depth> 1.37" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 2 -YR Rainfall = 3.6011 Area (sf) CN Description 3,586 98 Paved roads w /curbs & sewers 26,677 74 >75% Grass cover, Good HSG C 30,263 77 Weighted Average 26,677 Pervious Area 3,586 Impervious Area Tc Length :'lope Velocity Capacity Description (min) (feet) (it /ft) (ft/sec) (cfs) _ 6.0 Direct Entry, TR55 Minimum J O W Subcatchment POI #1: POST Hydrograph I I I I I I 1 I 1 I I I I I I I I I 1 1 I I I I I I I I I I I I 1 I I I I I I I I 1,82 cfs I I I I I I I I I air>rfal!� °30 o UU I I 1 I I I i I I I I I Run I,;f I I I I I I I I I I af I I I I 1 I I I I I I I I I I I I I I I I I I tl I c=6;.0() �`'I I ii I I I I I I rrll ni I I I Y I I I I I I I I I I I I KI X77 I I I 1 I I I I I I I I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I I I 1 I 1 I I I I I I I I I I I I 1 1 I I I I I I I I I I I I 1 I I I I I I I I I 1 1 1 I I I I I I I I I I I t I I I I I I I I I I I I I I I I I I I I 1 1 I I I I I 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ,u'mvf R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - POST Type 1124 -hr 2 -YR Rainfall= 3.60" Prepared by BASS, NIXON & KENNEDY, INC. Page 7 H droCAD® 8.00 s/n 004300 © 2006 H droCAD Software Solutions LLC 10/14/2013 1:17:10 PM Subcatchment POI #2: POST Runoff = 70.44 cfs @ 11.97 hrs, Volume= 3.149 af, Depth> 1.72" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 2 -YR Rainfall= 3.60" Area (sf) CN Description 357,375 98 Paved roads w /curbs & sewers 444,565 74 >75% Grass cover, Good, HSG C 154,926 70 Woods Good HSG C 956,866 82 Weighted Average 599,491 Pervious Area 357,375 Impervious Area Tc Length Slope Velocity Capacity Description 6.0 Direct Entry, TR55 Minimum Subcatchment POI #2: POST Hydrograph •"-- -- 1- -- -r - - - -, - -- --- -1 - - -- �- I I , ---- ,---- -� - - - -� - 1 I 75: I I 1 I 1 I 1 I 1 I I I 70-: ; - -- - - -- - -- - - -- -- - -- ----------- Yp4 -II A, hr 2, R- - • r I I I I I I I I I I ° - •�— I I 1 I 1 - I I I 60= --- '-------- '---- !---- '- - - -j -- ---- I---- 1 - - - -'- ----- -' - - -- -- -! - - -- RLinoffr Ar6a =966;066 sf 55 -• _.f __•r-__ 50=•' 1 1 I I I I I.6.1gi Off; -il -o l;�J011U`�'"- J`tii'�a9'- •--------=---- i---- 1---- '- - - -� -- --- -'- : 45- I I I 1 ( I I I n I • ,.___,___ _I- .- __T____I____..I ____I_.- __T -R�NJN II�f Depth In -I11__ r 40-' I 1 I I I 1 I I o ,�• - - -, 1 I I I I i Tc=6..0 Min lL 35. -T -- -- ' 3U: L__- J_- __L___CN=1 82 -- I I I I I 1 25- I I I I 1 I I I I I I _ _ _ _I _ _ _ _ T _ _ _ _ I_ _ I _ _ _ -F- 20' I 1 I I I 1 1 I I I I I I 15- - I 1 I I I I I - - - - - -- -- - - - - - - I -- - - - - -- --- - - - - -- -- -j - - - -j ---- ,- - - --(- I 1- I � I I I 1 I I I 10 =• I I I 1 1 1 5: 1 I 1 i 0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) ■Runoff R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - POST Type// 24 -hr 2 -YR Rainfall= 3.60" Prepared by BASS, NIXON & KENNEDY, INC. Page 8 H droCAD® 8.00 s/n 004300 © 2006 H droCAD Software Solutions LLC 10/14/2013 1:17:10 PM Subcatchment POI #3: POST Runoff = 0.75 cfs @ 12.01 hrs, Volume= 0.036 af, Depth> 1.25" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 2 -YR Rainfall= 3.60" Areas CN Descri tion 1,677 98 Paved roads w /curbs & sewers 7,626 74 >75% Grass cover, Good, HSG C 5,985 70 Woods Good HSG C 15,288 75 Weighted Average 13,611 Pervious Area 1,677 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 Direct Entry, Worksheet -3 Subcatchment POI #3: POST Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) I ' I I ' ■Runoff I I 1 I I 1 1 I I I I I I +--- -�A --- 1 -- - -Ia --- 0.8=" - -- I - -- -F --- �-- - -�--- I- - -- 0.7bcfa ----- -- I- ---� - -- 0.75-• -- IYpo 0.65- ' I I n ®1 Aeea= 1- 5,288LS.f -- 0.6-: '' _ _ J__L___J____L___ l____L_ ___L__R - I I 1 Ip// : 0.55 -" ,. - -- --- -i - - -- - - - -i - -- i - - - -i - H� ❑�, ry - -- R�1®ff Cfo 'p ��9•�1J��7�af -- I'I - 0.5- - -- t---- r----- - -r - -- 1 - - - -r- -- r - - - -r r - -- , -- - r--- -I--- -r -��- R-unoff-DeptM -0 u 0.45 -' - -- - -- -� - -- -- - -r - -- - - - -� - I --- ----- 1- •25 -- 1 I 1 I I I 3 1 1 I I I 0.35= " ' ' ' ' ' 0.3. -� I I I I I --- i---- r------- r--- 1 - - - -r- I I I I I I ---r---+----+-------r----1----r--- I I I I I I I 0.25- .--- J----'---- J---- L--- J----L_ -- -L- -- �---- L---J----L-- --- --L- -- I I I 1 I I 1 i" 0.2-• I I I I I 1 I I ' __ -' I ___1 1 I I I ___r I -_1 I I I I I 0.15-' I I I I I 1 ---�---- r-- - - - - -I - I I -- r---- I---- r-- - - - - -r ---- I - - - -r - -- I I 1 I I 0.1- : nnq -• 1 1 1 1 I I --- J---- L--- J-- --L--- J -- - -'- , r I I I - I ---'----L---'----L----'----L---- 1 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - POST Type// 24 -hr 10 -YR Rainfall = 5.38" Prepared by BASS, NIXON & KENNEDY, INC. Page 9 H droCAD® 8.00 s/n 004300 0 2006 H droCAD Software Solutions LLC 10/14/2013 1:17:10 PM Subcatchment POI #1: POST Runoff = 3.50 cfs @ 11.97 hrs, Volume= 0.158 af, Depth> 2.72" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10 -YR Rainfall = 5.38" Areas CN Description 3,586 98 Paved roads w /curbs & sewers 26,677 74 >75% Grass cover, Good HSG C 30,263 77 Weighted Average 26,677 Pervious Area 3,586 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, TR55 Minimum Subcatchment POI ;;'l : POST Hydrograph I I I I I I I I 1 I I I I I I IE" I I I I I I I 1 I I I I I I I I I I 1 3- I I I I I I I I I I I I I I I I I I I 1 I I I I I I I V I I 3 2 LL I I I I I I I I I I 1 I I I I 1 I I I I I I I I I I I I 1 I 1 I 1 1 I I 1 I i I 1 I I I I I I I 1 I I I I I I 1 I i 1 I I I I I I I 1 I I I I I 1 I I I I I I I I I I I I c I ki cl III I I I I I I I I I I I I I n I Rurhli o ii V(()hIfl1�C' °�o; 5ff I I � -• i, I I I I I I I I w ;lGG0 Inn) vo I I I I �II _ I11 I I I I I I VY� ®I�il I I I 1 I I I I 1 I 1 I I I I 1 I I --- -I--- -i -- -I--- -r-- --1----T-- -i I I I I I I I I I 1 I I I t 1 I I I I 1 I I I I I I I I 1 I I I I 1 I 1 I I I I 1 I I I I 1 I i 10 11 12 13 14 15 16 17 18 19 20 Time (hours) R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - POST Type // 24 -hr 10 -YR Rainfall= 5.38" Prepared by BASS, NIXON & KENNEDY, INC. Page 10 H droCAD® 8.00 s/n 004300 © 2006 H droCAD Software Solutions LLC 10/14/2013 1:17:10 PM Subcatchment POI #2: POST Runoff = 126.77 cfs @ 11.97 hrs, Volume= 5.828 af, Depth> 3.18" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10 -YR Rainfall = 5.38'1 Areas CN Description 357,375 98 Paved roads w /curbs & sewers 444,565 74 >75% Grass cover, Good, HSG C 154,926 70 Woods Good HSG C 956,866 82 Weighted Average 599,491 Pervious Area 357,375 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft /ft) (ft/sec) (cfs) - 6.0 Direct Entry, TR55 Minimum Subcatchment POI #2: POST Hydrograph I I I 1 1 1 1 N-11 unoff 8.77 crs 1 I I I I I I I I YI , I I p� I I I Raolr�faYl'�5.�8 °° - I 1 1 1 Ruj'noff Arch = 956,866: sf - - -i - -- Rep h3o1;8 lunof � " "- I I I I I I I I I I I I I I 1 I I I 1 I 1 I I I I I I I I I I I I I I I I I I I I . I . . I . . . . I . . . , . . . , . . . 5 6 7 II 9 10 11 12 13 14 15 1G 17 1II 19 20 Time (hours) I I I I I 1 140- I I I I I 130. I t I t 1 120; 1 I I 1 1 F- 110-1 100.• I I I I I I 90- w 80- — ---L----I----L- — L----I v -, — --J— — — I I t I I I 3 70- • o-- ,• 1 1 I I I I -- ---- 1--- - -4- - -- - -- - - - -�- I 1 I 1 LL 60, I I 1 I 1 1 I I 1 50• ! I I I I I I I I I I 1 40- •, 1 I I I I I 1 I 1 I I 30-1 1 1 I I I I I I I I I I 1 20- I I I 1 1 1 1 N-11 unoff 8.77 crs 1 I I I I I I I I YI , I I p� I I I Raolr�faYl'�5.�8 °° - I 1 1 1 Ruj'noff Arch = 956,866: sf - - -i - -- Rep h3o1;8 lunof � " "- I I I I I I I I I I I I I I 1 I I I 1 I 1 I I I I I I I I I I I I I I I I I I I I . I . . I . . . . I . . . , . . . , . . . 5 6 7 II 9 10 11 12 13 14 15 1G 17 1II 19 20 Time (hours) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - POST Type// 24 -hr 10 -YR Rainfa /1= 5.38" Prepared by BASS, NIXON & KENNEDY, INC. Page 11 H droCAD® 8.00 s/n 004300 0 2006 H droCAD Software Solutions LLC 10/14/2013 1:17:10 PM Subcatchment POI #3: POST Runoff = 1.53 cfs @ 12.01 hrs, Volume= 0.074 af, Depth> 2.54" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10 -YR Rainfall =5.38" Area (sf) CN Description 1,677 98 Paved roads w /curbs & sewers 7,626 74 >75% Grass cover, Good, HSG C 5,985 70 Woods Good HSG C 15,288 75 Weighted Average 13,611 Pervious Area 1,677 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 9.0 Direct Entry, Worksheet -3 Subcatchment POI #3: POST Hydrograph I I I I I I 1 I I I I I I I 1 I I I I I r I I I I I I I I I I I I I I I I I I 1 I 1 I I I I I 1 I I I 1 I 1 I I I I I I I I I I 1 1 I I 1 I I I I I I I I I I I I I I 1 I I I UI 1 I 1 I I v I I I 1 I I 3 I I I I I I G 1 I I I I I ll. I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I J 1 I I I I 1 0- . 5 6 7 II 9 10 11 1 I I I I I I I I I I! ', Run Off I I I I I I I I I I I I I I I I I I III l �G�if I`� it �M PRW I I I I 1 I 7. I I I I I I I lllc °cOX If-0i fill I I I I I I II11 I I I I p I I I I I I I I I I I 1 I I I I I I I I I I I 1 I I I I I 1 I I I I I I I I I I I I 1 I I I I 1 I I I 1 i I 1 I I I I I I 1 12 13 14 16 16 17 Iii 19 20 Time (hours) Water Quality Retention Calculations Project Name: The Woods at Fairbanks Determine Surface Area Required for Permanent Pool: Drainage Area: Impervious Area: Percent Impervious: Permanent Pool Elevation: Volume: Surface Area: Hydraulic Depth: SA /DA Required: SA /DA Provided: Forebay Volume Check: Forebay Volume at Crest of Berm: Permanent Pool Volume: Forebay Volume % of Perm. Volume: 15.45 ac = 672848 sf 7.83 ac = 340862 sf 50.7% 374.00 (1 /2 way up vegetated shelf) 88,798 cf 16,500 sf 5.21 ft (Option 2 Calculation BMP Manual) 2.45% 2.45% 18,480 cf 88,798 cf 20.81% Calculate the Volume Required to Treat the First Flush: Rainfall to Treat: 1 in Runoff Coefficient (Rv) �. 0.05 0.009 *(% Impervious) Runoff Coefficient (RJ: 0.51 in /in Runorr Volume (V) ; Rainfall " (Rv) * (Drainage Area) Runok: Volume (V): 28,368 cr Calculate the Depth Required for the Temporary Pool: Temporary Pool Volume (Required): 28,368 cf Total Volume (Perm. + Temp.): 117,166 cf Temporary Pool Elevation between: 375.00 and 376.00 Temporary Pool Elevation: 375.62 Temporary Pool Depth: 1.52718.26" measured from Permanent Pool Elevation Weir Elevation (Standpipe): 376.65 1" (First Flush) 10/15/2013 Determine the Orifice Size for 2 -5 Day Drawdown: Orifice Invert Elevation (PWE): 374.00 Weir Elevation (Standpipe): 376.65 Orifice Diameter: 2.50 in Depth to Weir Elev from PWE: 2.65 ft Use the orifice equation to determine flow and drawdown time: Orifice Equation: Q = CA(2gh)0.5 Volume to Draw Down: Flow for 2 -Day Drawdown: Flow for 5 -Day Drawdown: C: g: A: h: (Weir - PWE) /3 Q: Drawdown: 28,368 cf 0.16 cfs 0.07 cfs 0.60 32.20 ft/sZ 0.03 sf 0.88 ft 0.15 cfs 2.13 days (OK - Drawdown is b/w 2 -5 days) 1" (First Flush) 10/15/2013 Water Quality Retention Calculations Project Name: fhe Woods at Fairbanks Determine Surface Area Required for Permanent Pool: Drainage Area: Impervious Area: Percent Impervious: Permanent Pool Elevation: Volume: Surface Area: Hydraulic Depth: SA /DA Required: SA /DA Provided: Forebay Volume Check: Forebay Volume at Crest of Berm: Permanent Pool Volume: Forebay Volume % of Perm. Volume 15.45 ac = 672848 sf 7.83 ac = 340862 sf 50.7% 374.00 (1/2 way up vegetated shelf) 88,798 cf 16,500 sf 5.21 ft (Option 2 Calculation BMP Manual) 2.45% 2.45% 18,480 cf 88,798 cf 20.81% Calculate the Volume Required to Treat the First Flush: Rainfall to Treat: 1.5 in Runoff Coefficient (R„) = 0.05 + 0.009'(% Impervious) Runoff Coefficient (R„): 0.51 in /in Rllnoff Volume (V) = Rainfall (Rv) „ (Drainage Area) RunoFi VOILUTIe (V): 42,552 cf Calculate the Depth Required for the Temporary Pool: Temporary Pool Volume (Required): 42,552 cf Total Volume (Perm. + Temp.): 131,350 cf Temporary Pool Elevation between: 376.00 and 377.00 Temporary Pool Elevation: 376.22 Temporary Pool Depth: 2.22726.6" measured from Permanent Pool Elevation Weir Elevation (Standpipe): 376.65 1.5" (First Flush) 10/15/2013 Determine the Orifice Size for 2 -5 Day Drawdown: Orifice Invert Elevation (PWE): 374.00 Weir Elevation (Standpipe): 376.65 Orifice Diameter: 2.50 in Depth to Weir Elev from PWE: 2.65 ft Use the orifice equation to determine flow and drawdown time: Orifice Equation: Q = CA(2gh)0.5 Volume to Draw Down: Flow for 2 -Day Drawdown: Flow for 5 -Day Drawdown: C: g: A: h: (Weir - PWE) /3 Q: Drawdown: 42,552 cf 0.25 cfs 0.10 cfs 0.60 32.20 ft/s2 0.03 sf 0.88 ft 0.15 cfs 3.19 days (OK - Drawdown is b/w 2 -6 days) 1.5" (First Flush) 10/15/2013 W �L J O Z a m J W 0 a w uj w a ICI (--I O O in O a T- T- 't O C) W 0 ii 0 0 0 0 0 0 0 0 � I�00MOr(V Md' J (0 (0(dhhhhh M M M M co M co M M W O O o O N Q O tt11JJ V d 0 h M 0 0 0 0 0 0 O OOOOOOOOLnOLn000000 O O O o 0 0 0 0 0 0 0 0 0 0 0 0 0 Nt 0 d' W M M d' d' U) (D 00 0) 0 0 0 W (0 CM M M M M M M I- M t- OM M ('M V,h�hP.wco CO M M M M M CO t� Q 11j f� r 0 N O W r 0 M M 0 r h r O r r O N O h O r 0 M 0 h h r O 0 d' O O M O 0 O O [L,O� rNNNNNNMCMMd;d;d;"uL hO7T O (0(0(00 0 C) 0 0 0 o 0 o 0 0 0 0 0 o O o 0 0 0 L() LO J(�.: U (0 C M d. M R LO C\ Uf 00 0 O O � N M r `- I- U) w aa LLI W u-) 1.0LnLnLnu) O O LO LO L() M O M_ M O W O L() 00 m 0 O � M U) (D Q' L U U"1 o O ~(D(01-00od O d h M N 0001`(OM00rI�d N 'It h (D M h r d' 00 ��� 04 Q hrNMd'(0h00000)ONd W r hONM r r N N 0) L 0 O N 00 N (D O dw Q) r r N M M M et O 0) o 0 0 0 o 0 0 0 W 0 0 0 0 0 0 0 0 J h w � 0 0 0 Ln M O N O d' L() 0) M 0 00 M O h O d o h 0 (0 LO r N r M M o O h (r0 W (0 d' N O 0) Oh �( j 00 (D d C7 M d J 0 O O O r r r N r (M r 0~ O d7 d) r r N M N LO N h N r JCD UJ 0(D 000 Ln C M O N O d' to 0 Ln N O r LC) h LO N O h O d' O h O M L() r o M y�� l� N 0 h r 00 O 0) dt M (0 00 (O 't M M U) O U1 Q e>. h d) O c r -' r N r OM r M r Ln r 1" r 00 r 0) r r N M N Ln N 1` N 00 N Q �OOtoNNWMNawcOl' 0 0 0 0 0 0 0 0 0 0 0 0 aIN 0 0 0 W to �� co M N O O 00 (D N In M M U') N 00 O CT1 ti O N d' M (D M 00 N 00 (IS 06 0) r r r 't- v" N N N N N N O 000000001nOLn000000'd:d; o 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 W L(j (4 1. a0 0) O O O W (D M CO M CO M COhhhrhhr.hhhhh0000co M M M M M M M M M M M M M M M M T O 0 n V Z O g U U W J a 00 w O LL a w w ICI 0 0 0 0 0 0 0 0 ii 0 0 0 0 0 0 0 0 � I�00MOr(V Md' (0 (0(dhhhhh M M M M co M co M M r O O o O N Q O tt11JJ V d 0 h M 0 0 0 0 0 0 0 0 0 r O Q-- 00000000 w �NOrNMd' LnOh rn a W W U= In o O 0) LO 0) o 00 a 0 a 00 �U O O La M LO N 'IT OrO O d w co QJQ`•O Nd hO7T O w LO L0 LO LO L() LO J(�.: U (0 C M d. M R LO C\ O h 00 r o 0 (V (\INMMd w u-) 1.0LnLnLnu) NoO 0000NI-�O L Q v N N N M M d Q W N 00 N (D O dw Q) N N M M M et o 0 0 0 o 0 0 0 W 0 0 0 0 0 0 0 0 J h 00 � o r N M d Lu (D (0 (D h h I- h h (1) M M M M M M M .^p M 0) � � N vo rn� O N m a) L C U C a) �U W CU O a) c tU 0 IL I- O O a) a) .0 U N O m C N M O O a c a) C N E a) .O O N M N O C)) Q a) m � C) C C O Ca E O a) O p. �a Q � U � N O O O M O r a) C6 I-- a) U 7 O U) L2. N o 0 M >, LO CV �2 V t Q C-) Cl) LO (6 V t CL tiQCOLq ui N LO 4- Q o O �00'2�N V L O.. o a) p0C)M N LO V L Q. CCa) D C) co COO _ L N .0 Q. O N =Ap CV N V C 0 it 0 Q M C E O O — (D O Q- C Q W N a) Cl) t6 .fl O A Z C7 M T" O O `- N N � .a r O O N M r c O O N Q 4 .� O U � (0 U C CL v a) rn IT a� Q �a c ns IL � m � c a rn � a) V > N Q- c ::3 O c>u 3 n. O N � .. U) U ' CO O� U) LO N LO W Lo N d LO I` �j �y CM N Ili (O Ld 1� (6 a0 N d ao (o M r CO M M r r- N Y c lV M L V. E C c� O (� O c O Q. vt o �~ o �. U ° � U) t 0 0 U) o 0 0 Q a`)r -- E" o o�- E ® o m o o m m E o c. a� m I- 0 m w o � E � aw any z O¢ oo4ao c c¢¢ m o L V (d U O L U U m v 7 ` > Q m ° w >wwwwo= <IL i, I 'I, 29 70, 2i, 50 Fa 100=YEAR i' W lAG CALCULATION R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Prepared by BASS, NIXON & KENNEDY, INC. Page 2 HydroCAD® 8.00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:01 PM Project Notes The Woods at Fairbanks Danny L. Howell, Jr., P.E. These calculations will determine the amount of attenuation provided by the proposed wetpond. The methodology used will be the TR -55 method for runoff estimation. Investigation into the types of soils on this site (USDA Wake County Soils Survey) indicates that they are Creedmoor (CtC /CtB) for the drainage area, therefore Curve Numbers corresponding with Type C soils are used in this study. The TR -55 minimum time of concentration of 6 mins was used for calculations. Routing information has been provided for the 1, 2, 10, 25, 50 and 100 -year design storms. R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type 11 24 -hr 1 -YR Rainfall= 3.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 3 HydroCAD® 8.00 s/n 004300 0 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:01 PM Subcatchment 1S: TO BASIN Runoff = 43.96 cfs @ 11.97 hrs, Volume= 1.979 af, Depth> 1.54" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 1 -YR Rainfall= 3.00" Area (sf) CN Description 322,680 74 On >75% Grass cover, Good, HSG C 9,306 74 Off >75% Grass cover, Good, HSG C 332,527 98 On Paved parking & roofs 8,335 98 Off Paved parking & roofs 672,848 86 Weighted Average 331,986 Pervious Area 340,862 --- I---- r---- I---- t-- - -r - -- I -- ----: ---- + - - - -- Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, TR55 MIN Subcatchment 1S: TO BASIN Hydrograph I I I I I I I I I I 1 48 ',----- -1 - - -- ---- 1---- '4---- 1---- 4---- 1.--- -1 - - -- ---- 1---- -1---- 1-'• -- --- -1 - - -- I I 1 I I I I I 1 I I I I ■Runoff 46 =" -•---- 1---- t-- --I---- T---- ,---- -143.98cfa ----I----r----r---7----I----7----T---- 44 : --- J---- 1----- '---- !---- I- - - -J -- ---- 1-- - -1 - -- V- �N -/AG I 1 1 42: --- I---- r---- I---- t-- - -r - -- I -- ----: ---- + - - - -- 40-`. --- -' -- -- I ----I - - -- I --- -1- - -- I -- --- --- -- I --- -I- QO- � � I � I I � 1 38- ,• ------- �---- 1---- 1---- I- - - -� -- - '-------- 1 - - - -' - - -1 36 - ",. --- ,---- r---- I---- T-- - -r - -- I -- - - - -1- Rn- off = Aria= 872,848isf= 1-- 34 -' --- 1-- -- L-- -- '---- --1_ ---1 -- - - - -'- 7 1 I I 1 I I I I I 32_" dT ffr o 1 X 79 u � -a# 30; - - - - - - - - -- I - - - - - " 26-' '---1----x--- -�----7-- --r --- -7-- ----I--- r-ttRu-noff De{�tk� 1:�i4 -- 3 24-' -L- _ J _ - _ 1 --®- 22- -- - -- ; - - - -; --- -, - - -- T ---- , - - - -�- ---- , - - - -; LL 20'.' ,. --- J---- L---- 1--- -1--- -I- ---J- ---- I- - - -� ---- '---- J - - --� --- -''e-- -' -A- -- 18_ / = IIV =BV -- - -- t---- r---- r--- t--- -I - - -- I- ---- I---- r-- - -r - -- t� ---- r- - -VN 16= --- '---- L---- 1---- !---- ' - - - -J- ----'--------'----J----'----'----- I I I I I I I I I I I I I ---- 14'" - -- 1 - - - -+ --- -1 - - -- --- -1 - - -- �- ---- I---- +` - - -1 - -- �---- 1---- 4--- -4 - - -- I I 1 I I 1 1 12 =' 1 I I I I I ---- ------ r- -- -, - - -- T ---- , - - - -�- --- -, - - -- T ---- ,--- - - - - -r ------ -7 - - -- 10 : ' _ _ _ -J _ _ _ _ L _ _ _ _I _ _ _ _ 1 _ _ _ _ I_ _ _ _ J- I I 1 I 1 I I I I I I I I 8 si''. •----I-- -- L----1-- -1----1----J- --'- ---�'- ---I----J----1- -- -J----1 - - -- I I I I I I I I I 1 I I I : , 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks WAIF - WETPOND ROUTING Type 1124 -hr 1 -YR Rainfall= 3.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 4 HydroCADO 8.00 s/n 004300 0 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:01 PM Pond 1 P: 90% TSS WETPOND Inflow Area = 15.446 ac, Inflow Depth > 1.54" for 1 -YR event Inflow = 43.96 cfs @ 11.97 hrs, Volume= 1.979 of Outflow = 2.62 cfs @ 12.91 1 irs, Volume= 0.768 af, Atten= 94 %, Lag= 56.3 min Primary = 2.62 cfs @ 12.91 1 irs, Volume= 0.768 of Secondary = 0.00 cfs @ 5.00 1 irs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 376.80'@ 12.91 hrs Surf.Area= 22,174 sf Storage= 55,116 cf Plug -Flow detention time= 212.0 min calculated for 0.768 of (39% of inflow) Center -of -Mass det. time= 127.3 min ( 909.1 - 781.8) Volume Invert Avail.Storage Storage Description #1 374.00' 147,067 cf Stage /Storage Data (Prismatic) Listed below Elevation Surf.Area Inc.Store Cum.Store (feet) (sq -ft) (cubic -feet) (cubic -feet) _ 374.00 16,500 0 0 374.50 18,250 8,688 8,688 375.00 19,000 9,313 18,000 376.00 20,740 19,870 37,870 377.00 22,540 21,640 59,510 378.00 24,400 23,470 82,980 379.00 26,320 25,360 108,340 380.00 28,310 27,315 135,655 380.40 28,750 11,412 147,067 Device Routing Invert Outlet Devices #1 Primary 365.90' 15.0" x 79.9' long Culvert RCP, groove end projecting, Ke= 0.200 Outlet Invert= 360.00' S=0.0738'/' Cc= 0.900 n=0.013 #2 Device 1 376.65' 48.0" Horiz. Standpipe Limited to weir flow C= 0.600 #3 Device 1 374.00' 2.5" Vert. Orifice C= 0.600 #4 Secondary 378.55' 50.0' long Sharp- Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max =2.58 cfs @ 12.91 hrs HW= 376.80' (Free Discharge) 't--1 =Culvert (Passes 2.58 cfs of 22.19 cfs potential flow) 12= Standpipe (Weir Controls 2.31 cfs @ 1.25 fps) 3= Orifice (Orifice Controls 0.27 cfs @ 7.90 fps) T econdary OutFlow Max =0.00 cfs @ 5.00 hrs HW= 374.00' (Free Discharge) ---- 4 = Sharp- Crested Rectangular Weir ( Controls 0.00 cfs) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks MaF - WETPOND ROUTING Type // 24 -hr 1 -YR Rainfall = 3.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 5 HydroCAD ®8 00 s/n 004300 0 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:01 PM Pond 1 P: 90% TSS WETPOND Hydrograph I I 1 1 I I I I I 1 I I i 1 ----------------------------- I I 1 I 143.96 ds 1 I 1 I 1 •' 1 1 I I 1 I 45- - ' -q- - /' I 1 I I I I 40' I 1 I i 35- - - -� - - -� - -- -- - - - -�- - t- .', I 1 I I 1 1 30 ' - - - - -- --- +--- + - - - +- � SCI _ • ' I 1 1 I I I 25-' ' --- L---L- --1 ---1-- -1- - -� O I I I 1 I I i Il. 20 ' ,' I I I 1 I I 15 1 I I I I I I I I 1 i I 10- ' . I I I I 1 ; 2.6i 2.62 ds I I I I I 1 I I I I I I 1 I 0 Outflow Area =1.5 4;4$ LMInflow mary .Inflow: _cc__ condary _--- P_dak_E1e_V=376,$0'__ I I I I I I I Mmoe_= 55,116 cf I I I 1 I I I 1 I I 1 I I I -- I I I I I 1 1 I I I I I 1 I I I 1 1 I I I I I 1 1 I I I I I I I 1 I I I i I I 1 I 1 I I 1 I 1 I I I I 1 I 1 1 I I I I I I I 1 I I 1 I I 10 11 12 13 14 15 16 17 10 19 20 Time (hours) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type 11 24 -hr 2 -YR Rainfall= 3.60" Prepared by BASS, NIXON & KENNEDY, INC. Page 6 HydroCAD ®8 00 s/n 004300 C 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:01 PM Subcatchment 1S: TO BASIN Runoff = 57.33 cfs @ 11.97 hrs, Volume= 2.615 af, Depth> 2.03" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 2 -YR Rainfall = 3.6011 Area (sf) CN Description 322,680 74 On >75% Grass cover, Good, HSG C 9,306 74 Off >75% Grass cover, Good, HSG C 332,527 98 On Paved parking & roofs 8,335 98 Off Paved parking & roofs 672,848 86 Weighted Average 331,986 Pervious Area 340,862 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft /sec) (cfs) 6.0 Direct Entry, TR55 MIN Subcatchment 1S: TO BASIN Hydrograph - ,--- I I I I I I I I I I I i I I -- - - -- '--- -I---- '---- I---- A-- --I'--- -I----L-- -- I' - - -- ----- I----- J--- -I - - -- I I I I ■RunoB 60' 1 I I I I I I I I I I I I I 57.33 ds I I I I I I 1 55 -" ; KaIrllfa�0 =3.60" 50. ; - 45 -. •____J____L____I____1 ____I____J_- ____I____1____I__- _J____L_ _J____1 ____ Rdnoff Arta= 672;848:sf 407 ' '� I � R kA off: �c� O � nj =2 :615- of I 5--- " U35- i" ' -- -- J- -- -L-- --I---- L- --- I- - --J -- - --- --- -- --- - - - -! ..-- -�--- -1 - - -- I I I I I I 1 I I I I I I I I I I I I 1 -/ 91 30;; " I Tipp 0_ni 1 l-n. LL. .L. J _ L —61 - -- I � 25- i I I I I I I I I I I I ,�1 I - -- - - -- --- -' - - -- --- -� - - -- �- I ---- Chi '---- - - - - -� - - - �86 -- 20- ' I 1 I I I I I I I I 1 �- --- -� - - -- ---- I-------- 1-- --J - --- i -- --- ." --------- ----------------- I I I 1 I 1 I I I I I I I 15 -' --------- I I I I I I I I I I I I I 1----�--- -I-- -- �- ---- I--- -�--- -I 1-------- I-------- �- - - -- 10 -' I I I I I 1 I I I I I I I I I I I I I I I I I 1 I I I I I I I I I I I 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks MaF - WETPOND ROUTING Type 11 24 -hr 2 -YR Rainfall= 3.60" Prepared by BASS, NIXON & KENNEDY, INC. Page 7 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:01 PM Pond 1 P: 90% TSS WETPOND Inflow Area = 15.446 ac, Inflow Depth > 2.03" for 2 -YR event Inflow = 57.33 cfs @ 11.97 hrs, Volume= 2.615 of Outflow = 11.59 cfs @ 12.16 hrs, Volume= 1.400 af, Atten= 80 %, Lag= 11.4 min Primary = 11.59 cfs @ 12.16 hrs, Volume= 1.400 of Secondary = 0.00 cfs @ 5.00 hrs, Volume= 0.000 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 377.07' @ 12.16 hrs Surf.Area= 22,676 sf Storage= 61,226 cf Plug -Flow detention time= 157.3 min calculated for 1.400 of (54% of inflow) Center -of -Mass det. time= 80.5 min ( 856.1 - 775.6) Volume Invert Avail.Storage Storage Description #1 374.00' 147,067 cf Stage /Storage Data (Prismatic) Listed below Elevation Surf.Area Inc.Store Cum.Store (feet) (sq -ft) (cubic -feet) (cubic -feet) 374.00 16,500 0 0 374.50 18,250 8,688 8,688 375.00 19,000 9,313 18,000 376.00 20,740 19,870 37,870 377.00 22,540 21,640 59,510 378.00 24,400 23,470 82,980 379.00 26,320 25,360 108,340 380.00 28,310 27,315 135,655 380.40 28,750 11,412 147,067 Device Routing Invert Outlet Devices #1 Primary 365.90' 15.0" x 79.9' long Culvert RCP, groove end projecting, I<e= 0.200 Outlet Invert= 360.00' S=0.0738'/' Cc= 0.900 n=0.013 #2 Device 1 376.65' 48.0" Horiz. Standpipe Limited to weir flow C= 0.600 #3 Device 1 374.00' 2.5" Vert. Orifice C= 0.600 #4 Secondary 378.55' 50.0' long Sharp- Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max =11.49 cfs @ 12.16 hrs HW= 377.07' (Free Discharge) t- = Culvert (Passes 11.49 cfs of 22.38 cfs potential flow) 2 =Standpipe (Weir Controls 11.20 cfs @ 2.12 fps) =Culvert (Orifice Controls 0.28 cfs @ 8.29 fps) Secondary OutFlow Max =0.00 cfs @ 5.00 hrs HW= 374.00' (Free Discharge) t-4= Sharp- Crested Rectangular Weir ( Controls 0.00 cfs) R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type// 24 -hr 2 -YR Rainfall= 3.60" Prepared by BASS, NIXON & KENNEDY, INC. Page 8 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:01 PM Pond 1 P: 90% TSS WETPOND Hydrograph I 1 I I I 1 I I I I I 1 1 I 1 1 1 I I 1 1 1 I I I 1 I I 57.33 ds 1 1 1 I 1 I I I I t I I I I I 1 I I 1 I n-f1 W: Ar6a =15. -4.46 c 60- I 1 1 Ptak Elev= 377.07 - . - --- r--- r--- r- - - T - - -T - - - I -I----I----1----I----r---r---r--- 55." Stora0e =61_,226!-Cf__ I - - - I , - - - i - - - ! - - - i - 1 I ' - - - -� I 1 I - -; - -, -- I I I I 1 50- 45 _• ' - 1 I I 1 1 i I 1 I 1 I I 1 ' • I I I I I I 1 I I I 1 I 40 I I I I v 35- 30- • • -- I I 1 I 1 I I I I I I I _T___T___T .__ I_ _ __ ___________1____1____1____1____ 25- I I 1 I 1 I I 1 I I I _-- _I____I_- __1111____1_ - -- 20- 1 1.59 cfs 11.59 cfs /;', _�___ -4 ____1____,____1____1____ 1____ 15 -' • I I I I I I I I I I 1 •' I I I I I 10 -' 6 7 is 9 10 11 12 13 14 15 16 17 13 19 20 Time (hole's) LMInflow flow ary ondary R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type// 24 -hr 10 -YR Rainfall = 5.38" Prepared by BASS, NIXON & KENNEDY, INC. Page 9 HydroCAD® 8.00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:01 PM Subcatchment 1S: TO BASIN Runoff = 97.62 cfs @ 11.97 hrs, Volume= 4.603 af, Depth> 3.58" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 10 -YR Rainfall =5.38" Area (sf) CN Description 322,680 74 On >75% Grass cover, Good, HSG C 9,306 74 Off >75% Grass cover, Good, HSG C 332,527 98 On Paved parking & roofs 8,335 98 Off Paved parking & roofs 672,848 86 Weighted Average 331,986 Pervious Area 340,862 Impervious Area Tc Length Slope Velocity Capacity Description (min) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, TR55 MIN Subcatchment 1S: TO BASIN Hydrograph i L___ J__-_ L___ J ____L____I____1____I____.l____L I I I I I I I I I I I ■ RUnoff 105 =' .' .----- I I I I---- r---- I---- r---- I---- r-------- -t---- r--- -+ - - - -r ---t----r----I---- : 100:" 87,82 Cr3 I I I I I I I - - -1- --- -r---- - -I - - -- - - - - -7 - - -- 95 ='�. ----- 1---- r---- I---- r---- I- r- r-- �yp r�-g� Y --- ' - - - -� ---- 1 - - - -� -- - -I - -- I - - -- -- - -' - -T p--e- - I`�� °'i -O- -I - I I 1 I I I 1 19' B- T 1 I I I I I I 1 I Al 85:' .•---+-------- 1 - - - -1 ---+-- --1- ----a ----1----a---a nf�If1.,= .�.JV,r- : • I I 1 I I I 1 I I I i I I 80 -: --- , - - - -; - -- , - - - -, - -- ; - - - -,- ------ Rdit6f'f- Af6a--67Z,'g4&sf= 70= --J----L----I----L---J----L- '- I I I I 1. 1 ---- �R-upoff'Vol€r 65- _ __J_ _ __ L ___J____L __ _ J__ _1_ I____ 1 60 ..- ___y____r____�____i____y____r_ I I Runoff De;pth-�3. W - 3 55- • - -- ---- r---- I-- - -r - -- - - - -r- --- r-- - -r - -- ---- r - - =T -- - r--- -1 - - -- . o 1 1 I 1 1 I 1 1 I I T'w l 0 I I h d 45 =" � I I I 1 1 I 1 I --- 1--- -L----1--- -t ---J----L- --- 1--- -I--- -�--- -I- ---1-- --1----1- --- : 35.' : • I I I I I I I I 1 I I I I - -- I---- r-- -- 1---- r--- y - - - -r- --- r---- r--- y---- r--- 1-- - -r - -- I - - -- I I I 1 I I I I I 1 I I I 25- •- ---------- 1--- -L-- - - - - -L - ----- -I- - -- ---- 1---- '---- 1-- - -,-- -- 1 I I I I 1 I I I 1 I I I 20:' .- ___J____ L___ J____L__- J____L 10 --- 1-- --r - -- 1-- - -r - -- 1 - - -- -- -- - -r - -- I---- r--- T-- - -r - -- I - - -- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type 11 24 -hr 10 -YR Rainfall = 5.38" Prepared by BASS, NIXON & KENNEDY, INC. Page 10 HydroCAD® 8.00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:01 PM Pond 1 P: 90% TSS WETPOND Inflow Area = 15.446 ac, Inflow Depth > 3.58" for 10 -YR event Inflow = 97.62 cfs @ 11.97 hrs, Volume= 4.603 of Outflow = 29.69 cfs @ 12.11 hrs, Volume= 3.376 af, Atten= 70 %, Lag= 8.7 min Primary - 23.48 cfs @ 12.11 hrs, Volume = 3.334 of Secondary = 6.21 cfs @ 12.11 hrs, Volume= 0.042 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 378.67' @ 12.11 hrs Surf.Area= 25,677 sf Storage= 99,849 cf Plug -Flow detention time= 117.2 min calculated for 3.376 of (73% of inflow) Center -of -Mass det. time= 54.5 min ( 817.0 - 762.6 ) Volume Invert Avail.Storage Storage Description #1 374.00' 147,067 cf Stage /Storage Data (Prismatic) Listed below Elevation Surf.Area Inc.Store Cum.Store (feet) (sq -ft) (cubic -feet) (cubic -feet) 374.00 16,500 0 0 374.50 18,250 8,688 8,688 375.00 19,000 9,313 18,000 376.00 20,740 19,870 37,870 377.00 22,540 21,640 59,510 378.00 24,400 23,470 82,980 379.00 26,320 25,360 108,340 380.00 28,310 27,315 135,655 380.40 28,750 11,412 147,067 Device Routing Invert Outlet Devices #1 Primary 365.90' 15.0" x 79.9' long Culvert RCP, groove end projecting, Ke= 0.200 Outlet Invert= 360.00' S= 0.0738T Cc= 0.900 n= 0.013 #2 Device 1 376.65' 48.0" Horiz. Standpipe Limited to weir flow C= 0.600 #3 Device 1 374.00' 2.5" Vert. Orifice C= 0.600 #4 Secondary 378.55' 50.0' long Sharp- Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max =23.47 cfs @ 12.11 hrs HW= 378.65' (Free Discharge) t- = Culvert (Barrel Controls 23.47 cfs @ 19.13 fps) =Standpipe (Passes < 85.56 cfs potential flow) 3 Orifice (Passes < 0.35 cfs potential flow) Secondary OutFlow Max =5.33 cfs @ 12.11 hrs HW= 378.65' (Free Discharge) 'L4= Sharp- Crested Rectangular Weir (Weir Controls 5.33 cfs @ 1.04 fps) RA2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type// 24 -hr 10 -YR Rainfall= 5.38" Prepared by BASS, NIXON & KENNEDY, INC. Page 11 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:01 PM Pond 1 P: 90% TSS WETPOND Hydrograph 1 I 1 I 1 I 1 I I I I - -— � — -- LOW= ------------ - - - -I I 1 I I 9762 cfs I i(IOW L L___LLInf1owrArc'a=- 1.5A46 -ac -- maryr- --rr--- r- - -r I r r condary ' ' -' _L___L_ _L___L_ -L_ -L_ _L___L _L_ - L___L_ L L_ _ 105" � ,- -- - - - -- - ' Reak- Elev =378 67'- - 100 -;',. � ,---- r--- r--- r--- r--- r - - -r- - -r - - -r ■ ' -''' - - L - - - L - - - L--- L -- -L - - -� I- -L---L---L---L---L---L--- 95=' , , . , -- - ., -I -- ' 1 9U ',' , ------------- - -� - -- - --- �Stbra §e= 99;8491cf- I 80-' .',' �'. - - -I --- r--- 1---- I - - - -r- -- -r - - -I -- -r - - -� --- r- - -r - -- : ., ,' 75' ,--- - r - - - r - - - r - - - r - - -r -r- -r---r - - - r - - - r - - - r---r---r--- 70- ���/ I I I I I 1 I I 1 1 I 1 r--- 1 r--- 65" ., .---- r - - - r - - - r - - - r - - -r- r- - - r - - - r - - - r ---r --- N ' ' ' ' --- L--- L - - - L - - - L --- L ---L- -L---L---L - - - L - - -L---L - --L - - - �V.. 60 ,',' /',' - I I I I 55: . ' r--- r--- r--- r-- -r - - -r r---r---r---r---r---r---r--- ' ' - -L - - -L - - - � - - -� -- -L - - -' --- L-- -L - - -� - - -' - - -' - - -' - - -� - -- O 50 :' ,','��-- I I I I I I I I I I I 1 LL 45- .•--- F-- -1---- f----1- ---F -1 -29.69 cfs --- 1- ---F ---F ---�--- +----- - -�- -- -- -' --- L - - -Lr -- -L - - -' -- -L --- L --- L --- L - - -L --- 40 . ' •- -- 1 r -- I I I I I 1 I 1 I I I 35 •-- I 1 I 1 1 23.48 cfs 30. ' , - - -- - - -- -- F - -- -- - - -- - - -- - - -- -- 25- L 20. ' 10: ',' 6.21 cfs 5 6 7 8 9 10 '11 12 13 14 15 16 17 18 19 20 Time (hours) R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type 11 24 -hr 25 -YR Rainfall= 6.41" Prepared by BASS, NIXON & KENNEDY, INC. Page 12 HydroCADO 8.00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:02 PM Subcatchment 1S: TO BASIN Runoff = 120.96 cfs @ 11.96 hrs, Volume= 5.791 af, Depth> 4.50" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 25 -YR Rainfall= 6.41" Area (sf) CN Description 322,680 74 On >75% Grass cover, Good, HSG C 9,306 74 Off >75% Grass cover, Good, HSG C 332,527 98 On Paved parking & roofs 8,335 98 Off Paved parking & roofs 672,848 86 Weighted Average 331,986 Pervious Area 340,862 Impervious Area Tc Length Slope min) (feet) (ft/ft) 6.0 Capacity Description Direct Entry, TR65 MIN Subcatchment 1S: TO BASIN Hydrograph I I I 1 I I I I I 1 I 1 • .' I I I I I I I I 1 I I I I I 130_' I I I 1 I I I I I 1 I ---- 1--- -- I---- I----- •-I- - -- 120.96 cfs - - - a - --- I ---- -�---- I----- I--- -I- -- -� - - -- -� I I I I I 120' I I I I 1 1 1 '1 -� 1 I 1 I I I 1 I I l oo /�I r 1 I��a p��1�I •/�I� 09 Ru nff- /Ar6a =672- 100- 1 1 I I I I I I I I 1 I I I I I I I I I - 90. I I I I I 1 1 I I I I I I I 1 I - -- I- --- r---- I-- - -r - -- - - - -r- -- Rull)off,VnA�JJ697�',=5.:7��I R _ 80 lA -' - - - -.- - - -- 42 I I I 1 1 I I 70, I I I I 1 I 1 Tc -6' 0 nd i n �. 60, 1 I I I 1 I I I 1 I 50- ' I I I I I I I I I I I I 40- •� I 1 1 I I I I 1 1 I I I i 30- 20- I I 11 12 13 14 15 16 17 18 19 20 Time (hours) D Runoff R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type 1124 -hr 25 -YR Rainfall = 6.41" Prepared by BASS, NIXON & KENNEDY, INC. Page 13 HydroCADO 8.00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:02 PM Pond 1 P: 90% TSS WETPOND [82] Warning: Early inflow requires earlier time span Inflow Area = 15.446 ac, Inflow Depth > 4.50" for Inflow = 120.96 cfs @ 11.96 hrs, Volume= Outflow = 82.19 cfs @ 12.05 hrs, Volume= Primary = 23.74 cfs @ 12.05 hrs, Volume= Secondary = 58.45 cfs @ 12.05 hrs, Volume= 25 -YR event 5.791 of 4.556 af, Atten= 32 %, Lag= 5.2 min 3.914 of 0.642 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 379.06'@ 12.05 hrs Surf.Area= 26,428 sf Storage= 109,826 cf Plug -Flow detention time= 105.1 min calculated for 4.556 of (79% of inflow) Center -of -Mass det. time= 48.7 min ( 806.1 - 757.4 ) Volume Invert Avail.Storage Storage Description #1 374.00' 147,067 cf Stage /Storage Data (Prismatic) Listed below Elevation Surf.Area Inc.Store Cum.Store (feet) (sq -ft) (cubic -feet) (cubic -feet) 374.00 16,500 0 0 374.50 18,250 8,688 8,688 375.00 19,000 9,313 18,000 376.00 20,740 19,870 37,870 377.00 22,540 21,640 59,510 378.00 24,400 23,470 82,980 379.00 26,320 25,360 108,340 380.00 28,310 27,315 135,655 380.40 28,750 11,412 147,067 Device Routing Invert Outlet Devices #1 Primary 365.90' 15.0" x 79.9' long Culvert RCP, groove end projecting, Ke= 0.200 Outlet Invert= 360.00' S= 0.0738'/' Cc= 0.900 n= 0.013 #2 Device 1 376.65' 48.0" Horiz. Standpipe Limited to weir flow C=0.600 #3 Device 1 374.00' 2.5" Vert. Orifice C= 0.600 #4 Secondary 378.55' 50.0' long Sharp- Crested Rectangular Woh, 2 End Contraction(s) Primary OutFlow Max =23.74 cfs @ 12.05 hrs HW= 379.05' (Free Discharge) 't-- = Culvert (Barrel Controls 23.74 cfs @ 19.34 fps) L2 =Standpipe (Passes < 93.71 cfs potential flow) 3 Orifice (Passes < 0.36 cfs potential flow) econdary OutFlow Max =57.58 cfs @ 12.05 hrs HW= 379.05' (Free Discharge) = Sharp- Crested Rectangular Weir (Weir Controls 57.58 cfs @ 2.31 fps) R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type 1124 -hr 25 -YR Rainfall= 6.41" Prepared by BASS, NIXON & KENNEDY, INC. Page 14 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:02 PM / 130 , 120= 110 -•� .' 100 90 80. 70. / 0 60= ' L ' 50: / 40. 30' .' 20_' .' Pond 1 P: 90% TSS WETPOND Hydrocdraph I 1 I I I I I 1 I I I I 1 1 1 1 1 I I 1 1 I I ■ Inflow - - -' --- '---- '-- - -' - -- ' - El Outflow I 1 1 I I Inflow Area =1.5.4;.46 ■ Primary 19 20 _ _I -ate _ El Secondary I I I 1 1 I ; ; 1 I I 1 I I I - -; - - -� Peak -EIeV =379:05' - - - -; - - - ; - - - ; - --; - - - - - - - - I I i I 1 I I I I I I - - -1 - -- - -- - -- - -- - - -�- 1 1 1 I I 1 I I - -- --- St6tago=109;826-;cf - 1 1 1 ! -- -' - - -' - - - -- -I - - -� I I I 1 I 82.18 cf' I I I 1 I I I L-- _ L --- L _ _ _ L - _ _ L- _ _ L I --- L --- L --- L _ _ _ L _ _ _ L - _ _ L - _ _ 1 I 1 I I I --- r--- r------ r-- -r - - -r I I I 1 I I I ---r---r---r---,----r---r---r--- 1 1 I 1 I I I I I I I 11 L I 1 1 1 I I I I I 1 1 I I I I I I I - -- r' - - r - - - r---r- 58.45c {y I 1 1 1 I 1 I -'-r---r---r---r---r---r---r--- I I I 1 I I I I I I 1 I L_ _ _ L _ _ _ L _ _ _ 1 I I I I I I I I I 1 I I I I I I I I 1 I I 1 1 I 1 I 1 I I I I I I I 1 1 I I I I 1 1 I I I 1 I I 1 1 I I 5 0 7 0 9 10 11 12 Time (horn's) 14 15 16 '17 3 19 20 R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type// 24 -hr 100 -YR Rainfall= 8.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 15 HydroCAD ®8 00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:02 PM Subcatchment IS: TO BASIN Runoff = 156.82 cfs @ 11.96 hrs, Volume= 7.643 af, Depth> 5.94" Runoff by SCS TR -20 method, UH =SCS, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Type II 24 -hr 100 -YR Rainfall = 8.00" Area (sf) CN Description 322,680 74 On >75% Grass cover, Good, HSG C 9,306 74 Off >75% Grass cover, Good, HSG C 332,527 98 On Paved parking & roofs 8,335 98 Off Paved parking & roofs 672,848 86 Weighted Average 331,986 140-:' Pervious Area 340,862 Impervious Area Tc Length Slope Velocity Capacity Description in) (feet) (ft/ft) (ft/sec) (cfs) 6.0 Direct Entry, TR55 MIN Subcatchment 1S: TO BASIN Hydrograph 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) 170: 160- ' I I I I I I I I 1 I I I I I 1 1 6- .8 2 u1 I 1-- - -- - -- -- - - - --I -!' e 0 ---- -- --- -- ---- ❑ RUlloff - -_- -- -: 150 ' i," - _ I � -.=-0- �I 1 � - - 'I -- - ---- -- I 1 1 --C - -R - i -- 1 --- _ I I I I I I 1 4 Rai nfall- 0R " 140-:' ----- --- 1'I -------- -5 - 1 - r r - - - r - -- - 130 , . I I - ; I - - - - - - - - - - --I ; - - - ;I - , ; I R-u- u-n1 o-ff- f'lI ir-l�I a- sa- f ---I , ---I ; ;o� I --- - 1207 = - I6S - - - - -- - 1 - - - ---- - - - - II -- -- ---, -- I - -m�- --44- - - �1 " �I -Al-o- -- - -- 110 = , ' RI 1 I I u O� ��-7�-- 3�-a f- - ---- - - - - - - - o- f I — , o D- °° - p- th6t1 4If01I n------- 90" - 1 -- LL100: 7 80 h5- 1 � -�e,I C 9�. - --R-u-- I 70 . 1�I -------- - L 60- -j- L - - - - - - -� -- - - - - -� - --- s--- -I -- - -' I- - - - - -- '-- - - - - -- I 50- 1 1 I I I I I 1 I 1 I I 407 1 I I I 1 I I 1 I I 30 - "' I 1 I I 1 I 1 I 1 1 I I I I I •' 20 =" I I I I I 1 I I 1 -- - - - - -� ---- ' - - - -� -- - - - - -� -----'--------'----s----I-----'---- 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Time (hours) R:\2012- 03jobs \l219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks MaF - WETPOND ROUTING Type 11 24 -hr 100 -YR Rainfall = 8.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 16 HydroCADO 8.00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:02 PM Pond 1 P: 90% TSS WETPOND [82] Warning: Early inflow requires earlier time span Inflow Area = 15.446 ac, Inflow Depth > 5.94" for 100 -YR event Inflow = 156.82 cfs @ 11.96 hrs, Volume= 7.643 of Outflow = 141.63 cfs @ 12.01 hrs, Volume= 6.399 af, Atten= 10 %, Lag= 2.8 min Primary = 23.94 cfs @ 12.01 hrs, Volume= 4.767 of Secondary = 117.69 cfs @ 12.01 hrs, Volume= 1.632 of Routing by Stor -Ind method, Time Span= 5.00 -20.00 hrs, dt= 0.05 hrs Peak Elev= 379.36'@ 12.01 hrs Surf.Area= 27,027 sf Storage= 118,049 cf Plug -Flow detention time= 92.5 min calculated for 6.398 of (84% of inflow) Center -of -Mass det. time= 44.1 min ( 795.7 - 751.6 ) Volume Invert Avail Storage Storage Description #1 374.00' 147,067 cf Stage /Storage Data (Prismatic) Listed below Elevation Surf.Area Inc.Store Cum.Store (feet) (sq -ft) (cubic -feet) (cubic -feet) 374.00 16,500 0 0 374.50 18,250 8,688 8,688 375.00 19,000 9,313 18,000 376.00 20,740 19,870 37,870 377.00 22,540 21,640 59,510 378.00 24,400 23,470 82,980 379.00 26,320 25,360 108,340 380.00 28,310 27,315 135,655 380.40 28,750 11,412 147,067 Device Routing Invert Outlet Devices #1 Primary 365.90' 15.0" x 79.9' long Culvert RCP, groove end projecting, Ke= 0.200 Outlet Invert= 360.00' S= 0.0738'/' Cc= 0.900 n= 0.013 #2 Device 1 376.65' 48.0" Horiz. Standpipe Limited to weir flow C= 0.600 #3 Device 1 374.00' 2.5" Vert. Orifice C= 0.600 #4 Secondary 378.55' 50.0' long Sharp- Crested Rectangular Weir 2 End Contraction(s) Primary OutFlow Max =23.93 cfs @ 12.01 hrs HW= 379.33' (Free Discharge) 't-17-Culvert (Barrel Controls 23.93 cfs @ 19.50 fps) =Standpipe (Passes < 99.08 cfs potential flow) 3 Orifice (Passes < 0.38 cfs potential flow) Secondary OutFlow Max = 112.78 cfs @ 12.01 hrs HW= 379.33' (Free Discharge) 't4= Sharp- Crested Rectangular Weir (Weir Controls 112.78 cfs @ 2.89 fps) R:\2012- 03jobs \1219100R - Wilson Road \Calculations \05 Detention\ The Woods at Fairbanks tWaF - WETPOND ROUTING Type 11 24 -hr 100 -YR Rainfall= 8.00" Prepared by BASS, NIXON & KENNEDY, INC. Page 17 HydroCAD® 8.00 s/n 004300 © 2006 HydroCAD Software Solutions LLC 10/14/2013 1:16:02 PM Pond 1P: 90% TSS WETPOND Hydrograph 1 I 1 I .---- r--- r--- r--- r--- r--- r--- r--- r-- -r - - -r ---r---r---r---r--- ■ Inflow --- r--- r--- r--- r - - -r -- 158.82 cfs --- r--- r--- r--- r--- r--- r- - -r - -- 13 Outflow ' .' --- r--- r--- r---r---r -- -r- , , I I I I , -- r r -1-5-4 - `dc ■Primary ' I nfIdW I refa- . 0 Secondary 170 =. - - -i --- , - - - -i - - -� -- -� - - -, -, - - -i -,1 , -- - - -i - - , - - - -i _ - ' 141.63 Us I 1 1 I - --r Peak-Elev-r379-.36-- 160= --- ,---- ,---- ,---- ,- - - -,-- � I 1 --- -� -- - - - -� --- - - - -� - - -� 150- . ' • ' I I I I I r 1 I = - -� - - -L - - -L - - -L - - -L - - -L _ - - - - -&toi ago_ =_1' - 8.,949 1, - 140 -" -- - - ,' ,' ''---L---L -- -L--- L-- -� ---I ---L---L---L---L---L---L---L--- 130- I_L I ---- L - - - L - - - L - - -L- 117.G9c1s - -- _L___L___L_______L_-- - 120 =' ' : / , ----L --- L --- L --- L --- L - _ _ _ L _ _ _ L _ _ _ L---L _ _ _ L --- L _ - _ L --- 110 - ,' ,' , I 1 1 I 1 i �� I I 1 1 I 1 I L___L___ L___L 100-:, , .-. ' ' ' ,---- 1'-- -I------- r'- - -1- - ----- 1'--- F--- F--- �'----- -1- - -- 90- O 80' , 70- 50= ',, ---- r--- r--- r- - -r - -- �� c--r---r---r---r---r---r---r- , 40 =' --- r--- r--- r-- -r - - -1 cfs I % >i/ \ -I - -. .L. -r---r---r---r---r--- 1 I 30c' ,'',' 20: ' 109 i i.. i r13 SIT 5 6 7 a 9 10 11 12 14 15 16 17 18 19 20 Time (hours) AMMI NCDENR Permit 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 Ii/) must be printed, filled out and submitted along with all of life required Infornfallon. I. PROJECT INFORMATION Project name The Woods at Fairbanks Contact person Danny Howell, PE Phone number (919) 851 -4422 Date 9/27/2013 Drainage area number 2 (to be provided by D14/Q) o�OF W A T�c9QG �i o II. DESIGN INFORMATION Site Characteristics y (Y or N) Drainage area 672,840 fie Impervious area, post - development 340,062 fie %impervious 50.66 % Design rainfall depth 1.5111 Storage Volume: Non -SA Waters Minimum volume required fe Volume provided to Storage Volume: SA Waters 1.5' runoff volume 42,552 fl' Pre - development 1 -yr, 24 -hr runoff 44,910 ft' Post - development 1 -yr, 24 -hr runoff 100,041 ff' Minimum volume required 55,931 ft' Volume provided 55,950 If Peak Flow Calculations Is file pre /post control of the lyr 24hr storms peals flow required? y (Y or N) 1 -yr, 24 -hr rainfall depth 3.0 in Rational C, pre - development n/a (unitless) Rational C, post - development n/a (unitless) Rainfall Intensity: l -yr, 24 -hr storm n/a in/hr OK Pre - development 1 -yr, 24 -1u peals flow 16.40 fl' /sec Post - development 1 -yr, 24 -11r peak flow 52.25 fe /sec Pre /Post'l -yr, 24 -hr peals flow control 35.05 ft' /sec Elevations Temporary pool elevation 376.22 fmsl Permanent pool elevation 374.00 fmsl SHWT elevation (approx. at the perm. pool elevation) 374.00 fmsl Top of 10ft vegetated shelf elevation 374.50 fmsl Bottom of 10ft vegetated shelf elevation 373.50 fnisl Sediment cleanout, top elevation (bottom of pond) 366.00 fnisl Sediment cleanout, bottom elevation 365.00 fnisl Sediment storage provided 1.00 ft Is there additional volume stored above the state- required temp. pool? y (Y or N) Elevation of the lop of the additional volume 376.2 fmsl OK Form SW401 -Wet Detention Basin- Rev.9- 4/18112 Parts I. & II. Design summary, Page 1 of 2 Permit II. DESIGN INFORMATION Surface Areas Area, temporary pool 128,000 fe 3 :1 Area REQUIRED, permanent pool 16,485 fe SAIDA ratio 2.45 (unilless) Vegetated shelf width Area PROVIDED, permanent pool, A „,„_,w 16,500 ill OK Area, bottom of 10ft vegetated shelf, Abq rnEn 14,320 fe 3 :1 Area, sediment cleanoul, lop elevation (bottom of pond), Ab,4_.j 6,590 ill Volumes OK Trash rack for overflow & orifice? Volume, temporary pool 55,950 f(' 01( Volume, permanent pool, V,m_p” 88,798 ft' 1.0 ft Volume, forebay (sum of forebays if more than one forebay) 10,480 fi' N Forebay % of permanent pool volume 20.8% % 0K SAIDA Table Data (Y or N) OK Design TSS removal 90 % (Y or N) Coastal SAIDA Table Used? N (Y or N) Gale Valve Mountain/Piedmont SAIDA Table Used? Y (Y or N) SAIDA ratio 2.45 (unilless) Average depth (used in SAIDA table): Calculation option 1 used? (See Figure 10 -2b) N (Y or N) Volume, permanent pool, VP,._,m 88,798 fly Area provided, permanent pool, A,,-Pw 16,500 its Average depth calculated 5.21 it OK Average depth used in SAIDA, d,y, (Round to nearest 0.5f1) 5.2 ft 0K Calculation option 2 used? (See Figure 10 -2b) Y (Y or N) Area provided, permanent pool, Ape,n_j�d 16,500 ftZ Area, bottom of 10ft vegetated shelf, Aw sh,41 14,320 fe Area, sediment cleanoul, lop elevation (bottom of pond), Am_,„ a 6,590 fe "Depth" (distance b/w bottom of 10ft shelf and top of sediment) 7.50 it Average depth calculated 5.21 It 0K Average depth used In SAIDA, d,,, (Round to down to nearest 0.58) 5.2 It 0K Drawdown Calculations Drawdown through orifice? Y (Y or N) Diameter of orifice (if circular) 2.50 In Area of orifice (if -non- circular) In' Coefficient of discharge (Cu) 0.60 (unilless) Driving head (H ") 2.25 it Drawdown through weir? N (Y or N) Weir type (unilless) Coefficient of discharge (C,,,) (unilless) Length of weir (L) ft Driving head (H) it Pre - development 1 -yr, 24 -hr peak flow 16.40 ft' /sec Post- development 1 -yr, 24 -hr peak flow 54.74 ft'lsec Storage volume discharge rate (through discharge orifice or weir) 0.14 ft'/sec Storage volume drawdown time 3.46 days OK, draws down in 2 -5 days. Additional Information Vegetated side slopes 3 :1 0K Vegetated shelf slope 10 :1 OK Vegetated shelf width 10.0 it OK Length of flowpath to width ratio 3 :1 OK Length to width ratio 3.0 :1 OK Trash rack for overflow & orifice? Y (Y or N) OK Freeboard provided 1.0 ft OK Vegetated filler provided? N (Y or N) OK Recorded drainage easement provided? Y (Y or N) OK Capures all runoff at ultimate build -out? Y (Y or N) OK Drain mechanism for maintenance or emergencies is: Gale Valve (/o be provided by D14/Q) Form SW401 -Wet Detention Basin- Rev.9- 4 /1e /12 Paris I. & 11. Design Summary, Page 2 of 2 MAPS EXISTING DRAINAGE AREA MAP PROPOSED DRAINAGE AREA MAP WAKE COUNTY SOILS MAP USGS QUAD MAP FEMA FIRM MAP The Woods at Fairbanks November 12 2013 lil, l,�+nlu ")IM -1y, rl0101I c;AN01114n ;iiu'I'r rnimjlld? /IJi 1 (luinc silr.ul :friJ glll I � I ,.• 1 � ' � J i r 'III: , 1 1 . �,1 1 I " ! � •'' ' , i ' ! .III •. , ,, 1 \ I I A r • t 1 ' I' i 1 �I ' I In t I `r (I r r 1 i Illnr r I! . RII 1.11�� �, � , iI 11, ,1 . \'I •1 J'',r ,' I •' rl I •' � '1 1y ' I II I 1 ' I 141 I'. !' t • { � '} ,, r „1 „1 ''A r„ I 1 r:u + / II ! ''+ ,I '� � Liili tl+, ,'t''' t •I '- '1 I 1.I I '•� i ` II j I,:t•u:' / i 'i J I f 1� I t Ij. .1 } rill I I ,, Ir /j, `'.111 •,�� /I JI 1 'r 1 ll I �r��ll 'I' ' I I i .1 ' i. , ' , ' � tl'I J � 1 , jI� i � ) � \ 1• 1 •,' ; 'r. 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't,t(I,1i� I��,I,lif (iti•{;• { lfli; � I_ : 1 : ; `��11;♦�I 1'�il,��l'�(�� , �4'r it {li(! ii f �f N! rr X11; � S tl � t Ilill ( ,j III t1jlll f!� j� I►I f�l�ll �( ►s'� i��1 lit l( 1 ifs rit ?I li }1 ifl }If� it !!I (I(Q ;iii off 1 U- ?I ,f��lj ;cf11i; 11�� { )1rif�i flil 11 (,rf rl�lNo �fl(1!► {r1r )I l.ali {11ij� I,Irrfli,�l,, irlr,;c J'— LI,f1 i1i t`{ .E' i I1�I�r� II �r<<r� I� ►11 ( \l]�fnhu'�t�;':Illl�:c "ti. ,��,; .6eUliiUlrluii�ii It;U111i'�,l�c: Ill lld►InlUlliuu ; n Agltuil n'ddgnnuiii; I � 'I • 'onlrcl Ily M I I!nlu , 1 l;lwlatrtl Onlo .uridloll , c -lluck orur I`' I I'lu;ont I I I ►t:vtaoped 'L li il�litl" liil •(�IUII,'A'!lult'Irili•I:II• Boil l►(uuo Coval' (I( ►I.rl'II ►iI( ►11 t %III Area Product hydrologic of ("N x III-cm group � � ��� t, I• (Hera, (cover lypo, Ilomlmrml, and hydrolollir, condillon; pelronl I!I (nppondix A) Impolvlolm; unrunnrclydreannrcicd bnpolvlolm awa I;luo) i;,l I8, �►�I''t'.,11�(I I.I � ��II►r,, ,.• (I�I�I I(1 cJ,l'I,•;. ,; ; , �; .1,_� �' - - -- - -''! - !' - - -1- -•�, , ' ( r I/ Uso only ono CPI soul-co per Ilno 1 f�•l�ill;i I r� I 'f .IhI I I ���� ,jt / CIV (w(lglil(;(1) -• Mal hl•o(ltict ,, �Ic)II11 I(I iloflll 11% Frogllo'licy ................................................. yr I1t111►((111,1- 1(7.11.1lolu') r.. ill Illtlol1, (.1 .,..,,....rr. r.rrr. ...........•......•............ iu (Il;;o I' It nd Cld wilh Inblo ?. -I, Illpno 7.• I, or rrliinllnn:, !;1 and 2•�I) 1 II WihU)i')�l;' lllla;r.'lII. ,,,, l(�.dIIIIIIQUII'll' Il;lllll►'�1t1'! I111lIlllIIIIII�UU:u „Igllni� li'dillilLaUilli t),lccl I ly ocollol1 (fiurl(ml I > Iln (:Ilock olio; I 11'rot:olll I I I ovelol)otl ' II.. I; 1IIIVI--iI1'i'(u)Ij119,1 .!1,,IVI blil:II. ;rlil 111m1u (;ov(n' clasrl'll)Ilrn► hI " Aron I )rodllul 1111d I lydrololllo of of CPI x (Dolt clmul) (COVta' ly1)o, IfOnlllltall, (111(1 Ily(llolRl►lu c011111111111; I)IlfCCnl IIll2 (I ppon111R A) Illll)I:IV10113 11111; t11111L'(. ICII /C011111lCIt;ll lllll)olvlolill area 111110) C) 0 C .1" ji llso only 0110 CPI mtirw 1)01' (111(1 ' CN (V,r( lghlO(I) (oli.11 l)I'011llC( total 1.11 o"a �,Ii;lllllU��llll' i101'I'll ��'I ilol'Ill ill $101'111113 I'(1(lll()I1Cy .................. ............................... yl. 1111111fall, I (211- Iloln') ... ............................... iu 11111lol(, Q ................... ............................... it l (Uso P Intl (:hl vdill 111blo 2- I, Ihluro 2- I, of c(Iunllons 2d3 told 2.4) ��Il�llhu'I�IY�Itp {I '1:'111. i�,;; �I;�IIIllipllllllll d;dllll'�/ff'; II II II IIIIgllllu4911' ..:Illlllll� IL'IIIIIIUIlUl1111` 'iulc: I I{y iu ;illnl� Clu:r,kal 0luck ol►o: I I "I'mol 11 I )ovolopud ll.li'illliil ).iiif�►ull�'A: If, lulhllLI:I►' "oil ImIlll) Covr.1' clola;lihllou and hyclrolocllo (11'1)111) c.i (covf ►l• typo, [Icilllnalll, inul I►yduilollla cond!Ilon; prlr(:ul i I" (appandixA) In) pul Viol I'; III col) Imc .Icd /connrcicdlnlp(lnrloliaal lll.1llc) W� j/ Uso only ono ON col Ifco por Zino 1011.11 hI'cxl!!rt ; totill area I hllu 1).rlo Aron I" Iacros m �� I I Ali'• I • i USCa (; I�l ............. y r Ilrlllllc.11l, I'( %�) 110111') ,.. 111111oll, (,I .................. ........................ „,,..,, it (Oso I' and Chl l'rllll lablo 2 I, Iilplro 2 I, o► PI'o1111c1 of GN X aroil Storm IN Storill III Storm 113 I I.:;. I Ii- pollnualt of AIIIIi•ullrni: I I •I I'll;. 2111 I�I:IIIII +II Ib::���111C�::: (;Ullal'IV:Illi�ll :;cl \�I�:�, Illi ►111 il•'. I�!iil�lc►Vlt:;llc c�f,a; 'IIV►IC:'r�s t;clti�:r`k10, J61111 ell i,l;l`I(:I 9llilr. (VI� WllnoiI I\1o;t(I t;I11)(11 :;lolI 1)():;illn(:d I1y: I :11my I lowoll, IV. I l;ti( /.3'I /,W I.uc; Ohl I: 'Ittl)o Wilso11 Ito; 1(i (:II(:c:kc:cl I ltir, I >;uu►y I lovtiaal, I'I: I);If(:: 11111 /'I v. (Alock oll(): v� ('I'cl:;c:Ilf I)clVololl( :d (Aloc;l(ofl(:: V To I., 1111- olifIli ;;IIIrll'(t;l I'( ►)1!I NO 'l1:;;; !ol'rls 111011y rls 14110 solj►nc;► ►Is 1!014/ 1.)i1)0 c;;U►1>c� ►1:;0(11'0►' or►rl► t'v0►ks41a:l, 111011do n map, sr;11c;►►►.►Ik;, or dos01-1141o►► 0l'1lot4�;;c:(/nl(:►►1 t;llec;t How (Al)l►IIc�Ibln to •1'„ only) - - - -- — I. thU'r;(co closcrlpllon (•Pablo 3.d) ................. ....................I.......... Woods (I.) 1. M(.trltlitic)':� rouljhru:;;:, WWII! , II ('I'ahlc► ;1••'I) .............................. (lAO ;1. I•low k:nclll1, 1-. (lolnI I. ; -100 It) ............... ............................... ft IUO '1'wo••ycau• rafrtfall, I' z .................................................. in ;1.c1 ............... 6, hand (;lop(-)... ........................................ ............................... ( >, 'I'i ::!).0() (III.) o.o c ,on►ptIle) 'I'( .......................... ,jlj tllcw (;oitcch -clod How Y. ,;nrlace closcripllon (paved or IIl•Ipaved) .... ............................... 11. Flow 101101, I ........................................... ............................... It 9. WWel'coul'SO slope, s ............................ ............................... fi /fl -I O. nvarugo velocity, V O'Iflure ,t•• I) ........... ............................... Ph; — I'l.'II L. (;omplllo'I'( .........................Iu' - -- 3(:Oo V (;halmal Flow. segment IF) I -- - —L— - /.. Qoss secllonctl flo Ilion, a ................ I...............1..... ft, Welled porirrlolel', Pv, .......................... ............................... fl -14. I lydn-11111c I"Idlus, r • ,a, 00111 auto r ... ft I'\•, •16. Channel ;lapel . :: ............................. ............................... 'IO. Nlannirlg' "; I\1ouc)hrtess Ooeff., n ..... . ...... ... I ..... ... ... .,....,,,,..,..,. -17. V 'IMO x213 0112. (;omp(lte V ...................... IIh; rl 111. Flow 1(-,11 1111, I ........................................ ............................... conlpu10 '1' . ..... ............................... nr ;;(u►O v >O. W,Itersl►c:d or s(Ibnra;l'I'„ or 'I', (a(Icl 'I'( in ;;lc:p;; cV, -1'I, mid 'Il) :: I (),:",I -- 0,061l - -- - -- 11.8 - -- - - - - "1611 I _ .............................. ........................... III' I o, I II. :;. In lanlun l l (,I Allll4.nllnn, HoI111.11 1h" Auer , C(,1v; 1141lhl1:;I'Ivl(.0 11. 1 111 1 )..111 I vil'I (I:• ��� Il�fc)v It! .I(r.( >i.:(: hiII,w e1; 11h 0,,;) e11,'Ii,G;Mt:1 hllIIc (q,) I'rnlcrl: Wil:;oll kond ,;IIII(IIvlslon I )el:lltlnc:el H\,/: I I ):t111ly I hmill, 1'I: 1);11e1: '12/3.1/'12 I.elr,;liloll; .1 GOO Wil.;ol► kond (;luu:kod Ity:,1)'11Illy I lowdl, I'I: ( :I1(:(;k ollo: `, Ilro:;r11i1. ( J lowk of io: V/ .I.e: .I.I 11Ir )lull) :;1111;II'rtl NO'11:,�: . �l7tu;r►1'W n' s 111ru►,►i 118 1) //)0 WHI be; 11SOd /br a►url►1•Vo►ktil►c:uf, h)cl►uto n mop, schonI,►flo, 01' rloscl11*00 of 1/01•v sr;�111►r:nts. 1, mt How (Appllcnblo to'f'u only) I. 81111"'tco IIoi;cl'IpIhI1 ('I "Iblo 3••'1) .... . ... ......... ......... I .......... I ...... I'll 2. m"ImIllm's ronclhlu:.;:; cooff., It (TrIblo 3--.1) ............................. ;t. Flow Ic:Ilc,111t, I. (tolsll I. '10011) .............. ........ .......I................ it �L '114u1••yo�u' 2�1 Ito►u' r�lh'tl'all, I', .................. it l 1i I.c11ld :;lope; s ......... ............................... II /II (t, 'I'► ::!),00Y (Ill.) -O,ll Complllo '11 hr `-3hcdlow conceir"Iled [ "low )c:f)mor►t II ) Y, surface doscl'Ipllon (paved or ullpavc;(l) .... ............................... It. Flow 10110111, I ........................................... ............................... fl 0. Watel'COtJrsc slopo, s ............................ ............................... II /fl 10, nverago velorily, V (I Icµu'e a•• I) ........... ............................... fl/.; •I A', 1 (;omprlto 'I't ......................... hr 13600 V C;hrqllllel I :I0W 8ogillonl II ) ue ...... Il. (toss sc;cllonul Iov II' •ict. Welled perin►olel', PW ....... ................................. tl ICI. I lych'aullc radius, r a, con.►pule: r ... ft f',.r 'I(i. (Alannel slope, s ............................. ............................... II /(l *16, KIIIIIII-Ig's I�otlghnes Goo(f., rt ,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, V/. V:: 'IAD 1,21:1.112 Coolpt11c1 V ll /:; II '111. 1:10W Ic;11c)Ill, I ........................................ ............................... fl '10. 'I't :: 1. Comp( Ilo '1't ..... .........1,.................... Ill' ;3600 V 2.0. 0.1I01'shod or s111mros►'1'„ or'I't (acicl 'I't in slops G, 9'I, ;Intl 19, Woad:; (I) 0.110 '100 :t,(; 0,0116 0, .19 20.0 0,11:113 — 0.1u;_ G,() - 1,098 - (1.(Ni I 11,O!i I .....1►I' � 3).2,1. I),s, Orimilim:0 of A1III:.IIlllllo Fbillll'+il ( {caollL:o: 1:o11rrlv:111oll: ;clvlcn I I I IIR ;.!111 1 11;11111 .Ik", !i!; W(c11h:;lwol::3: Ti11W Ili I:c 1:16rdifll0 (11) mb',;vltl Ant. (41) I'rr*!( :I: WIIsoll Iron I i;IIh(Iivlsioll I);1111Ind Ily; 1) ;uuIy I hvdl,ll, 1'I I. w;III()II: I(1(1(1 Wilson l\10 ;Id (;Iloc:kc:Il Ily; I):uuiy l 1()vd101, 1'I: ;I lock of lo: 1.f I'ro:;c a It I )ovolol o Clloc:k olio: ✓ ,I.): .1.1 11Irol11J1 l 8111)(11o'I.I'(, #3 NO TVS: ;,pwo !o►' lls 111111)y "Is 11,110 mm ho ►IswN'ol' omd) Ivolkshool, 1►►rlUclo rl n►rlh, schr:►llrlllo, o1•rloscriptio1► of flow sey a lds. shc:c Flow (/�ppllcMAL, to 'I'o oily) 'Oflin :1'It II ) -I, Thrill'; doscripilon ('I'(IL)lo :1 1) ................. 2. M-11-111111o's I'olmhnoss coeff,, n ('I'rlhlo :34) :I, I -lowlencill), I. (told) I. ,100 fl) .............. ............................... fl 4, 'I'Wo••yeal' ;�lI- hour ralnl��ll, I), ................... ............................... in itI And slopo, :; ........................................ ............................... 11111. G. 'I', :T 0,007 (nl.) RO. ( :oln )ulo I' 111' I , fRD Al shallow Concelratod Flow ,�edn'ICnI II ) 7. 8111.8 co closcripiion (paved or unpaved) .... ............................... 11. I--low !0110!!'1, L . ........... ............................... it itWomowne SWIM, s ,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,I ..... I.................. fl /f1. At Avem9a v0locity, V (I gwv ;I•••I) ........... ............................... fl/s, 1 "I. I 1 , Complllc:.1.1 ......................... hr SOOO V 1I.-i nel Flow segment II ) '12., cross secll mw How'll'oa, a ................ ............................... fl' 9,3. Wolled perimeter, I 1 .......................... fl 14. Hyclraullc radius, I- � Q, Compute r ,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, f1. I -''v, '15. Ch"1111101 8!010, s ,,,,,,,,,,,,,,,,,,,,,,,,,,,,, ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, fl /It IO, fvlonninct's lionahnoss CoeQ n ............. ............................... V:: 1.419 r' ►'` S112 ('om )uto V 11 11;, glow Ic:l'Ic1t11. I ........................................ ............................... It 1`I, II ._I. - - -• compu1.o' I'1 ... ..... ........ .................... Iu' :3(iO(1 V �o, VI / :Ilol'shc:d 11101 11 (.-Idd ' I.1 Instep!; c1, -1.1,:111;1 '1') Wood:. (I.) 0,110 '1 Ou :1.(1 It I).J :I ,...,,.....Iii'