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Home My WebLink AboutSW3200401_17031-PH2 BMP Calcs 6-12-2020_20200612 STORMWATER BMP CALCULATIONS VILLAGE AT GRANITE QUARRY - PHASE 2 Granite Quarry, Rowan County, North Carolina Prepared for: LGI HOMES Contact: Jeff Webb 3037 Sherman Drive Lancaster, SC P. 844-566-4300 Prepared by: DPR Associates, Inc. 420 Hawthorne Lane Charlotte, NC 28204 P. 704-332-1204 F. 704-332-1210 www.dprassociates.net DPR Project No.: 17031 August 17, 2018 March 11, 2020 3-11-2020 _______________________ _____________________ DPR Associates, Inc. Hy V. Nguyen, PE TABLE OF CONTENTS I. NARRATIVE II. BMP SUMMARY III. BMP EXHIBITS AND CALCULATIONS - Vicinity Map and Aerial Photo - Pre-Development Drainage Map - Post-Development Drainage Map - Pre-Development TOC Map - TOC Calculations - Run-Off Curve Number - Soils Map IV. BMP DESIGN AND CALCULATIONS V. BMP HYDROGRAGH ANALYSIS - Hydrograph Summary Report - Hydrograph Pond Report - Hydrograph Report VI. APPENDIX T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2- BMP Narrative.doc Page 1 of 2 VILLAGE AT GRANITE QUARRY – PHASE 2 BMP STORMWATER DESIGN NARRATIVE DPR No. 17031 The enclosed package shows the results of the stormwater BMP design calculations for Phase 2 of Village at Granite subdivision. The development is in Granite Quarry, Rowan County, North Carolina, at 3040 Faith Road. The net site area is approximately +/‐108 acres and the existing conditions consist of covered buildings with pavement, open space and woods. This project’s proposed development will be a 132 lot single‐family residential subdivision in phase 2. This phase has two (2) proposed stormwater BMP facilities for the site, a wet pond and a sand filter. All were designed per the most recent NCDENR Stormwater design manual. Topographic maps and field observations were used to delineate the watershed basins and hydraulic path feeding into the study conveyance system. With this information, hydraulic lengths, time of concentrations (TOC), and basin slopes were determined for the pre‐developed conditions. TOC of 5 minutes was used for all post‐ developed conditions. The total impervious areas of the development were calculated. The composite curve numbers (CN) were calculated based on the hydrologic soil types and groups from the U.S. Department of Agriculture, SCS method for the pre‐developed and post‐developed conditions. Surface areas for all ponds were sized to handle the first‐inch of rainfall based on total impervious area of the watershed. The BMP facilities are designed to treat the 1st‐Inch of rainfall water quality volume using the Schueler simple method and to provide for channel protection using the 1‐year, 24‐hr storm. Modeling results indicate that 2‐year and 10‐year (24‐hr storm events, using SCS Method) release peak flow rates for the post‐development detention routed conditions are less than that of pre‐developed conditions. Refer to the detailed maps, calculations, results, and details as shown in this package and in the civil engineering subdivision plans. T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2- BMP Narrative.doc Page 2 of 2 Table 1: DRAINAGE AREAS: Basin No. Drainage Area Pre‐Developed (+/‐ Ac.) Drainage Area Post‐Developed (+/‐ Ac.) Phase 2 BMP #7 5.5 26.0 Phase 2 BMP #8 3.0 6.5 Phase 2 Temp BMP #9 2.5 ‐‐‐‐‐ Phase 2 Temp BMP #10 5.0 ‐‐‐‐‐ Phase 2 Temp. BMP #11 8.5 ‐‐‐‐‐ Phase 2 Temp BMP #12 5.0 ‐‐‐‐‐ Phase 2 Undetained Areas* 8.5 4.5 TABLE 2: PRE‐DEVELOPED DISCHARGES: 1 – Year (cfs) 2 ‐ Year (cfs) 10 ‐ Year (cfs) 25 ‐ Year (cfs) 50 ‐ Year (cfs) 100 ‐ Year (cfs) Phase 2 BMP #7 0.305 0.980 4.327 7.008 9.371 11.95 Phase 2 BMP #8 1.349 2.288 5.239 7.178 8.806 10.53 Phase 2 Temp BMP #9 0.970 2.649 3.799 5.214 6.397 7.649 Phase 2 Temp BMP #10 0.148 0.541 2.840 4.786 6.568 8.531 Phase 2 Temp. BMP #11 0.269 1.038 5.584 9.428 12.90 16.72 Phase 2 Temp BMP #12 0.486 1.220 4.301 6.613 8.619 10.79 Phase 2 Undetained Areas* 3.369 7.202 19.89 28.54 35.90 43.75 Total 4.416 9.464 29.98 45.98 60.21 75.70 TABLE 3: POST‐DEVELOPED DISCHARGES: 1 – Year (cfs) 2 ‐ Year (cfs) 10 ‐ Year (cfs) 25 ‐ Year (cfs) 50 ‐ Year (cfs) 100 ‐ Year (cfs) Phase 2 BMP #7 41.31 59.33 111.87 145.04 172.06 200.04 Phase 2 BMP #8 13.48 18.44 32.53 41.04 47.89 54.93 Phase 2 Undetained Areas* 5.168 7.953 16.30 21.65 26.17 30.90 Total 59.95 85.66 160.59 207.73 246.12 285.87 TABLE 4: ROUTED‐DEVELOPED DISCHARGES: 1 – Year (cfs) 2 ‐ Year (cfs) 10 ‐ Year (cfs) 25 ‐ Year (cfs) 50 ‐ Year (cfs) 100 ‐ Year (cfs) Phase 2 BMP #7 0.360 0.427 2.130 5.134 8.460 12.84 Phase 2 BMP #8 0.226 0.301 3.184 15.66 18.87 27.70 Phase 2 Undetained Areas* 5.168 7.953 16.30 21.65 26.17 30.90 Total 5.423 8.352 16.61 27.79 41.61 50.56 TABLE 5: ROUTED‐DEVELOPED DISCHARGES EVELATION: 1 ‐ Year 2 ‐ Year 10 ‐ Year 25 ‐ Year 50 ‐ Year 100 ‐ Year Phase 2 BMP #7 723.94’ 724.89’ 727.04’ 727.52’ 728.10’ 728.68’ Phase 2 BMP #8 733.79’ 734.50’ 735.45’ 735.81’ 736.23’ 736.57’ FEMA Elevation BMP #7 ‐‐‐‐‐ ‐‐‐‐‐ 727.00’ 727.50’ 728.00’ 728.50’ FEMA Elevation BMP #8 ‐‐‐‐‐ ‐‐‐‐‐ 731.00’ 732.00’ 732.25’ 732.50’ *Undetained areas include areas that are disturbed during construction but covered with grass in the final condition. III. BMP EXHIBITS AND CALCULATIONS - Vicinity Map and Arial Photo - Pre-Development Drainage Map - Post-Development Drainage Map - Pre-Development TOC Map - TOC Calculations - Run-Off Curve Number - Impervious Calculation - Soils Map Project: Village at Granite - Phase 2 DPR Job No.: 17031 Location: Granite Quarry, NC Page: 2 of 4 DPR ASSOCIATES TIME OF CONCENTRATION Prepared by: RJ Checked by: HN Date: 8-31-2018 EXISTING CONDITION - TIME OF CONCENTRATION BMP #7 SHEET FLOW: Surface Description = grass Manning's Roughness (n) = 0.24 Flow Length (ft) = 300 Slope (%) = 3.7 P-2yr (in.) = 3.12 T(t) (min.) =27.2 SHALLOW CONCENTRATED FLOW: Surface Description unpaved Flow Length (ft) = 350 Water Course Slope (%) = 6.60 Average Velocity (fps) =4.15 T(t) (min.) =1.4 CHANNEL FLOW: Average Channel Area (sf) =3.00 Bottom Width (ft) = 1 Hydraulic Radius =0.548 Side Slope (X:1) = 2 Flow Length (ft) = 260 Channel Slope (%) = 2 Depth (ft) = 1 Manning's Coefficient (n) = 0.048 Velocity (fps) =2.94 T(t) (min.) =1.5 T(t) Sum of Travel Time (min)= 30.1 Time =30 (min.) Hydraulic Length = 910 ft Basin Slope = 4.3 POST DEVELOPMENT - TIME OF CONCENTRATION BMP #7 Time =5 (min.) T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-TOC.xlsPlotted 8/29/2018 Sheet: 1 of 6 Project: Village at Granite - Phase 2 DPR Job No.: 17031 Location: Granite Quarry, NC Page: 2 of 4 DPR ASSOCIATES TIME OF CONCENTRATION Prepared by: RJ Checked by: HN Date: 8-31-2018 EXISTING CONDITION - TIME OF CONCENTRATION BMP #8 SHEET FLOW: Surface Description = grass Manning's Roughness (n) = 0.24 Flow Length (ft) = 290 Slope (%) = 6.9 P-2yr (in.) = 3.12 T(t) (min.) =20.6 CHANNEL FLOW: Average Channel Area (sf) =12.00 Bottom Width (ft) = 2 Hydraulic Radius =1.096 Side Slope (X:1) = 2 Flow Length (ft) = 340 Channel Slope (%) = 6.8 Depth (ft) = 2 Manning's Coefficient (n) = 0.048 Velocity (fps) =8.61 T(t) (min.) =0.7 T(t) Sum of Travel Time (min)= 21.3 Time =21 (min.) Hydraulic Length = 630 ft Basin Slope = 6.8 POST DEVELOPMENT - TIME OF CONCENTRATION BMP #8 Time =5 (min.) T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-TOC.xlsPlotted 8/29/2018 Sheet: 2 of 6 Project: Village at Granite - Phase 2 DPR Job No.: 17031 Location: Granite Quarry, NC Page: 2 of 4 DPR ASSOCIATES TIME OF CONCENTRATION Prepared by: RJ Checked by: HN Date: 8-31-2018 EXISTING CONDITION - TIME OF CONCENTRATION EC #9 SHEET FLOW: Surface Description = grass Manning's Roughness (n) = 0.24 Flow Length (ft) = 470 Slope (%) = 5.1 P-2yr (in.) = 3.12 T(t) (min.) =34.3 T(t) Sum of Travel Time (min)= 34.3 Time =34 (min.) Hydraulic Length = 470 ft Basin Slope = 5.1 T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-TOC.xlsPlotted 8/29/2018 Sheet: 3 of 6 Project: Village at Granite - Phase 2 DPR Job No.: 17031 Location: Granite Quarry, NC Page: 2 of 4 DPR ASSOCIATES TIME OF CONCENTRATION Prepared by: RJ Checked by: HN Date: 8-31-2018 EXISTING CONDITION - TIME OF CONCENTRATION EC #10 SHEET FLOW: Surface Description = grass Manning's Roughness (n) = 0.24 Flow Length (ft) = 550 Slope (%) = 6.4 P-2yr (in.) = 3.12 T(t) (min.) =35.6 T(t) Sum of Travel Time (min)= 35.6 Time =36 (min.) Hydraulic Length = 550 ft Basin Slope = 6.4 T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-TOC.xlsPlotted 8/29/2018 Sheet: 4 of 6 Project: Village at Granite - Phase 2 DPR Job No.: 17031 Location: Granite Quarry, NC Page: 2 of 4 DPR ASSOCIATES TIME OF CONCENTRATION Prepared by: RJ Checked by: HN Date: 8-31-2018 EXISTING CONDITION - TIME OF CONCENTRATION EC #11 SHEET FLOW: Surface Description = grass Manning's Roughness (n) = 0.24 Flow Length (ft) = 250 Slope (%) = 2.8 P-2yr (in.) = 3.12 T(t) (min.) =26.3 SHALLOW CONCENTRATED FLOW: Surface Description unpaved Flow Length (ft) = 180 Water Course Slope (%) = 3.33 Average Velocity (fps) =2.94 T(t) (min.) =1.0 CHANNEL FLOW: Average Channel Area (sf) =44.00 Bottom Width (ft) = 10 Hydraulic Radius =1.282 Side Slope (X:1) = 6 Flow Length (ft) = 680 Channel Slope (%) = 3.23 Depth (ft) = 2 Manning's Coefficient (n) = 0.048 Velocity (fps) =6.58 T(t) (min.) =1.7 T(t) Sum of Travel Time (min)= 29.0 Time =29 (min.) Hydraulic Length = 1110 ft Basin Slope = 3.1 T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-TOC.xlsPlotted 8/29/2018 Sheet: 5 of 6 Project: Village at Granite - Phase 2 DPR Job No.: 17031 Location: Granite Quarry, NC Page: 2 of 4 DPR ASSOCIATES TIME OF CONCENTRATION Prepared by: RJ Checked by: HN Date: 8-31-2018 EXISTING CONDITION - TIME OF CONCENTRATION EC #12 SHEET FLOW: Surface Description = grass Manning's Roughness (n) = 0.24 Flow Length (ft) = 500 Slope (%) = 5.6 P-2yr (in.) = 3.12 T(t) (min.) =34.7 T(t) Sum of Travel Time (min)= 34.7 Time =35 (min.) Hydraulic Length = 500 ft Basin Slope = 5.6 T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-TOC.xlsPlotted 8/29/2018 Sheet: 6 of 6 Project: Village at Granite - Phase 1 DPR Job #: 17031 Location: Granite Quarry, NC Impervious Calculation Prepared by: RJ Checked by: HVN Estimated Impervious Area Breakdown for Phase 2 BMP #7 Proposed 50' Wide Single Family Lots 2,810 sf x 105 lots………………………………………………..…………………………295,050 sq ft =6.77 ac (avg house pad 40' x 50' + 18' x 20lf Driveway + 5' x 20' sidewalk + 150 sf Patio + 200 sf Future Allocated BUA) 2,460 sf x 3.5 lots………………………………………………..……………………………8,840 sq ft =0.20 ac (avg house pad 40' x 50' + 18' x 20lf Driveway + 5' x 20' sidewalk) Proposed Streets: Typical Local Street, B/C-B/C (approx. 26' x 4,105 lf)…………………………………106,730 sq ft =2.45 ac Sidewalk (approx. 5' x 4,245 lf x 2)………………………….……………………….42,450 sq ft =0.97 ac Driveway within R/W (105 x 7' x 18 lf)……………………………………………………13,230 sq ft =0.30 ac Proposed Turnaround (1,420 sf x 2)……………………………………………………2,840 sq ft =0.07 ac Total Proposed Streets:165,250 sq ft =3.79 ac Total Impervious Area…………………………………………………………………….469,140 sq ft = 10.77 ac Total Net Site Area=…………………………………………….…………………………………………………..107.90 ac Phase 2 Site Area = …………………………………………….…………………………………………………..57.65 ac 26.00 ac Impervious Area Summary Imperv. Area % of Imp. Area of % of Imp. Area of % of Imp. Area of (Ac) Site Area Phase 2 Site Area BMP #5 WS Area Proprosed Lots 6.98 6.47% 12.10% 26.83% Proposed Streets 3.79 3.52% 6.58% 14.59% Total Imp. Area 10.77 9.98%18.68%41.42% BMP #7 Watershed Area = ………………..…………..………........…….…………………………………….. USED 43% IN DESIGN C:\DPR Dropbox\_Projects\Active\2017\17031 Village at Granite (Partial)\Phase 2\CALCS\BMP\Phase 2\17031-PH2-Impervious.xlsplotted: 6/12/2020 Sheet 1 of 1 Project: Village at Granite - Phase 1 DPR Job #: 17031 Location: Granite Quarry, NC Impervious Calculation Prepared by: RJ Checked by: HVN Estimated Impervious Area Breakdown for Phase 2 BMP #8 Proposed 50' Wide Single Family Lots 2,810 sf x 23 lots…………………………………..………………………………..60,415 sq ft =1.39 ac (avg house pad 40' x 50' + 18' x 20lf Driveway + 5' x 20' sidewalk + 150 sf Patio + 200 sf Future Allocated BUA) 2,350 sf x 0.5 lots…………………………………..………………………………..1,175 sq ft =0.03 ac (avg house pad 40' x 50'+ 150 sf Patio + 200 sf Future Allocated BUA) 350 sf x 3 lots…………………………………..………………………………..7,525 sq ft =0.17 ac (150 sf Patio + 200 sf Future Allocated BUA) Proposed Streets: Local Road, B/C-B/C (approx. 26' x 285 lf)………………..……………………………15,340 sq ft =0.35 ac Cul-De-Sac, B/C-B/C (approx. 7,720sq ft x 1)…………………………………………7,720 sq ft =0.18 ac Sidewalk (approx. 5' x 720 lf x 2)………………………….……………………….7,200 sq ft =0.17 ac Driveway within R/W (22 x 7' x 18 lf)……………………………………………………2,772 sq ft =0.06 ac Total Proposed Streets:33,032 sq ft =0.76 ac Total Impervious Area…………………………………………………………………….102,147 sq ft = 2.34 ac Total Net Site Area=…………………………………………….…………………………………………………..107.90 ac Phase 2 Site Area = …………………………………………….…………………………………………………..57.65 ac 6.50 ac Impervious Area Summary Imperv. Area % of Imp. Area of % of Imp. Area of % of Imp. Area of (Ac) Site Area Phase 2 Site Area BMP #8 WS Area Proprosed Lots 1.39 1.29% 2.41% 21.34% Proposed Streets 0.76 0.70% 1.32% 11.67% Total Imp. Area 2.15 1.99%3.72%33.00% BMP #8 Watershed Area = ………………..…………..………........…….…………………………………….. USED 36% IN DESIGN C:\DPR Dropbox\_Projects\Active\2017\17031 Village at Granite (Partial)\Phase 2\CALCS\BMP\Phase 2\17031-PH2-Impervious.xlsplotted: 6/12/2020 Sheet 1 of 1 Project: Village at Granite -Phse 2DPR Job No.: 17031Location: Granite Quarry, NCDPR ASSOCIATES, INCRUN-OFF CURVE NUMBERPrepared by: RJChecked by: HNDate: 8-31-20187Total Drain. Area (Ac.)5.50Site Soil TypeSoil GroupPercentage of BasinCeB2, PcC2B5.5 ac100.0%ChAB/D0.0 ac0.0%VnB2C0.0 ac0.0%5.5 ac100.0%Hydrologic Soil Group UsedLand UseNo. AcresPercent of Drainage AreaCN for Group BGroup B Weighted CN CN for Group B/DGroup B/D Weighted CN CN for Group CGroup C Weighted CN Total Weighted CN Weighted CN %Wood (Good Cond.)3.3060.0%5555.0660.0700.0 55.0 33.0Open Space - Grass and Shurbs (Good Cond.)2.2040.0%6161.0710.0740.0 61.0 24.4Impervious0.000.0%9898.0980.0980.0 98.0 0.057.4Total5.5100%Composite Curve Number (CN):577Total Drain. Area (Ac.)26.00Site Soil TypeSoil GroupPercentage of BasinCeB2, PcC2B22.5 ac86.5%ChAB/D1.5 ac5.8%VnB2C2.0 ac7.7%26.0 ac100.0%Hydrologic Soil Group UsedLand UseNo. AcresPercent of Drainage AreaCN for Group BGroup B Weighted CN CN for Group B/DGroup B/D Weighted CN CN for Group CGroup C Weighted CN Total Weighted CN Weighted CN %Wood (Good Cond.)0.000.0%5547.6663.8705.4 56.8 0.0Open Space - Grass and Shurbs (Good Cond.)14.3055.0%6152.8714.1745.7 62.6 34.4Impervious11.1843.0%9884.8985.7987.5 98.0 42.176.6Total25.598%Composite Curve Number (CN):77Existing Condition Watershed BMP #Proposed Development Watershed BMP #T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-Runoff CNSheet: 1 of 1 3/17/2020 Project: Village at Granite -Phse 2DPR Job No.: 17031Location: Granite Quarry, NCDPR ASSOCIATES, INCRUN-OFF CURVE NUMBERPrepared by: RJChecked by: HNDate: 8-31-20188Total Drain. Area (Ac.)3.00Site Soil TypeSoil GroupPercentage of BasinCeB2, PcC2B0.0 ac0.0%ChAB/D0.0 ac0.0%VnB2C3.0 ac100.0%3.0 ac100.0%Hydrologic Soil Group UsedLand UseNo. AcresPercent of Drainage AreaCN for Group BGroup B Weighted CN CN for Group B/DGroup B/D Weighted CN CN for Group CGroup C Weighted CN Total Weighted CN Weighted CN %Wood (Good Cond.)3.00100.0%550.0660.07070.0 70.0 70.0Open Space - Grass and Shurbs (Good Cond.)0.000.0%610.0710.07474.0 74.0 0.0Impervious0.000.0%980.0980.09898.0 98.0 0.070.0Total3.0100%Composite Curve Number (CN):708Total Drain. Area (Ac.)6.50Site Soil TypeSoil GroupPercentage of BasinCeB2, PcC2B2.2 ac33.8%ChAB/D0.4 ac6.2%VnB2C4.1 ac63.1%6.7 ac103.1%Hydrologic Soil Group UsedLand UseNo. AcresPercent of Drainage AreaCN for Group BGroup B Weighted CN CN for Group B/DGroup B/D Weighted CN CN for Group CGroup C Weighted CN Total Weighted CN Weighted CN %Wood (Good Cond.)0.000.0%5518.6664.17044.2 66.8 0.0Open Space - Grass and Shurbs (Good Cond.)4.1664.0%6120.6714.47446.7 71.7 45.9Impervious2.3436.0%9833.2986.09861.8 101.0 36.482.2Total6.5100%Composite Curve Number (CN):82Existing Condition Watershed BMP #Proposed Development Watershed BMP #T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-Runoff CNSheet: 1 of 1 3/17/2020 Project: Village at Granite -Phse 2DPR Job No.: 17031Location: Granite Quarry, NCDPR ASSOCIATES, INCRUN-OFF CURVE NUMBERPrepared by: RJChecked by: HNDate: 8-31-2018Undetained AreaTotal Drain. Area (Ac.)8.50Site Soil TypeSoil GroupPercentage of BasinCeB2, PcC2B4.0 ac47.1%ChAB/D2.8 ac32.9%VnB2C1.7 ac20.0%8.5 ac100.0%Hydrologic Soil Group UsedLand UseNo. AcresPercent of Drainage AreaCN for Group BGroup B Weighted CN CN for Group B/DGroup B/D Weighted CN CN for Group CGroup C Weighted CN Total Weighted CN Weighted CN %Wood (Good Cond.)8.50100.0%5525.96621.77014.0 61.6 61.6Open Space - Grass and Shurbs (Good Cond.)0.000.0%6128.77123.47414.8 66.9 0.0Impervious0.000.0%9846.19832.39819.6 98.0 0.061.6Total8.5100%Composite Curve Number (CN):62Undetained AreaTotal Drain. Area (Ac.)4.50Site Soil TypeSoil GroupPercentage of BasinCeB2, PcC2B1.1 ac24.4%ChAB/D2.0 ac44.4%VnB2C1.4 ac31.1%4.5 ac100.0%Hydrologic Soil Group UsedLand UseNo. AcresPercent of Drainage AreaCN for Group BGroup B Weighted CN CN for Group B/DGroup B/D Weighted CN CN for Group CGroup C Weighted CN Total Weighted CN Weighted CN %Wood (Good Cond.)0.000.0%5513.46629.37021.8 64.6 0.0Open Space - Grass and Shurbs (Good Cond.)4.1091.1%6114.97131.67423.0 69.5 63.3Impervious0.408.9%9824.09843.69830.5 98.0 8.772.0Total4.5100%Composite Curve Number (CN):72Existing Condition Watershed Proposed Development WatershedT:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-Runoff CN.xlsSheet: 3 of 3 8/29/2018 IV. BMP DESIGN AND CALCULATIONS Project: Village at Granite - Phase2 Job No.: 17031 Location: Granite Quarry, NC Sheet: 1 of 3 DPR ASSOCIATES Prepared By: RJ Checked By: HN Date: 8-31-2018 DESIGN CRITERIA PER NCDENR STORMWATER DESIGN MANUAL DATED APRIL 2017 * BMP WET DETENTION POND 7 * Total Drainage Area (A):26.00 ac * Total Impervious Area "I" USED = 11.18 ac (See attached Impervious Calcs) * Total Water Quality Volume To Treat (First 1" of Rainfall): WQv = (P/12) (A) (Rv) (43,560) =41,244 cf (Simple Method, Schueler) P: Water Quality Design Storm, 1st 1-Inch of Rainfall 1 inch A: Drainage Area 26.00 ac. Rv: 0.05 + 0.009 (I) = 0.437 I: % of Impervious Area 43.0% * Main Pool: Pool Average Depth (H)=5.0 ft Surface Area to Drainage Area Ratio (SA/DA)= (NCDENR Table 1 )1.30 Required Surface Area (SA)=14,723 sf Provided Surface Area (SA) @ Perm. W.S. Elev.=16,600 sf Required Pool Volume (V= SA*H)=73,616 cf Provided Pool Volume (V) @ Perm. W.S. Elev.=93,100 cf * Forebay: Required Forebay Volume (15% of Pool Volume)=11,042 cf Provided Forbay Volume @ Perm. W.S. Elev.=16,500 cf * Estimated Storm Water Volume 1-yr, 24-hr Post-Dev:88,230 cf Qv = (P-0.2S)^2/ (P+0.8S) * A * (43,560/12) = (SCS Method) P: Design Storm, 1-yr 24-hr Storm Rainfall depth 2.80 inch A: Drainage Area 26.00 ac. S = 1000/CN-10 =2.99 inch CN: Curve Number 77 * Estimated Storm Water Volume 10-yr, 24-hr Post-Dev: Qv = (P-0.2S)^2/ (P+0.8S) * A * (43,560/12) =132,213 cf (SCS Method) P: Design Storm, 10-yr 24-hr Storm Rainfall depth 3.46 inch A: Drainage Area 26.00 ac. S = 1000/CN-10 =2.99 inch CN: Curve Number 77 BMP Pond Storage Volume Provided: Stage Surface Area Incremental Storage Total Storage (ft) (sf) (cf) (cf) Notes 713.5 7,600 0 0 Sediment Storage 714.0 8,200 3,950 3,950 Bottom of Pond 716.0 11,800 20,000 23,950 718.0 14,800 26,600 50,550 720.0 18,400 33,200 83,750 721.0 20,200 19,300 103,050 721.5 (Perm. W.S.) 22,700 10,725 113,775 Top of Perm. Pool 721.5 (Perm. W.S.) 22,700 0 0 Bottom of Temp. Pool 722.0 25,200 11,975 11,975 723.5 30,700 41,925 53,900 724.7 32,500 38,742 92,642 726.0 44,600 49,113 141,754 727.0 47,500 46,050 187,804 728.0 0 23,750 211,554 Top of Embankment Static Water Quality Elevation @ 723.61 ft Static Channel Protection Elevation @ 725.74 ft 43.0% (for Design) SHWTE and Groundwater @ 723.73' per Summit Geo Report letter dated 11-14-17 Tailwater Elevation (100 YEAR WSE) = 724.41' T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-BMP Wet Pond printed 3/7/2020 Project: Village at Granite - Phase2 Job No.: 17031 Location: Granite Quarry, NC Sheet: 3 of 3 DPR ASSOCIATES Prepared By: RJ Checked By: HN Date: 8-31-2018 * BMP POND 7 * Orifice Calculations For Dewatering Time Between 24 hrs to 120 hrs WQv 41,244 cf Average Surface Area 19,547 sf Area of Outlet Orifice (sf), a = (2)(A)h^(1/2))/(c)(t)(2g)^(1/2)) (NCDENR, Orifice Equation) a =0.082 where: A= Resevoir Area, sf 19,547 Min. Orifice Diameter (inch), d =3.89 h= Falling Head, ft 2.11 c= Discharge Coefficient 0.5 Orifice Diameter (inch) Used, d =3.0 t= Time (48 Hrs), sec. 172,800 g= Accelleration, ft/sq.sec 32.2 a= Orifice Area (sf) d= Orifice Diameter (inch) Emergency Drain Orifice Calculations For Permanent Pond Within 24 hrs Permanent Pool Volume 113,775 cf Average Surface Area 20,686 sf Area of Outlet Orifice (sf), a = (2)(A)h^(1/2))/(c)(t)(2g)^(1/2)) (NCDENR, Orifice Equation) a =0.280 where: A= Resevoir Area, sf 20,686 Min. Orifice Diameter (inch), d =7.18 h= Falling Head, ft 5.50 c= Discharge Coefficient 0.5 Orifice Diameter (inch) Used, d =5.5 t= Time (24 Hrs), sec. 86,400 g= Accelleration, ft/sq.sec 32.2 a= Orifice Area (sf) d= Orifice Diameter (inch) * BMP POND 7 Anti-Seep Collar Sizing Outlet Pipe Size (I.D.) = 36 in Outlet Pipe Size (O.D.) = 3.67 ft L, Length of Outlet Pipe = 50 lf Min. Flow Length = 57.5 ft Min. Flow Length = 115% of outlet pipe length Total Lengh of Collar offset = 7.5 ft Number of anti-seep collars 2 Offset per collar 3.8 ft Min. Outside dimension of each collar 7.42 ft Designed collars 2 at 7.5' x 7.5' T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-BMP Wet Pond printed 3/7/2020 Pond Report 17 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Saturday, 03 / 7 / 2020 Pond No. 1 - PH2 BMP 7 - WETPOND Pond Data Contours -User-defined contour areas. Average end area method used for volume calculation. Begining Elevation = 721.50 ft Stage / Storage Table Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft) 0.00 721.50 22,700 0 0 0.50 722.00 25,200 11,975 11,975 2.00 723.50 30,700 41,925 53,900 2.50 724.00 32,500 15,800 69,700 4.50 726.00 37,700 70,200 139,900 6.50 728.00 43,200 80,900 220,800 7.00 728.50 44,600 21,950 242,750 8.00 729.50 47,500 46,050 288,800 Culvert / Orifice Structures Weir Structures [A] [B] [C] [PrfRsr] [A] [B] [C] [D] Rise (in)= 36.00 3.00 6.00 0.00 Span (in)= 36.00 3.00 204.00 0.00 No. Barrels = 1 110 Invert El. (ft)= 719.13 721.50 726.80 0.00 Length (ft)= 50.00 0.50 0.50 0.00 Slope (%)= 0.25 0.00 0.00 n/a N-Value = .013 .013 .013 n/a Orifice Coeff.= 0.60 0.60 0.60 0.60 Multi-Stage = n/a Yes Yes No Crest Len (ft)= 10.00 0.00 0.00 0.00 Crest El. (ft)= 728.50 0.00 0.00 0.00 Weir Coeff.= 2.60 3.33 3.33 3.33 Weir Type = Broad --- --- --- Multi-Stage = No No No No Exfil.(in/hr)= 0.000 (by Contour) TW Elev. (ft)= 727.00 Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s). 0.00 7.00 14.00 21.00 28.00 35.00 42.00 49.00 56.00 63.00 70.00 Stage (ft) 0.00 721.50 2.00 723.50 4.00 725.50 6.00 727.50 8.00 729.50 Elev (ft) Discharge (cfs) Stage / Discharge Total Q Project: Village at Granite Quarry Job No.: 17031 Location: Granite Quarry, Rowan Co., NC DPR ASSOCIATES, INC Prepared By: RJ Checked By: HN =INPUT!C9 DESIGN CRITERIA PER NCDENR STORMWATER DESIGN MANUAL DATED NOV 2018 * BMP - SAND FILTER - WATER QUALITY CONTROL ONLY 8 * Total Drainage Area (A):6.50 ac * Total Impervious Area "I" USED = 2.34 ac (See attached Impervious Calcs) * Total Water Quality Volume To Treat (First 1" of Rainfall): WQv = (75%) (P/12) (A) (Rv) (43,560) =6,618 cf (Simple Method, Schueler) P: Water Quality Design Storm, 1st Inch of Rainfall 1 inch A: Drainage Area (Impervious Area Only) 6.50 ac. Rv: 0.05 + 0.009 (I) = 0.374 I: % of Impervious Area 36.0% * Total Storm Water Volume Control 1-yr, 24-hr Post-Dev: Qv = (P-0.2S)^2/ (P+0.8S) * A * (43560/12) =28,868 cf (SCS Method) P: Design Storm, 1-yr 24-hr Storm Rainfall depth 2.80 inch A: Drainage Area 6.50 ac. S = 1,000/CN-10 =2.20 inch CN: Curve Number 82 * Estimated Storm Water Volume 10-yr, 24-hr Post-Dev: Qv = (P-0.2S)^2/ (P+0.8S) * A * (43560/12) =41,283 cf (SCS Method) P: Design Storm, 10-yr 24-hr Storm Rainfall depth 3.46 inch A: Drainage Area 6.50 ac. S = 1000/CN-10 =2.20 inch CN: Curve Number 82 * Sedimentation Chamber Volume Min. Required: Vol-Pre = (0.2)(WQv) =1,324 cf * Sedimentation Chamber Volume Provided:1,935 cf * Filtration Media Surface Area Required: Af=[(WQv) (Df)]/ [(k) (Hf + Df) (Tf)] =523 sf (From Mecklenburg BMP Manual, Based on Darcy's Law) WQv: Water quality volume 6,618 cf Df: Filter bed depth (2'.5 for Optimal Efficiency)2.5 ft k: Permeability coefficient of filter media 3.50 ft/day (1.75" per hour, or 3.5' per day) Hf: Average height of water above filter bed, (half of pond depth, 1' max)1.75 ft Tf = Design filter bed drain time in days, (2 days beyond center 6-hr storm)2.125 days Depth of Pond Water (24" Max.)=24 inch * Filtration Media Surface Area Provided:1,000 sf BMP Storage Volume Provided: Elevation Surface Area Storage Total Storage (ft) (sf) (cf) (cf) 727.5 1,000 0 0 Bottom of Stone 728.5 1,000 1,000 1,000 Top of Stone/Bottom of San 731.0 1,000 2,500 3,500 Top of Sand Filter 731.0 1,000 00Bottom of Pond 732.0 6,900 3,950 3,950 733.0 8,400 7,650 11,600 734.0 9,900 9,150 20,750 735.0 11,400 10,650 31,400 736.0 13,000 12,200 43,600 737.0 14,700 13,850 57,450 Top of Pond Static Water Quality Elevation @ 732.75 ft Static Channel Protection Elevation @ 734.92 ft 36.0% (for Design) SHWTE and Groundwater @ 718.81 per Summit Geo Report dated 11-14-2017 Tailwater Elevation (100 YEAR WSE) = 727.68' T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-BMP Sandfilter printed 3/17/2020 page 1 of 3 Project: Village at Granite Quarry Job No.: 17031 Location: Granite Quarry, Rowan Co., NC DPR ASSOCIATES, INC Prepared By: RJ Checked By: HN =INPUT!C9 * BMP - SAND FILTER 8 * Water Draw Down Flow Rate Thru Sand Filter Media Qo = WQv / Tf = (Af)(k)(Hf+Df)/Df = 0.0382 cfs (Darcy's Law) k: Permeability coefficient of filter media 3.50 ft/day Af: Surface area, sf 523 sf Hf: Average height of water above filter bed 2.00 ft Df: Depth of soil filter bed 2.5 ft Q O @ Top of Media 731.0 = 0.0000 cfs Q O @ Median of WQv storage 731.9 = 0.0286 cfs Q O @ Top of WQv storage 732.8 = 0.0360 cfs * Time Drawdown from Inundation to Saturation surface Tf = WQv / Qo 48.17 hrs * Sizing Under Drain Pipes Q: Draw down rate thru sand filter 0.0382 cfs Use [1]-50 lf of 6" PVC or Sch 40, Use 1 of w/ 3/8" perforations spaced 3" on center, 4 rows w/ 90-deg apart 50 LF of 6 inch # of Perforation = (# pipes)(2 rows/ft) (Linear feet/per pipe -2') (2 holes/row) = (1 pipe)(2)(50 lf)(2)200 holes Capacity of one hole (3/8") = CA(2gh)^(0.5)(orifice equation)0.0078 cfs c= Discharge Coefficient 0.6 g= Accelleration, ft/sq.sec 32.2 a= Orifice Area (sf) of 3/8" hole 0.0008 h= head above perforation 4.5 Total Capacity = Capacity of 1 hole x # of holes 1.5660 cfs Total Capacity w/ 50% lost to clogging 0.7830 cfs Underdrain Pipe Capacity= 1.49/n(A)(A/P)^(2/3) (S)^0.5 (Manning Eq)0.395 cfs n= pipe coefficient 0.013 A= Area (sf) of 6" dia pipe 0.1963 P= Pipe Perimeter, ft 1.57 s= slope, 0.5% 0.005 Underdrain Pipe Capacity w/ 50% lost to clogging 0.1974 cfs Both Flow Rates thru Perforation and Pipe are greater than that of Flow rate of Sand Filter. OK * Orifice Calcs For Channel Protection Dewatering Time 2 days (48 hrs) Beyond Center of 24-hr Storm (Sized for the Volume of 1-yr Storm with 50% remained at 36th Hour, 5% remained at 60th Hour, and drained completely at 120th Hour). 1-yr Storm Volume, Less 50% Remain Beyond 36th Hour 14,434 cf Average Surface Area 3,682 sf Area of Outlet Orifice (sf), a = (2)(A)h^(1/2))/(c)(t)(2g)^(1/2)) (NCDENR, Orifice Equation) a = 0.023 where: A= Resevoir Area, sf 3,682 Max. Orifice Diameter (inch), d = 2.06 h= Falling Head, ft 3.84 c= Discharge Coefficient 0.6 Orifice Diameter (inch) Used, d =2.0 t= Time ( 36 hrs), sec.129,600 g= Accelleration, ft/sq.sec 32.2 a= Orifice Area (sf) d= Orifice Diameter (inch) * 1-yr Storm CPv Draw Down Flow Rate Thru Sand Media Qo = WQv / Tf 0.1336 cfs (Darcy's Law) CPv: 1-yr Storm Volume 28,868 cf Tf: 2 days beyond center of 24hr-storm, 60 hours 216,000 sec T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2-BMP Sandfilter printed 3/17/2020 page 3 of 3 Pond Report 19 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Saturday, 03 / 7 / 2020 Pond No. 2 - PH2 BMP 8 - SANDFILTER Pond Data Contours -User-defined contour areas. Average end area method used for volume calculation. Begining Elevation = 731.00 ft Stage / Storage Table Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft) 0.00 731.00 1,000 0 0 1.00 732.00 6,900 3,950 3,950 2.00 733.00 8,400 7,650 11,600 3.00 734.00 9,900 9,150 20,750 4.00 735.00 11,400 10,650 31,400 5.00 736.00 13,000 12,200 43,600 6.00 737.00 14,700 13,850 57,450 Culvert / Orifice Structures Weir Structures [A] [B] [C] [PrfRsr] [A] [B] [C] [D] Rise (in)= 18.00 3.00 6.00 0.00 Span (in)= 18.00 3.00 160.00 0.00 No. Barrels = 1 110 Invert El. (ft)= 723.48 732.75 735.30 0.00 Length (ft)= 56.00 0.50 0.50 0.00 Slope (%)= 1.00 0.00 0.00 n/a N-Value = .013 .013 .013 n/a Orifice Coeff.= 0.60 0.60 0.60 0.60 Multi-Stage = n/a Yes Yes No Crest Len (ft)= 10.00 0.00 0.00 0.00 Crest El. (ft)= 736.00 0.00 0.00 0.00 Weir Coeff.= 2.60 3.33 3.33 3.33 Weir Type = Broad --- --- --- Multi-Stage = No No No No Exfil.(in/hr)= 0.000 (by Contour) TW Elev. (ft)= 0.00 Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s). 0.00 6.00 12.00 18.00 24.00 30.00 36.00 42.00 48.00 54.00 60.00 Stage (ft) 0.00 731.00 1.00 732.00 2.00 733.00 3.00 734.00 4.00 735.00 5.00 736.00 6.00 737.00 Elev (ft) Discharge (cfs) Stage / Discharge Total Q Project: Village at Granite - Phase2 Job No.: 17031 Location: Granite Quarry, NC Sheet: 1 of 2 DPR ASSOCIATES Prepared By: RT Checked By: HN Date: 8-31-2018 Rev: 3-9-2020, RT OUTLET STRUCTURE BOUYANCY CALCULATION NCDOT #840.04 BMP Number BMP #7 BMP #8 Structure Number 7-502 8-301 WEIGHT OF DISPLACED WATER BY STRUCTURE Volume of riser: Outlet Pipe Diameter (in) =36 18 Length (ft) =5.50 5.00 Width (ft) =5.00 3.67 Wall thickness (ft) = 0.50 0.50 Weir Elev (ft) =726.80 735.30 Invert Out (in) =719.13 723.48 Height of Riser to Weir (ft) = 7.67 11.82 Riser Volume (cu.ft) =210.92 216.70 Volume of base: Length (ft) = 5.50 5.00 Width (ft) = 5.00 3.67 Hight (ft) = 0.67 0.67 Base Volume (cu.ft) = 18.43 12.23 Area Loss for outlet pipe opening (sf): 4.00 2.25 Volume Loss for outlet pipe opening (cu.ft): -12.57 -3.98 Total Volume of Structure: 216.78 224.96 Weight of Water (lbs/cu.ft) = 62.4 62.4 Weight of Water Displaced (lbs)13,527 14,037 WEIGHT OF STRUCTURE Volume of Base (cu ft) = 18.43 12.23 Volume of riser: Outside area (sf) = 27.50 18.33 Inside area (sf) = 18.00 10.67 Net area (sf) = 9.50 7.67 Height of Riser to Weir (ft) = 7.67 11.82 Volume of Riser (cu ft) = 72.86 90.62 Area Loss for outlet pipe opening (sf): 4.00 2.25 Volume Loss for outlet pipe opening (cu.ft): -12.57 -3.98 Net Volume of Riser (sf) = 60.30 86.64 Volume of Posts (cu.ft): Weir Height (in) = 6.00 6.00 Volume of Posts (cu.ft) = 0.90 0.89 Volume of Top Slab (cu.ft): Length (ft) = 5.50 5.00 Width (ft) = 5.00 3.67 Thickness (in) = 4.00 5.00 Volume of Top slab (cu.ft) = 9.17 7.65 Volume Loss for Opening for Frame/Cover (cu ft) = 1.22 1.53 Volume of Top slab (cu.ft) = 7.95 6.12 Weight of Concrete in Structure (lbs) = 13,135 15,883 Weight of Ring and Cover (lbs) = 230 231 Total Weight Structure (lbs) =13,365 16,114 T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2 BMP Anchor Block printed 3/7/2020 Project: Village at Granite - Phase2 Job No.: 17031 Location: Granite Quarry, NC Sheet: 2 of 2 DPR ASSOCIATES Prepared By: RT Checked By: HN Date: 8-31-2018 Rev: 3-9-2020, RT Anchor Block: Length (ft) = 6.50 6.00 Width (ft) = 6.00 4.67 Height (ft) =0.00 0.00 Anchor Block Volume (cu.ft) = 0.0 0.0 Weight of Water (lbs/cu.ft) = 62.4 62.4 Weight of Water Displaced by Anchor Block (lbs)00 Weight of Anchor Block (lbs)00 Not Required Not Required NET BOUYANCY*** Weight of Water Displaced (lbs) 13,527 14,037 Total Weight Structure (lbs) = 13,365 16,114 Bouyancy (lbs) = -162 2,076 Safety Factor = 0.99 1.15 *** Includes anchor block, if needed T:\PROJECTS\2017 PROJECTS\17031 The Village At Granite - LGI\PHASE 2\CALCS\BMP\Phase 2\17031-PH2 BMP Anchor Block printed 3/7/2020 V. BMP HYDROGRAGH ANALYSIS - Hydrograph Summary Report - Hydrograph Pond Report - Hydrograph Report Hydrograph Summary Report 1 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 0.301 2 746 3,755 ------ ------ ------ PH2 PRE - BMP 7 2 SCS Runoff 1.348 2 732 6,600 ------ ------ ------ PH2 PRE - BMP 8 3 SCS Runoff 0.970 2 738 5,437 ------ ------ ------ PH2 PRE - EC BASIN 9 4 SCS Runoff 0.148 2 760 2,595 ------ ------ ------ PH2 PRE - EC BASIN 10 5 SCS Runoff 0.269 2 752 4,462 ------ ------ ------ PH2 PRE - EC BASIN 11 6 SCS Runoff 0.486 2 744 4,745 ------ ------ ------ PH2 PRE - EC BASIN 12 7 SCS Runoff 3.369 2 718 9,304 ------ ------ ------ PH2 PRE - UNDET. 9 Combine 1.178 2 748 15,558 1, 4, 5, 6, ------ ------ PH2 PRE BMP 7 Total (+ EC 10, 11 10 Combine 2.283 2 734 12,037 2, 3, ------ ------ PH2 PRE BMP 8 Total (+ EC 9) 11 SCS Runoff 3.369 2 718 9,304 ------ ------ ------ PH2 PRE - UNDET. 12 Combine 4.416 2 720 36,898 9, 10, 11 ------ ------ PH2 PRE - TOTAL 14 SCS Runoff 41.31 2 718 82,715 ------ ------ ------ PH2 POST - BMP 7 15 SCS Runoff 13.48 2 718 27,063 ------ ------ ------ PH2 POST - BMP 8 16 SCS Runoff 5.168 2 718 10,594 ------ ------ ------ PH2 POST - UNDET. 17 Combine 59.95 2 718 120,373 14, 15, 16 ------ ------ PH2 POST - TOTAL 19 Reservoir 0.360 2 1442 75,481 14 723.94 67,888 PH2 ROUTED - BMP 7 20 Reservoir 0.226 2 1092 25,193 15 733.79 18,818 PH2 ROUTED - BMP 8 21 SCS Runoff 5.168 2 718 10,594 ------ ------ ------ PH2 POST - UNDET. 22 Combine 5.423 2 718 111,268 19, 20, 21 ------ ------ PH2 ROUTED - TOTAL 17031-PH2-BMP Hydraflow.gpw Return Period: 1 Year Thursday, 06 / 11 / 2020 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 1 PH2 PRE - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 0.301 cfs Storm frequency = 1 yrs Time to peak = 746 min Time interval = 2 min Hyd. volume = 3,755 cuft Drainage area = 5.500 ac Curve number = 57 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 30.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 2 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Q (cfs) Time (min) PH2 PRE - BMP 7 Hyd. No. 1 -- 1 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 2 PH2 PRE - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 1.348 cfs Storm frequency = 1 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 6,600 cuft Drainage area = 3.000 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 3 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 Q (cfs) Time (min) PH2 PRE - BMP 8 Hyd. No. 2 -- 1 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 3 PH2 PRE - EC BASIN 9 Hydrograph type = SCS Runoff Peak discharge = 0.970 cfs Storm frequency = 1 yrs Time to peak = 738 min Time interval = 2 min Hyd. volume = 5,437 cuft Drainage area = 2.500 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 34.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 4 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 9 Hyd. No. 3 -- 1 Year Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 4 PH2 PRE - EC BASIN 10 Hydrograph type = SCS Runoff Peak discharge = 0.148 cfs Storm frequency = 1 yrs Time to peak = 760 min Time interval = 2 min Hyd. volume = 2,595 cuft Drainage area = 5.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 36.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 5 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Q (cfs) Time (min) PH2 PRE - EC BASIN 10 Hyd. No. 4 -- 1 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 5 PH2 PRE - EC BASIN 11 Hydrograph type = SCS Runoff Peak discharge = 0.269 cfs Storm frequency = 1 yrs Time to peak = 752 min Time interval = 2 min Hyd. volume = 4,462 cuft Drainage area = 8.500 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 6 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Q (cfs) Time (min) PH2 PRE - EC BASIN 11 Hyd. No. 5 -- 1 Year Hyd No. 5 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 6 PH2 PRE - EC BASIN 12 Hydrograph type = SCS Runoff Peak discharge = 0.486 cfs Storm frequency = 1 yrs Time to peak = 744 min Time interval = 2 min Hyd. volume = 4,745 cuft Drainage area = 5.000 ac Curve number = 60 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 35.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 7 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 0.05 0.05 0.10 0.10 0.15 0.15 0.20 0.20 0.25 0.25 0.30 0.30 0.35 0.35 0.40 0.40 0.45 0.45 0.50 0.50 Q (cfs) Time (min) PH2 PRE - EC BASIN 12 Hyd. No. 6 -- 1 Year Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 7 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 3.369 cfs Storm frequency = 1 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 9,304 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 8 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 7 -- 1 Year Hyd No. 7 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 9 PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hydrograph type = Combine Peak discharge = 1.178 cfs Storm frequency = 1 yrs Time to peak = 748 min Time interval = 2 min Hyd. volume = 15,558 cuft Inflow hyds. = 1, 4, 5, 6 Contrib. drain. area = 24.000 ac 9 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 Q (cfs) Time (min) PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hyd. No. 9 -- 1 Year Hyd No. 9 Hyd No. 1 Hyd No. 4 Hyd No. 5 Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 10 PH2 PRE BMP 8 Total (+ EC 9) Hydrograph type = Combine Peak discharge = 2.283 cfs Storm frequency = 1 yrs Time to peak = 734 min Time interval = 2 min Hyd. volume = 12,037 cuft Inflow hyds. = 2, 3 Contrib. drain. area = 5.500 ac 10 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 Q (cfs) Time (min) PH2 PRE BMP 8 Total (+ EC 9) Hyd. No. 10 -- 1 Year Hyd No. 10 Hyd No. 2 Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 11 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 3.369 cfs Storm frequency = 1 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 9,304 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 11 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 11 -- 1 Year Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 12 PH2 PRE - TOTAL Hydrograph type = Combine Peak discharge = 4.416 cfs Storm frequency = 1 yrs Time to peak = 720 min Time interval = 2 min Hyd. volume = 36,898 cuft Inflow hyds. = 9, 10, 11 Contrib. drain. area = 8.500 ac 12 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 Q (cfs) Time (min) PH2 PRE - TOTAL Hyd. No. 12 -- 1 Year Hyd No. 12 Hyd No. 9 Hyd No. 10 Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 14 PH2 POST - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 41.31 cfs Storm frequency = 1 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 82,715 cuft Drainage area = 26.000 ac Curve number = 77 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 13 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 POST - BMP 7 Hyd. No. 14 -- 1 Year Hyd No. 14 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 15 PH2 POST - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 13.48 cfs Storm frequency = 1 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 27,063 cuft Drainage area = 6.500 ac Curve number = 82 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 14 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 12.00 12.00 14.00 14.00 Q (cfs) Time (min) PH2 POST - BMP 8 Hyd. No. 15 -- 1 Year Hyd No. 15 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 16 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 5.168 cfs Storm frequency = 1 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 10,594 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 15 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 16 -- 1 Year Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 17 PH2 POST - TOTAL Hydrograph type = Combine Peak discharge = 59.95 cfs Storm frequency = 1 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 120,373 cuft Inflow hyds. = 14, 15, 16 Contrib. drain. area = 37.000 ac 16 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 Q (cfs) Time (min) PH2 POST - TOTAL Hyd. No. 17 -- 1 Year Hyd No. 17 Hyd No. 14 Hyd No. 15 Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 19 PH2 ROUTED - BMP 7 Hydrograph type = Reservoir Peak discharge = 0.360 cfs Storm frequency = 1 yrs Time to peak = 1442 min Time interval = 2 min Hyd. volume = 75,481 cuft Inflow hyd. No. = 14 - PH2 POST - BMP 7 Max. Elevation = 723.94 ft Reservoir name = PH2 BMP 7 - WETPOND Max. Storage = 67,888 cuft Storage Indication method used. 17 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 ROUTED - BMP 7 Hyd. No. 19 -- 1 Year Hyd No. 19 Hyd No. 14 Total storage used = 67,888 cuft Pond Report 18 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Pond No. 1 - PH2 BMP 7 - WETPOND Pond Data Contours -User-defined contour areas. Average end area method used for volume calculation. Begining Elevation = 721.50 ft Stage / Storage Table Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft) 0.00 721.50 22,600 0 0 0.50 722.00 25,300 11,975 11,975 2.00 723.50 30,600 41,925 53,900 2.50 724.00 32,500 15,775 69,675 4.50 726.00 37,700 70,200 139,875 6.50 728.00 43,200 80,900 220,775 7.00 728.50 44,600 21,950 242,725 8.00 729.50 47,500 46,050 288,775 Culvert / Orifice Structures Weir Structures [A] [B] [C] [PrfRsr] [A] [B] [C] [D] Rise (in)= 36.00 3.00 6.00 0.00 Span (in)= 36.00 3.00 204.00 0.00 No. Barrels = 1 110 Invert El. (ft)= 719.13 721.50 726.80 0.00 Length (ft)= 50.00 0.50 0.50 0.00 Slope (%)= 0.25 0.00 0.00 n/a N-Value = .013 .013 .013 n/a Orifice Coeff.= 0.60 0.60 0.60 0.60 Multi-Stage = n/a Yes Yes No Crest Len (ft)= 10.00 0.00 0.00 0.00 Crest El. (ft)= 728.50 0.00 0.00 0.00 Weir Coeff.= 2.60 3.33 3.33 3.33 Weir Type = Broad --- --- --- Multi-Stage = No No No No Exfil.(in/hr)= 0.000 (by Contour) TW Elev. (ft)= 0.00 Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s). 0.00 9.00 18.00 27.00 36.00 45.00 54.00 63.00 72.00 81.00 90.00 99.00 Stage (ft) 0.00 721.50 2.00 723.50 4.00 725.50 6.00 727.50 8.00 729.50 Elev (ft) Discharge (cfs) Stage / Discharge Total Q Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 20 PH2 ROUTED - BMP 8 Hydrograph type = Reservoir Peak discharge = 0.226 cfs Storm frequency = 1 yrs Time to peak = 1092 min Time interval = 2 min Hyd. volume = 25,193 cuft Inflow hyd. No. = 15 - PH2 POST - BMP 8 Max. Elevation = 733.79 ft Reservoir name = PH2 BMP 8 - SANDFILTER Max. Storage = 18,818 cuft Storage Indication method used. 19 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 12.00 12.00 14.00 14.00 Q (cfs) Time (min) PH2 ROUTED - BMP 8 Hyd. No. 20 -- 1 Year Hyd No. 20 Hyd No. 15 Total storage used = 18,818 cuft Pond Report 20 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Pond No. 2 - PH2 BMP 8 - SANDFILTER Pond Data Contours -User-defined contour areas. Average end area method used for volume calculation. Begining Elevation = 731.00 ft Stage / Storage Table Stage (ft) Elevation (ft) Contour area (sqft) Incr. Storage (cuft) Total storage (cuft) 0.00 731.00 1,000 0 0 1.00 732.00 6,900 3,950 3,950 2.00 733.00 8,400 7,650 11,600 3.00 734.00 9,900 9,150 20,750 4.00 735.00 11,400 10,650 31,400 5.00 736.00 13,000 12,200 43,600 6.00 737.00 14,700 13,850 57,450 Culvert / Orifice Structures Weir Structures [A] [B] [C] [PrfRsr] [A] [B] [C] [D] Rise (in)= 18.00 3.00 6.00 0.00 Span (in)= 18.00 3.00 160.00 0.00 No. Barrels = 1 110 Invert El. (ft)= 723.48 732.75 735.30 0.00 Length (ft)= 56.00 0.50 0.50 0.00 Slope (%)= 1.00 0.00 0.00 n/a N-Value = .013 .013 .013 n/a Orifice Coeff.= 0.60 0.60 0.60 0.60 Multi-Stage = n/a Yes Yes No Crest Len (ft)= 10.00 0.00 0.00 0.00 Crest El. (ft)= 736.00 0.00 0.00 0.00 Weir Coeff.= 2.60 3.33 3.33 3.33 Weir Type = Broad --- --- --- Multi-Stage = No No No No Exfil.(in/hr)= 0.000 (by Contour) TW Elev. (ft)= 0.00 Note: Culvert/Orifice outflows are analyzed under inlet (ic) and outlet (oc) control. Weir risers checked for orifice conditions (ic) and submergence (s). 0.00 6.00 12.00 18.00 24.00 30.00 36.00 42.00 48.00 54.00 60.00 Stage (ft) 0.00 731.00 1.00 732.00 2.00 733.00 3.00 734.00 4.00 735.00 5.00 736.00 6.00 737.00 Elev (ft) Discharge (cfs) Stage / Discharge Total Q Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 21 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 5.168 cfs Storm frequency = 1 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 10,594 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 2.80 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 21 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 21 -- 1 Year Hyd No. 21 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 22 PH2 ROUTED - TOTAL Hydrograph type = Combine Peak discharge = 5.423 cfs Storm frequency = 1 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 111,268 cuft Inflow hyds. = 19, 20, 21 Contrib. drain. area = 4.500 ac 22 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 Q (cfs) Time (min) PH2 ROUTED - TOTAL Hyd. No. 22 -- 1 Year Hyd No. 22 Hyd No. 19 Hyd No. 20 Hyd No. 21 Hydrograph Summary Report 23 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 0.980 2 736 7,418 ------ ------ ------ PH2 PRE - BMP 7 2 SCS Runoff 2.288 2 732 10,180 ------ ------ ------ PH2 PRE - BMP 8 3 SCS Runoff 1.649 2 736 8,387 ------ ------ ------ PH2 PRE - EC BASIN 9 4 SCS Runoff 0.541 2 744 5,491 ------ ------ ------ PH2 PRE - EC BASIN 10 5 SCS Runoff 1.038 2 738 9,441 ------ ------ ------ PH2 PRE - EC BASIN 11 6 SCS Runoff 1.220 2 738 8,625 ------ ------ ------ PH2 PRE - EC BASIN 12 7 SCS Runoff 7.202 2 718 16,202 ------ ------ ------ PH2 PRE - UNDET. 9 Combine 3.750 2 738 30,975 1, 4, 5, 6, ------ ------ PH2 PRE BMP 7 Total (+ EC 10, 11 10 Combine 3.875 2 734 18,567 2, 3, ------ ------ PH2 PRE BMP 8 Total (+ EC 9) 11 SCS Runoff 7.202 2 718 16,202 ------ ------ ------ PH2 PRE - UNDET. 12 Combine 9.464 2 718 65,744 9, 10, 11 ------ ------ PH2 PRE - TOTAL 14 SCS Runoff 59.33 2 718 118,742 ------ ------ ------ PH2 POST - BMP 7 15 SCS Runoff 18.44 2 716 37,251 ------ ------ ------ PH2 POST - BMP 8 16 SCS Runoff 7.953 2 718 15,976 ------ ------ ------ PH2 POST - UNDET. 17 Combine 85.66 2 718 171,969 14, 15, 16 ------ ------ PH2 POST - TOTAL 19 Reservoir 0.427 2 1442 99,236 14 724.89 100,943 PH2 ROUTED - BMP 7 20 Reservoir 0.301 2 1078 34,764 15 734.50 26,101 PH2 ROUTED - BMP 8 21 SCS Runoff 7.953 2 718 15,976 ------ ------ ------ PH2 POST - UNDET. 22 Combine 8.352 2 718 149,975 19, 20, 21 ------ ------ PH2 ROUTED - TOTAL 17031-PH2-BMP Hydraflow.gpw Return Period: 2 Year Thursday, 06 / 11 / 2020 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 1 PH2 PRE - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 0.980 cfs Storm frequency = 2 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 7,418 cuft Drainage area = 5.500 ac Curve number = 57 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 30.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 24 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Q (cfs) Time (min) PH2 PRE - BMP 7 Hyd. No. 1 -- 2 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 2 PH2 PRE - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 2.288 cfs Storm frequency = 2 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 10,180 cuft Drainage area = 3.000 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 25 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 Q (cfs) Time (min) PH2 PRE - BMP 8 Hyd. No. 2 -- 2 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 3 PH2 PRE - EC BASIN 9 Hydrograph type = SCS Runoff Peak discharge = 1.649 cfs Storm frequency = 2 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 8,387 cuft Drainage area = 2.500 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 34.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 26 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 9 Hyd. No. 3 -- 2 Year Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 4 PH2 PRE - EC BASIN 10 Hydrograph type = SCS Runoff Peak discharge = 0.541 cfs Storm frequency = 2 yrs Time to peak = 744 min Time interval = 2 min Hyd. volume = 5,491 cuft Drainage area = 5.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 36.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 27 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 0.10 0.10 0.20 0.20 0.30 0.30 0.40 0.40 0.50 0.50 0.60 0.60 0.70 0.70 0.80 0.80 0.90 0.90 1.00 1.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 10 Hyd. No. 4 -- 2 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 5 PH2 PRE - EC BASIN 11 Hydrograph type = SCS Runoff Peak discharge = 1.038 cfs Storm frequency = 2 yrs Time to peak = 738 min Time interval = 2 min Hyd. volume = 9,441 cuft Drainage area = 8.500 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 28 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 11 Hyd. No. 5 -- 2 Year Hyd No. 5 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 6 PH2 PRE - EC BASIN 12 Hydrograph type = SCS Runoff Peak discharge = 1.220 cfs Storm frequency = 2 yrs Time to peak = 738 min Time interval = 2 min Hyd. volume = 8,625 cuft Drainage area = 5.000 ac Curve number = 60 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 35.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 29 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 12 Hyd. No. 6 -- 2 Year Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 7 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 7.202 cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 16,202 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 30 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 7 -- 2 Year Hyd No. 7 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 9 PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hydrograph type = Combine Peak discharge = 3.750 cfs Storm frequency = 2 yrs Time to peak = 738 min Time interval = 2 min Hyd. volume = 30,975 cuft Inflow hyds. = 1, 4, 5, 6 Contrib. drain. area = 24.000 ac 31 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 Q (cfs) Time (min) PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hyd. No. 9 -- 2 Year Hyd No. 9 Hyd No. 1 Hyd No. 4 Hyd No. 5 Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 10 PH2 PRE BMP 8 Total (+ EC 9) Hydrograph type = Combine Peak discharge = 3.875 cfs Storm frequency = 2 yrs Time to peak = 734 min Time interval = 2 min Hyd. volume = 18,567 cuft Inflow hyds. = 2, 3 Contrib. drain. area = 5.500 ac 32 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 Q (cfs) Time (min) PH2 PRE BMP 8 Total (+ EC 9) Hyd. No. 10 -- 2 Year Hyd No. 10 Hyd No. 2 Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 11 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 7.202 cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 16,202 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 33 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 11 -- 2 Year Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 12 PH2 PRE - TOTAL Hydrograph type = Combine Peak discharge = 9.464 cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 65,744 cuft Inflow hyds. = 9, 10, 11 Contrib. drain. area = 8.500 ac 34 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 Q (cfs) Time (min) PH2 PRE - TOTAL Hyd. No. 12 -- 2 Year Hyd No. 12 Hyd No. 9 Hyd No. 10 Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 14 PH2 POST - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 59.33 cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 118,742 cuft Drainage area = 26.000 ac Curve number = 77 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 35 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 Q (cfs) Time (min) PH2 POST - BMP 7 Hyd. No. 14 -- 2 Year Hyd No. 14 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 15 PH2 POST - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 18.44 cfs Storm frequency = 2 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 37,251 cuft Drainage area = 6.500 ac Curve number = 82 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 36 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 21.00 21.00 Q (cfs) Time (min) PH2 POST - BMP 8 Hyd. No. 15 -- 2 Year Hyd No. 15 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 16 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 7.953 cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 15,976 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 37 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 16 -- 2 Year Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 17 PH2 POST - TOTAL Hydrograph type = Combine Peak discharge = 85.66 cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 171,969 cuft Inflow hyds. = 14, 15, 16 Contrib. drain. area = 37.000 ac 38 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 70.00 70.00 80.00 80.00 90.00 90.00 Q (cfs) Time (min) PH2 POST - TOTAL Hyd. No. 17 -- 2 Year Hyd No. 17 Hyd No. 14 Hyd No. 15 Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 19 PH2 ROUTED - BMP 7 Hydrograph type = Reservoir Peak discharge = 0.427 cfs Storm frequency = 2 yrs Time to peak = 1442 min Time interval = 2 min Hyd. volume = 99,236 cuft Inflow hyd. No. = 14 - PH2 POST - BMP 7 Max. Elevation = 724.89 ft Reservoir name = PH2 BMP 7 - WETPOND Max. Storage = 100,943 cuft Storage Indication method used. 39 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 Q (cfs) Time (min) PH2 ROUTED - BMP 7 Hyd. No. 19 -- 2 Year Hyd No. 19 Hyd No. 14 Total storage used = 100,943 cuft Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 20 PH2 ROUTED - BMP 8 Hydrograph type = Reservoir Peak discharge = 0.301 cfs Storm frequency = 2 yrs Time to peak = 1078 min Time interval = 2 min Hyd. volume = 34,764 cuft Inflow hyd. No. = 15 - PH2 POST - BMP 8 Max. Elevation = 734.50 ft Reservoir name = PH2 BMP 8 - SANDFILTER Max. Storage = 26,101 cuft Storage Indication method used. 40 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 21.00 21.00 Q (cfs) Time (min) PH2 ROUTED - BMP 8 Hyd. No. 20 -- 2 Year Hyd No. 20 Hyd No. 15 Total storage used = 26,101 cuft Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 21 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 7.953 cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 15,976 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 3.38 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 41 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 21 -- 2 Year Hyd No. 21 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 22 PH2 ROUTED - TOTAL Hydrograph type = Combine Peak discharge = 8.352 cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 149,975 cuft Inflow hyds. = 19, 20, 21 Contrib. drain. area = 4.500 ac 42 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 Q (cfs) Time (min) PH2 ROUTED - TOTAL Hyd. No. 22 -- 2 Year Hyd No. 22 Hyd No. 19 Hyd No. 20 Hyd No. 21 Hydrograph Summary Report 43 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 4.327 2 732 21,207 ------ ------ ------ PH2 PRE - BMP 7 2 SCS Runoff 5.239 2 732 21,532 ------ ------ ------ PH2 PRE - BMP 8 3 SCS Runoff 3.799 2 736 17,739 ------ ------ ------ PH2 PRE - EC BASIN 9 4 SCS Runoff 2.840 2 738 16,874 ------ ------ ------ PH2 PRE - EC BASIN 10 5 SCS Runoff 5.584 2 734 29,015 ------ ------ ------ PH2 PRE - EC BASIN 11 6 SCS Runoff 4.301 2 736 22,513 ------ ------ ------ PH2 PRE - EC BASIN 12 7 SCS Runoff 19.89 2 718 40,187 ------ ------ ------ PH2 PRE - UNDET. 9 Combine 16.82 2 734 89,609 1, 4, 5, 6, ------ ------ PH2 PRE BMP 7 Total (+ EC 10, 11 10 Combine 8.898 2 732 39,271 2, 3, ------ ------ PH2 PRE BMP 8 Total (+ EC 9) 11 SCS Runoff 19.89 2 718 40,187 ------ ------ ------ PH2 PRE - UNDET. 12 Combine 29.98 2 718 169,066 9, 10, 11 ------ ------ PH2 PRE - TOTAL 14 SCS Runoff 111.87 2 716 226,176 ------ ------ ------ PH2 POST - BMP 7 15 SCS Runoff 32.53 2 716 66,529 ------ ------ ------ PH2 POST - BMP 8 16 SCS Runoff 16.30 2 718 32,718 ------ ------ ------ PH2 POST - UNDET. 17 Combine 160.59 2 716 325,423 14, 15, 16 ------ ------ PH2 POST - TOTAL 19 Reservoir 2.046 2 1012 167,571 14 726.86 174,586 PH2 ROUTED - BMP 7 20 Reservoir 3.184 2 744 63,092 15 735.45 36,918 PH2 ROUTED - BMP 8 21 SCS Runoff 16.30 2 718 32,718 ------ ------ ------ PH2 POST - UNDET. 22 Combine 17.00 2 718 263,381 19, 20, 21 ------ ------ PH2 ROUTED - TOTAL 17031-PH2-BMP Hydraflow.gpw Return Period: 10 Year Thursday, 06 / 11 / 2020 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 1 PH2 PRE - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 4.327 cfs Storm frequency = 10 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 21,207 cuft Drainage area = 5.500 ac Curve number = 57 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 30.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 44 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 Q (cfs) Time (min) PH2 PRE - BMP 7 Hyd. No. 1 -- 10 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 2 PH2 PRE - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 5.239 cfs Storm frequency = 10 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 21,532 cuft Drainage area = 3.000 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 45 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 Q (cfs) Time (min) PH2 PRE - BMP 8 Hyd. No. 2 -- 10 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 3 PH2 PRE - EC BASIN 9 Hydrograph type = SCS Runoff Peak discharge = 3.799 cfs Storm frequency = 10 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 17,739 cuft Drainage area = 2.500 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 34.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 46 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 9 Hyd. No. 3 -- 10 Year Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 4 PH2 PRE - EC BASIN 10 Hydrograph type = SCS Runoff Peak discharge = 2.840 cfs Storm frequency = 10 yrs Time to peak = 738 min Time interval = 2 min Hyd. volume = 16,874 cuft Drainage area = 5.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 36.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 47 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 10 Hyd. No. 4 -- 10 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 5 PH2 PRE - EC BASIN 11 Hydrograph type = SCS Runoff Peak discharge = 5.584 cfs Storm frequency = 10 yrs Time to peak = 734 min Time interval = 2 min Hyd. volume = 29,015 cuft Drainage area = 8.500 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 48 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 11 Hyd. No. 5 -- 10 Year Hyd No. 5 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 6 PH2 PRE - EC BASIN 12 Hydrograph type = SCS Runoff Peak discharge = 4.301 cfs Storm frequency = 10 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 22,513 cuft Drainage area = 5.000 ac Curve number = 60 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 35.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 49 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 12 Hyd. No. 6 -- 10 Year Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 7 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 19.89 cfs Storm frequency = 10 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 40,187 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 50 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 21.00 21.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 7 -- 10 Year Hyd No. 7 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 9 PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hydrograph type = Combine Peak discharge = 16.82 cfs Storm frequency = 10 yrs Time to peak = 734 min Time interval = 2 min Hyd. volume = 89,609 cuft Inflow hyds. = 1, 4, 5, 6 Contrib. drain. area = 24.000 ac 51 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 Q (cfs) Time (min) PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hyd. No. 9 -- 10 Year Hyd No. 9 Hyd No. 1 Hyd No. 4 Hyd No. 5 Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 10 PH2 PRE BMP 8 Total (+ EC 9) Hydrograph type = Combine Peak discharge = 8.898 cfs Storm frequency = 10 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 39,271 cuft Inflow hyds. = 2, 3 Contrib. drain. area = 5.500 ac 52 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 Q (cfs) Time (min) PH2 PRE BMP 8 Total (+ EC 9) Hyd. No. 10 -- 10 Year Hyd No. 10 Hyd No. 2 Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 11 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 19.89 cfs Storm frequency = 10 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 40,187 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 53 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 21.00 21.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 11 -- 10 Year Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 12 PH2 PRE - TOTAL Hydrograph type = Combine Peak discharge = 29.98 cfs Storm frequency = 10 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 169,066 cuft Inflow hyds. = 9, 10, 11 Contrib. drain. area = 8.500 ac 54 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 5.00 5.00 10.00 10.00 15.00 15.00 20.00 20.00 25.00 25.00 30.00 30.00 Q (cfs) Time (min) PH2 PRE - TOTAL Hyd. No. 12 -- 10 Year Hyd No. 12 Hyd No. 9 Hyd No. 10 Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 14 PH2 POST - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 111.87 cfs Storm frequency = 10 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 226,176 cuft Drainage area = 26.000 ac Curve number = 77 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 55 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 Q (cfs) Time (min) PH2 POST - BMP 7 Hyd. No. 14 -- 10 Year Hyd No. 14 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 15 PH2 POST - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 32.53 cfs Storm frequency = 10 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 66,529 cuft Drainage area = 6.500 ac Curve number = 82 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 56 0 120 240 360 480 600 720 840 960 1080 1200 1320 Q (cfs) 0.00 0.00 5.00 5.00 10.00 10.00 15.00 15.00 20.00 20.00 25.00 25.00 30.00 30.00 35.00 35.00 Q (cfs) Time (min) PH2 POST - BMP 8 Hyd. No. 15 -- 10 Year Hyd No. 15 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 16 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 16.30 cfs Storm frequency = 10 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 32,718 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 57 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 16 -- 10 Year Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 17 PH2 POST - TOTAL Hydrograph type = Combine Peak discharge = 160.59 cfs Storm frequency = 10 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 325,423 cuft Inflow hyds. = 14, 15, 16 Contrib. drain. area = 37.000 ac 58 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 160.00 160.00 180.00 180.00 Q (cfs) Time (min) PH2 POST - TOTAL Hyd. No. 17 -- 10 Year Hyd No. 17 Hyd No. 14 Hyd No. 15 Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 19 PH2 ROUTED - BMP 7 Hydrograph type = Reservoir Peak discharge = 2.046 cfs Storm frequency = 10 yrs Time to peak = 1012 min Time interval = 2 min Hyd. volume = 167,571 cuft Inflow hyd. No. = 14 - PH2 POST - BMP 7 Max. Elevation = 726.86 ft Reservoir name = PH2 BMP 7 - WETPOND Max. Storage = 174,586 cuft Storage Indication method used. 59 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 Q (cfs) Time (min) PH2 ROUTED - BMP 7 Hyd. No. 19 -- 10 Year Hyd No. 19 Hyd No. 14 Total storage used = 174,586 cuft Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 20 PH2 ROUTED - BMP 8 Hydrograph type = Reservoir Peak discharge = 3.184 cfs Storm frequency = 10 yrs Time to peak = 744 min Time interval = 2 min Hyd. volume = 63,092 cuft Inflow hyd. No. = 15 - PH2 POST - BMP 8 Max. Elevation = 735.45 ft Reservoir name = PH2 BMP 8 - SANDFILTER Max. Storage = 36,918 cuft Storage Indication method used. 60 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 5.00 5.00 10.00 10.00 15.00 15.00 20.00 20.00 25.00 25.00 30.00 30.00 35.00 35.00 Q (cfs) Time (min) PH2 ROUTED - BMP 8 Hyd. No. 20 -- 10 Year Hyd No. 20 Hyd No. 15 Total storage used = 36,918 cuft Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 21 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 16.30 cfs Storm frequency = 10 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 32,718 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 4.92 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 61 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 21 -- 10 Year Hyd No. 21 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 22 PH2 ROUTED - TOTAL Hydrograph type = Combine Peak discharge = 17.00 cfs Storm frequency = 10 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 263,381 cuft Inflow hyds. = 19, 20, 21 Contrib. drain. area = 4.500 ac 62 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 Q (cfs) Time (min) PH2 ROUTED - TOTAL Hyd. No. 22 -- 10 Year Hyd No. 22 Hyd No. 19 Hyd No. 20 Hyd No. 21 Hydrograph Summary Report 63 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 7.008 2 732 31,420 ------ ------ ------ PH2 PRE - BMP 7 2 SCS Runoff 7.178 2 732 29,087 ------ ------ ------ PH2 PRE - BMP 8 3 SCS Runoff 5.214 2 736 23,964 ------ ------ ------ PH2 PRE - EC BASIN 9 4 SCS Runoff 4.786 2 736 25,499 ------ ------ ------ PH2 PRE - EC BASIN 10 5 SCS Runoff 9.428 2 732 43,847 ------ ------ ------ PH2 PRE - EC BASIN 11 6 SCS Runoff 6.613 2 736 32,501 ------ ------ ------ PH2 PRE - EC BASIN 12 7 SCS Runoff 28.54 2 718 57,131 ------ ------ ------ PH2 PRE - UNDET. 9 Combine 27.46 2 734 133,268 1, 4, 5, 6, ------ ------ PH2 PRE BMP 7 Total (+ EC 10, 11 10 Combine 12.24 2 732 53,050 2, 3, ------ ------ PH2 PRE BMP 8 Total (+ EC 9) 11 SCS Runoff 28.54 2 718 57,131 ------ ------ ------ PH2 PRE - UNDET. 12 Combine 45.98 2 718 243,450 9, 10, 11 ------ ------ PH2 PRE - TOTAL 14 SCS Runoff 145.04 2 716 294,737 ------ ------ ------ PH2 POST - BMP 7 15 SCS Runoff 41.04 2 716 84,744 ------ ------ ------ PH2 POST - BMP 8 16 SCS Runoff 21.65 2 716 43,718 ------ ------ ------ PH2 POST - UNDET. 17 Combine 207.73 2 716 423,199 14, 15, 16 ------ ------ PH2 POST - TOTAL 19 Reservoir 7.212 2 782 236,021 14 727.03 181,596 PH2 ROUTED - BMP 7 20 Reservoir 15.96 2 722 81,242 15 735.81 41,030 PH2 ROUTED - BMP 8 21 SCS Runoff 21.65 2 716 43,718 ------ ------ ------ PH2 POST - UNDET. 22 Combine 28.31 2 720 360,982 19, 20, 21 ------ ------ PH2 ROUTED - TOTAL 17031-PH2-BMP Hydraflow.gpw Return Period: 25 Year Thursday, 06 / 11 / 2020 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 1 PH2 PRE - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 7.008 cfs Storm frequency = 25 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 31,420 cuft Drainage area = 5.500 ac Curve number = 57 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 30.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 64 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 Q (cfs) Time (min) PH2 PRE - BMP 7 Hyd. No. 1 -- 25 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 2 PH2 PRE - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 7.178 cfs Storm frequency = 25 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 29,087 cuft Drainage area = 3.000 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 65 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 Q (cfs) Time (min) PH2 PRE - BMP 8 Hyd. No. 2 -- 25 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 3 PH2 PRE - EC BASIN 9 Hydrograph type = SCS Runoff Peak discharge = 5.214 cfs Storm frequency = 25 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 23,964 cuft Drainage area = 2.500 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 34.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 66 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 9 Hyd. No. 3 -- 25 Year Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 4 PH2 PRE - EC BASIN 10 Hydrograph type = SCS Runoff Peak discharge = 4.786 cfs Storm frequency = 25 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 25,499 cuft Drainage area = 5.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 36.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 67 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 10 Hyd. No. 4 -- 25 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 5 PH2 PRE - EC BASIN 11 Hydrograph type = SCS Runoff Peak discharge = 9.428 cfs Storm frequency = 25 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 43,847 cuft Drainage area = 8.500 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 68 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 11 Hyd. No. 5 -- 25 Year Hyd No. 5 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 6 PH2 PRE - EC BASIN 12 Hydrograph type = SCS Runoff Peak discharge = 6.613 cfs Storm frequency = 25 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 32,501 cuft Drainage area = 5.000 ac Curve number = 60 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 35.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 69 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 7.00 7.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 12 Hyd. No. 6 -- 25 Year Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 7 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 28.54 cfs Storm frequency = 25 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 57,131 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 70 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 5.00 5.00 10.00 10.00 15.00 15.00 20.00 20.00 25.00 25.00 30.00 30.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 7 -- 25 Year Hyd No. 7 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 9 PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hydrograph type = Combine Peak discharge = 27.46 cfs Storm frequency = 25 yrs Time to peak = 734 min Time interval = 2 min Hyd. volume = 133,268 cuft Inflow hyds. = 1, 4, 5, 6 Contrib. drain. area = 24.000 ac 71 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 4.00 4.00 8.00 8.00 12.00 12.00 16.00 16.00 20.00 20.00 24.00 24.00 28.00 28.00 Q (cfs) Time (min) PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hyd. No. 9 -- 25 Year Hyd No. 9 Hyd No. 1 Hyd No. 4 Hyd No. 5 Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 10 PH2 PRE BMP 8 Total (+ EC 9) Hydrograph type = Combine Peak discharge = 12.24 cfs Storm frequency = 25 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 53,050 cuft Inflow hyds. = 2, 3 Contrib. drain. area = 5.500 ac 72 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 12.00 12.00 14.00 14.00 Q (cfs) Time (min) PH2 PRE BMP 8 Total (+ EC 9) Hyd. No. 10 -- 25 Year Hyd No. 10 Hyd No. 2 Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 11 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 28.54 cfs Storm frequency = 25 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 57,131 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 73 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 5.00 5.00 10.00 10.00 15.00 15.00 20.00 20.00 25.00 25.00 30.00 30.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 11 -- 25 Year Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 12 PH2 PRE - TOTAL Hydrograph type = Combine Peak discharge = 45.98 cfs Storm frequency = 25 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 243,450 cuft Inflow hyds. = 9, 10, 11 Contrib. drain. area = 8.500 ac 74 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 PRE - TOTAL Hyd. No. 12 -- 25 Year Hyd No. 12 Hyd No. 9 Hyd No. 10 Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 14 PH2 POST - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 145.04 cfs Storm frequency = 25 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 294,737 cuft Drainage area = 26.000 ac Curve number = 77 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 75 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 160.00 160.00 Q (cfs) Time (min) PH2 POST - BMP 7 Hyd. No. 14 -- 25 Year Hyd No. 14 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 15 PH2 POST - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 41.04 cfs Storm frequency = 25 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 84,744 cuft Drainage area = 6.500 ac Curve number = 82 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 76 0 120 240 360 480 600 720 840 960 1080 1200 1320 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 POST - BMP 8 Hyd. No. 15 -- 25 Year Hyd No. 15 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 16 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 21.65 cfs Storm frequency = 25 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 43,718 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 77 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 4.00 4.00 8.00 8.00 12.00 12.00 16.00 16.00 20.00 20.00 24.00 24.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 16 -- 25 Year Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 17 PH2 POST - TOTAL Hydrograph type = Combine Peak discharge = 207.73 cfs Storm frequency = 25 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 423,199 cuft Inflow hyds. = 14, 15, 16 Contrib. drain. area = 37.000 ac 78 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Q (cfs) 0.00 0.00 30.00 30.00 60.00 60.00 90.00 90.00 120.00 120.00 150.00 150.00 180.00 180.00 210.00 210.00 Q (cfs) Time (min) PH2 POST - TOTAL Hyd. No. 17 -- 25 Year Hyd No. 17 Hyd No. 14 Hyd No. 15 Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 19 PH2 ROUTED - BMP 7 Hydrograph type = Reservoir Peak discharge = 7.212 cfs Storm frequency = 25 yrs Time to peak = 782 min Time interval = 2 min Hyd. volume = 236,021 cuft Inflow hyd. No. = 14 - PH2 POST - BMP 7 Max. Elevation = 727.03 ft Reservoir name = PH2 BMP 7 - WETPOND Max. Storage = 181,596 cuft Storage Indication method used. 79 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 160.00 160.00 Q (cfs) Time (min) PH2 ROUTED - BMP 7 Hyd. No. 19 -- 25 Year Hyd No. 19 Hyd No. 14 Total storage used = 181,596 cuft Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 20 PH2 ROUTED - BMP 8 Hydrograph type = Reservoir Peak discharge = 15.96 cfs Storm frequency = 25 yrs Time to peak = 722 min Time interval = 2 min Hyd. volume = 81,242 cuft Inflow hyd. No. = 15 - PH2 POST - BMP 8 Max. Elevation = 735.81 ft Reservoir name = PH2 BMP 8 - SANDFILTER Max. Storage = 41,030 cuft Storage Indication method used. 80 0 240 480 720 960 1200 1440 1680 1920 2160 2400 2640 2880 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 ROUTED - BMP 8 Hyd. No. 20 -- 25 Year Hyd No. 20 Hyd No. 15 Total storage used = 41,030 cuft Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 21 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 21.65 cfs Storm frequency = 25 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 43,718 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 5.83 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 81 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 4.00 4.00 8.00 8.00 12.00 12.00 16.00 16.00 20.00 20.00 24.00 24.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 21 -- 25 Year Hyd No. 21 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 22 PH2 ROUTED - TOTAL Hydrograph type = Combine Peak discharge = 28.31 cfs Storm frequency = 25 yrs Time to peak = 720 min Time interval = 2 min Hyd. volume = 360,982 cuft Inflow hyds. = 19, 20, 21 Contrib. drain. area = 4.500 ac 82 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 5.00 5.00 10.00 10.00 15.00 15.00 20.00 20.00 25.00 25.00 30.00 30.00 Q (cfs) Time (min) PH2 ROUTED - TOTAL Hyd. No. 22 -- 25 Year Hyd No. 22 Hyd No. 19 Hyd No. 20 Hyd No. 21 Hydrograph Summary Report 83 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 9.371 2 732 40,445 ------ ------ ------ PH2 PRE - BMP 7 2 SCS Runoff 8.806 2 730 35,458 ------ ------ ------ PH2 PRE - BMP 8 3 SCS Runoff 6.397 2 736 29,212 ------ ------ ------ PH2 PRE - EC BASIN 9 4 SCS Runoff 6.568 2 736 33,192 ------ ------ ------ PH2 PRE - EC BASIN 10 5 SCS Runoff 12.90 2 732 57,075 ------ ------ ------ PH2 PRE - EC BASIN 11 6 SCS Runoff 8.619 2 736 41,215 ------ ------ ------ PH2 PRE - EC BASIN 12 7 SCS Runoff 35.90 2 718 71,801 ------ ------ ------ PH2 PRE - UNDET. 9 Combine 36.91 2 734 171,927 1, 4, 5, 6, ------ ------ PH2 PRE BMP 7 Total (+ EC 10, 11 10 Combine 15.03 2 732 64,670 2, 3, ------ ------ PH2 PRE BMP 8 Total (+ EC 9) 11 SCS Runoff 35.90 2 718 71,801 ------ ------ ------ PH2 PRE - UNDET. 12 Combine 60.21 2 718 308,397 9, 10, 11 ------ ------ PH2 PRE - TOTAL 14 SCS Runoff 172.06 2 716 351,494 ------ ------ ------ PH2 POST - BMP 7 15 SCS Runoff 47.89 2 716 99,658 ------ ------ ------ PH2 POST - BMP 8 16 SCS Runoff 26.17 2 716 52,942 ------ ------ ------ PH2 POST - UNDET. 17 Combine 246.12 2 716 504,095 14, 15, 16 ------ ------ PH2 POST - TOTAL 19 Reservoir 17.48 2 742 292,704 14 727.25 190,357 PH2 ROUTED - BMP 7 20 Reservoir 25.15 2 722 96,152 15 736.11 45,025 PH2 ROUTED - BMP 8 21 SCS Runoff 26.17 2 716 52,942 ------ ------ ------ PH2 POST - UNDET. 22 Combine 44.94 2 720 441,798 19, 20, 21 ------ ------ PH2 ROUTED - TOTAL 17031-PH2-BMP Hydraflow.gpw Return Period: 50 Year Thursday, 06 / 11 / 2020 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 1 PH2 PRE - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 9.371 cfs Storm frequency = 50 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 40,445 cuft Drainage area = 5.500 ac Curve number = 57 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 30.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 84 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 Q (cfs) Time (min) PH2 PRE - BMP 7 Hyd. No. 1 -- 50 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 2 PH2 PRE - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 8.806 cfs Storm frequency = 50 yrs Time to peak = 730 min Time interval = 2 min Hyd. volume = 35,458 cuft Drainage area = 3.000 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 85 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 Q (cfs) Time (min) PH2 PRE - BMP 8 Hyd. No. 2 -- 50 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 3 PH2 PRE - EC BASIN 9 Hydrograph type = SCS Runoff Peak discharge = 6.397 cfs Storm frequency = 50 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 29,212 cuft Drainage area = 2.500 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 34.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 86 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 7.00 7.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 9 Hyd. No. 3 -- 50 Year Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 4 PH2 PRE - EC BASIN 10 Hydrograph type = SCS Runoff Peak discharge = 6.568 cfs Storm frequency = 50 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 33,192 cuft Drainage area = 5.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 36.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 87 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 1.00 1.00 2.00 2.00 3.00 3.00 4.00 4.00 5.00 5.00 6.00 6.00 7.00 7.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 10 Hyd. No. 4 -- 50 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 5 PH2 PRE - EC BASIN 11 Hydrograph type = SCS Runoff Peak discharge = 12.90 cfs Storm frequency = 50 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 57,075 cuft Drainage area = 8.500 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 88 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 12.00 12.00 14.00 14.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 11 Hyd. No. 5 -- 50 Year Hyd No. 5 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 6 PH2 PRE - EC BASIN 12 Hydrograph type = SCS Runoff Peak discharge = 8.619 cfs Storm frequency = 50 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 41,215 cuft Drainage area = 5.000 ac Curve number = 60 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 35.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 89 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 12 Hyd. No. 6 -- 50 Year Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 7 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 35.90 cfs Storm frequency = 50 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 71,801 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 90 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 7 -- 50 Year Hyd No. 7 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 9 PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hydrograph type = Combine Peak discharge = 36.91 cfs Storm frequency = 50 yrs Time to peak = 734 min Time interval = 2 min Hyd. volume = 171,927 cuft Inflow hyds. = 1, 4, 5, 6 Contrib. drain. area = 24.000 ac 91 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 Q (cfs) Time (min) PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hyd. No. 9 -- 50 Year Hyd No. 9 Hyd No. 1 Hyd No. 4 Hyd No. 5 Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 10 PH2 PRE BMP 8 Total (+ EC 9) Hydrograph type = Combine Peak discharge = 15.03 cfs Storm frequency = 50 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 64,670 cuft Inflow hyds. = 2, 3 Contrib. drain. area = 5.500 ac 92 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 Q (cfs) Time (min) PH2 PRE BMP 8 Total (+ EC 9) Hyd. No. 10 -- 50 Year Hyd No. 10 Hyd No. 2 Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 11 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 35.90 cfs Storm frequency = 50 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 71,801 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 93 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 11 -- 50 Year Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 12 PH2 PRE - TOTAL Hydrograph type = Combine Peak discharge = 60.21 cfs Storm frequency = 50 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 308,397 cuft Inflow hyds. = 9, 10, 11 Contrib. drain. area = 8.500 ac 94 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 70.00 70.00 Q (cfs) Time (min) PH2 PRE - TOTAL Hyd. No. 12 -- 50 Year Hyd No. 12 Hyd No. 9 Hyd No. 10 Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 14 PH2 POST - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 172.06 cfs Storm frequency = 50 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 351,494 cuft Drainage area = 26.000 ac Curve number = 77 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 95 0 120 240 360 480 600 720 840 960 1080 1200 1320 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 160.00 160.00 180.00 180.00 Q (cfs) Time (min) PH2 POST - BMP 7 Hyd. No. 14 -- 50 Year Hyd No. 14 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 15 PH2 POST - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 47.89 cfs Storm frequency = 50 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 99,658 cuft Drainage area = 6.500 ac Curve number = 82 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 96 0 120 240 360 480 600 720 840 960 1080 1200 1320 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 POST - BMP 8 Hyd. No. 15 -- 50 Year Hyd No. 15 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 16 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 26.17 cfs Storm frequency = 50 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 52,942 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 97 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Q (cfs) 0.00 0.00 4.00 4.00 8.00 8.00 12.00 12.00 16.00 16.00 20.00 20.00 24.00 24.00 28.00 28.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 16 -- 50 Year Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 17 PH2 POST - TOTAL Hydrograph type = Combine Peak discharge = 246.12 cfs Storm frequency = 50 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 504,095 cuft Inflow hyds. = 14, 15, 16 Contrib. drain. area = 37.000 ac 98 0 120 240 360 480 600 720 840 960 1080 1200 1320 Q (cfs) 0.00 0.00 40.00 40.00 80.00 80.00 120.00 120.00 160.00 160.00 200.00 200.00 240.00 240.00 280.00 280.00 Q (cfs) Time (min) PH2 POST - TOTAL Hyd. No. 17 -- 50 Year Hyd No. 17 Hyd No. 14 Hyd No. 15 Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 19 PH2 ROUTED - BMP 7 Hydrograph type = Reservoir Peak discharge = 17.48 cfs Storm frequency = 50 yrs Time to peak = 742 min Time interval = 2 min Hyd. volume = 292,704 cuft Inflow hyd. No. = 14 - PH2 POST - BMP 7 Max. Elevation = 727.25 ft Reservoir name = PH2 BMP 7 - WETPOND Max. Storage = 190,357 cuft Storage Indication method used. 99 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 20.00 20.00 40.00 40.00 60.00 60.00 80.00 80.00 100.00 100.00 120.00 120.00 140.00 140.00 160.00 160.00 180.00 180.00 Q (cfs) Time (min) PH2 ROUTED - BMP 7 Hyd. No. 19 -- 50 Year Hyd No. 19 Hyd No. 14 Total storage used = 190,357 cuft Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 20 PH2 ROUTED - BMP 8 Hydrograph type = Reservoir Peak discharge = 25.15 cfs Storm frequency = 50 yrs Time to peak = 722 min Time interval = 2 min Hyd. volume = 96,152 cuft Inflow hyd. No. = 15 - PH2 POST - BMP 8 Max. Elevation = 736.11 ft Reservoir name = PH2 BMP 8 - SANDFILTER Max. Storage = 45,025 cuft Storage Indication method used. 100 0 240 480 720 960 1200 1440 1680 1920 2160 2400 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 ROUTED - BMP 8 Hyd. No. 20 -- 50 Year Hyd No. 20 Hyd No. 15 Total storage used = 45,025 cuft Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 21 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 26.17 cfs Storm frequency = 50 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 52,942 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 6.56 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 101 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Q (cfs) 0.00 0.00 4.00 4.00 8.00 8.00 12.00 12.00 16.00 16.00 20.00 20.00 24.00 24.00 28.00 28.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 21 -- 50 Year Hyd No. 21 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 22 PH2 ROUTED - TOTAL Hydrograph type = Combine Peak discharge = 44.94 cfs Storm frequency = 50 yrs Time to peak = 720 min Time interval = 2 min Hyd. volume = 441,798 cuft Inflow hyds. = 19, 20, 21 Contrib. drain. area = 4.500 ac 102 0 480 960 1440 1920 2400 2880 3360 3840 4320 4800 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 ROUTED - TOTAL Hyd. No. 22 -- 50 Year Hyd No. 22 Hyd No. 19 Hyd No. 20 Hyd No. 21 Hydrograph Summary Report 103 Hyd. Hydrograph Peak Time Time to Hyd. Inflow Maximum Total Hydrograph No. type flow interval Peak volume hyd(s) elevation strge used Description (origin) (cfs) (min) (min) (cuft) (ft) (cuft) 1 SCS Runoff 11.95 2 732 50,349 ------ ------ ------ PH2 PRE - BMP 7 2 SCS Runoff 10.53 2 730 42,227 ------ ------ ------ PH2 PRE - BMP 8 3 SCS Runoff 7.649 2 734 34,789 ------ ------ ------ PH2 PRE - EC BASIN 9 4 SCS Runoff 8.531 2 736 41,688 ------ ------ ------ PH2 PRE - EC BASIN 10 5 SCS Runoff 16.72 2 732 71,685 ------ ------ ------ PH2 PRE - EC BASIN 11 6 SCS Runoff 10.79 2 736 50,696 ------ ------ ------ PH2 PRE - EC BASIN 12 7 SCS Runoff 43.75 2 718 87,674 ------ ------ ------ PH2 PRE - UNDET. 9 Combine 47.25 2 734 214,417 1, 4, 5, 6, ------ ------ PH2 PRE BMP 7 Total (+ EC 10, 11 10 Combine 17.98 2 732 77,015 2, 3, ------ ------ PH2 PRE BMP 8 Total (+ EC 9) 11 SCS Runoff 43.75 2 718 87,674 ------ ------ ------ PH2 PRE - UNDET. 12 Combine 75.70 2 718 379,107 9, 10, 11 ------ ------ PH2 PRE - TOTAL 14 SCS Runoff 200.04 2 716 411,034 ------ ------ ------ PH2 POST - BMP 7 15 SCS Runoff 54.93 2 716 115,188 ------ ------ ------ PH2 POST - BMP 8 16 SCS Runoff 30.90 2 716 62,704 ------ ------ ------ PH2 POST - UNDET. 17 Combine 285.87 2 716 588,927 14, 15, 16 ------ ------ PH2 POST - TOTAL 19 Reservoir 34.43 2 726 352,178 14 727.74 210,230 PH2 ROUTED - BMP 7 20 Reservoir 33.81 2 722 111,678 15 736.38 48,450 PH2 ROUTED - BMP 8 21 SCS Runoff 30.90 2 716 62,704 ------ ------ ------ PH2 POST - UNDET. 22 Combine 79.52 2 722 526,560 19, 20, 21 ------ ------ PH2 ROUTED - TOTAL 17031-PH2-BMP Hydraflow.gpw Return Period: 100 Year Thursday, 06 / 11 / 2020 Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 1 PH2 PRE - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 11.95 cfs Storm frequency = 100 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 50,349 cuft Drainage area = 5.500 ac Curve number = 57 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 30.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 104 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 12.00 12.00 Q (cfs) Time (min) PH2 PRE - BMP 7 Hyd. No. 1 -- 100 Year Hyd No. 1 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 2 PH2 PRE - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 10.53 cfs Storm frequency = 100 yrs Time to peak = 730 min Time interval = 2 min Hyd. volume = 42,227 cuft Drainage area = 3.000 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 105 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 12.00 12.00 Q (cfs) Time (min) PH2 PRE - BMP 8 Hyd. No. 2 -- 100 Year Hyd No. 2 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 3 PH2 PRE - EC BASIN 9 Hydrograph type = SCS Runoff Peak discharge = 7.649 cfs Storm frequency = 100 yrs Time to peak = 734 min Time interval = 2 min Hyd. volume = 34,789 cuft Drainage area = 2.500 ac Curve number = 70 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 34.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 106 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 9 Hyd. No. 3 -- 100 Year Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 4 PH2 PRE - EC BASIN 10 Hydrograph type = SCS Runoff Peak discharge = 8.531 cfs Storm frequency = 100 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 41,688 cuft Drainage area = 5.000 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 36.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 107 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 10 Hyd. No. 4 -- 100 Year Hyd No. 4 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 5 PH2 PRE - EC BASIN 11 Hydrograph type = SCS Runoff Peak discharge = 16.72 cfs Storm frequency = 100 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 71,685 cuft Drainage area = 8.500 ac Curve number = 55 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 29.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 108 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 11 Hyd. No. 5 -- 100 Year Hyd No. 5 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 6 PH2 PRE - EC BASIN 12 Hydrograph type = SCS Runoff Peak discharge = 10.79 cfs Storm frequency = 100 yrs Time to peak = 736 min Time interval = 2 min Hyd. volume = 50,696 cuft Drainage area = 5.000 ac Curve number = 60 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 35.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 109 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 2.00 2.00 4.00 4.00 6.00 6.00 8.00 8.00 10.00 10.00 12.00 12.00 Q (cfs) Time (min) PH2 PRE - EC BASIN 12 Hyd. No. 6 -- 100 Year Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 7 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 43.75 cfs Storm frequency = 100 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 87,674 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 110 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 7 -- 100 Year Hyd No. 7 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 9 PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hydrograph type = Combine Peak discharge = 47.25 cfs Storm frequency = 100 yrs Time to peak = 734 min Time interval = 2 min Hyd. volume = 214,417 cuft Inflow hyds. = 1, 4, 5, 6 Contrib. drain. area = 24.000 ac 111 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 PRE BMP 7 Total (+ EC 10, 11 & 12) Hyd. No. 9 -- 100 Year Hyd No. 9 Hyd No. 1 Hyd No. 4 Hyd No. 5 Hyd No. 6 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 10 PH2 PRE BMP 8 Total (+ EC 9) Hydrograph type = Combine Peak discharge = 17.98 cfs Storm frequency = 100 yrs Time to peak = 732 min Time interval = 2 min Hyd. volume = 77,015 cuft Inflow hyds. = 2, 3 Contrib. drain. area = 5.500 ac 112 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 3.00 3.00 6.00 6.00 9.00 9.00 12.00 12.00 15.00 15.00 18.00 18.00 Q (cfs) Time (min) PH2 PRE BMP 8 Total (+ EC 9) Hyd. No. 10 -- 100 Year Hyd No. 10 Hyd No. 2 Hyd No. 3 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 11 PH2 PRE - UNDET. Hydrograph type = SCS Runoff Peak discharge = 43.75 cfs Storm frequency = 100 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 87,674 cuft Drainage area = 8.500 ac Curve number = 62 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 113 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 Q (cfs) Time (min) PH2 PRE - UNDET. Hyd. No. 11 -- 100 Year Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 12 PH2 PRE - TOTAL Hydrograph type = Combine Peak discharge = 75.70 cfs Storm frequency = 100 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 379,107 cuft Inflow hyds. = 9, 10, 11 Contrib. drain. area = 8.500 ac 114 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 70.00 70.00 80.00 80.00 Q (cfs) Time (min) PH2 PRE - TOTAL Hyd. No. 12 -- 100 Year Hyd No. 12 Hyd No. 9 Hyd No. 10 Hyd No. 11 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 14 PH2 POST - BMP 7 Hydrograph type = SCS Runoff Peak discharge = 200.04 cfs Storm frequency = 100 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 411,034 cuft Drainage area = 26.000 ac Curve number = 77 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 115 0 120 240 360 480 600 720 840 960 1080 1200 1320 Q (cfs) 0.00 0.00 30.00 30.00 60.00 60.00 90.00 90.00 120.00 120.00 150.00 150.00 180.00 180.00 210.00 210.00 Q (cfs) Time (min) PH2 POST - BMP 7 Hyd. No. 14 -- 100 Year Hyd No. 14 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 15 PH2 POST - BMP 8 Hydrograph type = SCS Runoff Peak discharge = 54.93 cfs Storm frequency = 100 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 115,188 cuft Drainage area = 6.500 ac Curve number = 82 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 116 0 120 240 360 480 600 720 840 960 1080 1200 1320 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 Q (cfs) Time (min) PH2 POST - BMP 8 Hyd. No. 15 -- 100 Year Hyd No. 15 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 16 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 30.90 cfs Storm frequency = 100 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 62,704 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 117 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Q (cfs) 0.00 0.00 5.00 5.00 10.00 10.00 15.00 15.00 20.00 20.00 25.00 25.00 30.00 30.00 35.00 35.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 16 -- 100 Year Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 17 PH2 POST - TOTAL Hydrograph type = Combine Peak discharge = 285.87 cfs Storm frequency = 100 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 588,927 cuft Inflow hyds. = 14, 15, 16 Contrib. drain. area = 37.000 ac 118 0 120 240 360 480 600 720 840 960 1080 1200 1320 Q (cfs) 0.00 0.00 40.00 40.00 80.00 80.00 120.00 120.00 160.00 160.00 200.00 200.00 240.00 240.00 280.00 280.00 320.00 320.00 Q (cfs) Time (min) PH2 POST - TOTAL Hyd. No. 17 -- 100 Year Hyd No. 17 Hyd No. 14 Hyd No. 15 Hyd No. 16 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 19 PH2 ROUTED - BMP 7 Hydrograph type = Reservoir Peak discharge = 34.43 cfs Storm frequency = 100 yrs Time to peak = 726 min Time interval = 2 min Hyd. volume = 352,178 cuft Inflow hyd. No. = 14 - PH2 POST - BMP 7 Max. Elevation = 727.74 ft Reservoir name = PH2 BMP 7 - WETPOND Max. Storage = 210,230 cuft Storage Indication method used. 119 0 600 1200 1800 2400 3000 3600 4200 4800 5400 6000 Q (cfs) 0.00 0.00 30.00 30.00 60.00 60.00 90.00 90.00 120.00 120.00 150.00 150.00 180.00 180.00 210.00 210.00 Q (cfs) Time (min) PH2 ROUTED - BMP 7 Hyd. No. 19 -- 100 Year Hyd No. 19 Hyd No. 14 Total storage used = 210,230 cuft Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 20 PH2 ROUTED - BMP 8 Hydrograph type = Reservoir Peak discharge = 33.81 cfs Storm frequency = 100 yrs Time to peak = 722 min Time interval = 2 min Hyd. volume = 111,678 cuft Inflow hyd. No. = 15 - PH2 POST - BMP 8 Max. Elevation = 736.38 ft Reservoir name = PH2 BMP 8 - SANDFILTER Max. Storage = 48,450 cuft Storage Indication method used. 120 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 1680 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 Q (cfs) Time (min) PH2 ROUTED - BMP 8 Hyd. No. 20 -- 100 Year Hyd No. 20 Hyd No. 15 Total storage used = 48,450 cuft Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 21 PH2 POST - UNDET. Hydrograph type = SCS Runoff Peak discharge = 30.90 cfs Storm frequency = 100 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 62,704 cuft Drainage area = 4.500 ac Curve number = 72 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 7.31 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 121 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Q (cfs) 0.00 0.00 5.00 5.00 10.00 10.00 15.00 15.00 20.00 20.00 25.00 25.00 30.00 30.00 35.00 35.00 Q (cfs) Time (min) PH2 POST - UNDET. Hyd. No. 21 -- 100 Year Hyd No. 21 Hydrograph Report Hydraflow Hydrographs Extension for Autodesk® Civil 3D® 2019 by Autodesk, Inc. v2020 Thursday, 06 / 11 / 2020 Hyd. No. 22 PH2 ROUTED - TOTAL Hydrograph type = Combine Peak discharge = 79.52 cfs Storm frequency = 100 yrs Time to peak = 722 min Time interval = 2 min Hyd. volume = 526,560 cuft Inflow hyds. = 19, 20, 21 Contrib. drain. area = 4.500 ac 122 0 240 480 720 960 1200 1440 1680 1920 2160 Q (cfs) 0.00 0.00 10.00 10.00 20.00 20.00 30.00 30.00 40.00 40.00 50.00 50.00 60.00 60.00 70.00 70.00 80.00 80.00 Q (cfs) Time (min) PH2 ROUTED - TOTAL Hyd. No. 22 -- 100 Year Hyd No. 22 Hyd No. 19 Hyd No. 20 Hyd No. 21 VI. APPENDIX 9/20/2017 Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.5603&lon=-80.4590&data=depth&units=english&series=pds 1/4 NOAA Atlas 14, V olume 2, Version 3 Location name: Salisbury , North Carolina, USA * Latitude: 35.5603°, Longitude: -80.459° Elevation: 805.12 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley NOAA, National Weather Service, Silver Spring, Maryland PF_tabular | PF_graphical | Maps_&_aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches ) 1 Duration Average recurrence interval (years) 1 2 5 10 25 50 100 200 500 1000 5-min 0.391 (0.360‑0.424) 0.462 (0.426‑0.503) 0.539 (0.496‑0.586) 0.592 (0.543‑0.642) 0.652 (0.595‑0.706) 0.691 (0.628‑0.749) 0.726 (0.657‑0.787) 0.756 (0.680‑0.820) 0.788 (0.702‑0.856) 0.809 (0.715‑0.880) 10-min 0.624 (0.576‑0.678) 0.739 (0.682‑0.805) 0.863 (0.794‑0.938) 0.947 (0.869‑1.03) 1.04 (0.948‑1.12) 1.10 (1.00‑1.19) 1.15 (1.04‑1.25) 1.20 (1.08‑1.30) 1.25 (1.11‑1.35) 1.27 (1.13‑1.39) 15-min 0.780 (0.720‑0.847) 0.930 (0.857‑1.01) 1.09 (1.00‑1.19) 1.20 (1.10‑1.30) 1.32 (1.20‑1.43) 1.39 (1.27‑1.51) 1.46 (1.32‑1.58) 1.51 (1.36‑1.64) 1.57 (1.40‑1.71) 1.60 (1.41‑1.74) 30-min 1.07 (0.986‑1.16) 1.28 (1.18‑1.40) 1.55 (1.43‑1.69) 1.74 (1.59‑1.88) 1.95 (1.78‑2.11) 2.10 (1.91‑2.27) 2.24 (2.02‑2.42) 2.35 (2.12‑2.55) 2.50 (2.23‑2.71) 2.59 (2.29‑2.82) 60-min 1.33 (1.23‑1.45) 1.61 (1.49‑1.75) 1.99 (1.83‑2.16) 2.26 (2.07‑2.45) 2.60 (2.37‑2.81) 2.85 (2.59‑3.08) 3.08 (2.78‑3.33) 3.30 (2.97‑3.58) 3.58 (3.19‑3.89) 3.78 (3.34‑4.11) 2-hr 1.54 (1.42‑1.68) 1.87 (1.71‑2.04) 2.32 (2.13‑2.53) 2.66 (2.43‑2.90) 3.09 (2.81‑3.37) 3.42 (3.09‑3.72) 3.74 (3.36‑4.07) 4.04 (3.60‑4.41) 4.44 (3.91‑4.85) 4.73 (4.13‑5.17) 3-hr 1.65 (1.51‑1.80) 1.99 (1.83‑2.17) 2.48 (2.27‑2.71) 2.85 (2.61‑3.10) 3.35 (3.04‑3.64) 3.73 (3.37‑4.05) 4.11 (3.68‑4.45) 4.48 (3.99‑4.87) 4.99 (4.38‑5.42) 5.37 (4.67‑5.85) 6-hr 1.99 (1.83‑2.18) 2.40 (2.21‑2.63) 3.00 (2.75‑3.28) 3.46 (3.16‑3.77) 4.08 (3.70‑4.43) 4.56 (4.12‑4.95) 5.05 (4.52‑5.48) 5.55 (4.91‑6.02) 6.21 (5.43‑6.75) 6.73 (5.81‑7.31) 12-hr 2.36 (2.17‑2.57) 2.84 (2.62‑3.11) 3.56 (3.27‑3.89) 4.13 (3.78‑4.51) 4.91 (4.46‑5.33) 5.53 (4.98‑5.99) 6.17 (5.51‑6.67) 6.82 (6.03‑7.37) 7.73 (6.71‑8.33) 8.44 (7.22‑9.10) 24-hr 2.80 (2.61‑3.01) 3.38 (3.15‑3.64) 4.24 (3.95‑4.56) 4.92 (4.57‑5.29) 5.83 (5.41‑6.27) 6.56 (6.07‑7.05) 7.31 (6.74‑7.85) 8.07 (7.42‑8.67) 9.11 (8.34‑9.81) 9.93 (9.06‑10.7) 2-day 3.26 (3.04‑3.50) 3.93 (3.67‑4.22) 4.89 (4.56‑5.25) 5.65 (5.26‑6.05) 6.67 (6.19‑7.13) 7.47 (6.92‑8.00) 8.29 (7.66‑8.88) 9.13 (8.41‑9.79) 10.3 (9.42‑11.0) 11.2 (10.2‑12.0) 3-day 3.47 (3.24‑3.71) 4.17 (3.90‑4.47) 5.17 (4.82‑5.53) 5.95 (5.54‑6.36) 7.01 (6.51‑7.50) 7.85 (7.28‑8.40) 8.71 (8.05‑9.32) 9.59 (8.83‑10.3) 10.8 (9.90‑11.6) 11.7 (10.7‑12.6) 4-day 3.68 (3.44‑3.93) 4.41 (4.13‑4.71) 5.44 (5.08‑5.81) 6.25 (5.83‑6.67) 7.35 (6.83‑7.86) 8.23 (7.63‑8.80) 9.12 (8.44‑9.76) 10.0 (9.26‑10.7) 11.3 (10.4‑12.1) 12.3 (11.2‑13.2) 7-day 4.23 (3.99‑4.51) 5.05 (4.76‑5.38) 6.15 (5.78‑6.54) 7.01 (6.59‑7.46) 8.20 (7.68‑8.72) 9.15 (8.54‑9.73) 10.1 (9.41‑10.8) 11.1 (10.3‑11.8) 12.4 (11.5‑13.3) 13.5 (12.4‑14.4) 10-day 4.84 (4.57‑5.13) 5.75 (5.43‑6.09) 6.91 (6.52‑7.32) 7.82 (7.37‑8.28) 9.03 (8.49‑9.57) 9.99 (9.38‑10.6) 11.0 (10.3‑11.6) 11.9 (11.1‑12.7) 13.3 (12.3‑14.1) 14.3 (13.2‑15.2) 20-day 6.50 (6.18‑6.84) 7.67 (7.29‑8.07) 9.06 (8.60‑9.52) 10.2 (9.62‑10.7) 11.6 (11.0‑12.2) 12.8 (12.1‑13.4) 13.9 (13.1‑14.7) 15.1 (14.2‑15.9) 16.7 (15.6‑17.6) 17.9 (16.7‑19.0) 30-day 8.02 (7.65‑8.42) 9.44 (8.99‑9.89) 11.0 (10.4‑11.5) 12.1 (11.6‑12.7) 13.7 (13.0‑14.3) 14.9 (14.1‑15.6) 16.1 (15.2‑16.9) 17.2 (16.3‑18.1) 18.8 (17.7‑19.8) 20.0 (18.7‑21.1) 45-day 10.1 (9.69‑10.6) 11.8 (11.3‑12.3) 13.5 (12.9‑14.1) 14.8 (14.2‑15.4) 16.5 (15.7‑17.2) 17.8 (16.9‑18.5) 19.0 (18.1‑19.8) 20.2 (19.2‑21.1) 21.8 (20.6‑22.8) 23.0 (21.7‑24.1) 60-day 12.0 (11.6‑12.5) 14.0 (13.5‑14.6) 15.9 (15.2‑16.5) 17.3 (16.6‑17.9) 19.1 (18.3‑19.8) 20.4 (19.5‑21.2) 21.7 (20.7‑22.6) 23.0 (21.9‑23.9) 24.6 (23.4‑25.7) 25.8 (24.5‑27.0) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top 9/20/2017 Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.5603&lon=-80.4590&data=intensity&units=english&series=pds 1/4 NOAA Atlas 14, V olume 2, Version 3 Location name: Salisbury , North Carolina, USA * Latitude: 35.5603°, Longitude: -80.459° Elevation: 805.12 ft** * source: ESRI Maps ** source: USGS POINT PRECIPITATION FREQUENCY ESTIMATES G.M. Bonnin, D. Martin, B. Lin, T. Parzybok, M.Yekta, and D. Riley NOAA, National Weather Service, Silver Spring, Maryland PF_tabular | PF_graphical | Maps_&_aerials PF tabular PDS-based point precipitation frequency estimates with 90% confidence intervals (in inches /hour ) 1 Duration Average recurrence interval (years) 1 2 5 10 25 50 100 200 500 1000 5-min 4.69 (4.32‑5.09) 5.54 (5.11‑6.04) 6.47 (5.95‑7.03) 7.10 (6.52‑7.70) 7.82 (7.14‑8.47) 8.29 (7.54‑8.99) 8.71 (7.88‑9.44) 9.07 (8.16‑9.84) 9.46 (8.42‑10.3) 9.71 (8.58‑10.6) 10-min 3.74 (3.46‑4.07) 4.43 (4.09‑4.83) 5.18 (4.76‑5.63) 5.68 (5.21‑6.16) 6.23 (5.69‑6.74) 6.61 (6.01‑7.15) 6.92 (6.26‑7.50) 7.19 (6.47‑7.80) 7.48 (6.67‑8.12) 7.64 (6.76‑8.32) 15-min 3.12 (2.88‑3.39) 3.72 (3.43‑4.04) 4.36 (4.02‑4.75) 4.79 (4.40‑5.20) 5.26 (4.81‑5.70) 5.58 (5.07‑6.04) 5.84 (5.28‑6.32) 6.05 (5.44‑6.56) 6.27 (5.59‑6.82) 6.40 (5.66‑6.96) 30-min 2.14 (1.97‑2.32) 2.57 (2.37‑2.79) 3.10 (2.85‑3.37) 3.47 (3.19‑3.76) 3.90 (3.56‑4.22) 4.20 (3.82‑4.55) 4.47 (4.04‑4.84) 4.71 (4.24‑5.11) 4.99 (4.45‑5.43) 5.18 (4.58‑5.63) 60-min 1.33 (1.23‑1.45) 1.61 (1.49‑1.75) 1.99 (1.83‑2.16) 2.26 (2.07‑2.45) 2.60 (2.37‑2.81) 2.85 (2.59‑3.08) 3.08 (2.78‑3.33) 3.30 (2.97‑3.58) 3.58 (3.19‑3.89) 3.78 (3.34‑4.11) 2-hr 0.772 (0.708‑0.842) 0.934 (0.856‑1.02) 1.16 (1.06‑1.27) 1.33 (1.21‑1.45) 1.55 (1.41‑1.68) 1.71 (1.54‑1.86) 1.87 (1.68‑2.03) 2.02 (1.80‑2.20) 2.22 (1.96‑2.42) 2.36 (2.07‑2.59) 3-hr 0.548 (0.503‑0.598) 0.661 (0.608‑0.723) 0.826 (0.757‑0.901) 0.950 (0.868‑1.03) 1.11 (1.01‑1.21) 1.24 (1.12‑1.35) 1.37 (1.23‑1.48) 1.49 (1.33‑1.62) 1.66 (1.46‑1.81) 1.79 (1.55‑1.95) 6-hr 0.333 (0.306‑0.364) 0.401 (0.369‑0.439) 0.501 (0.459‑0.547) 0.578 (0.528‑0.630) 0.681 (0.618‑0.740) 0.762 (0.687‑0.827) 0.844 (0.755‑0.915) 0.926 (0.821‑1.00) 1.04 (0.907‑1.13) 1.12 (0.970‑1.22) 12-hr 0.196 (0.180‑0.213) 0.236 (0.217‑0.258) 0.296 (0.272‑0.323) 0.343 (0.314‑0.374) 0.407 (0.370‑0.442) 0.459 (0.413‑0.497) 0.512 (0.457‑0.553) 0.566 (0.500‑0.611) 0.641 (0.557‑0.691) 0.700 (0.599‑0.755) 24-hr 0.117 (0.109‑0.126) 0.141 (0.131‑0.152) 0.177 (0.165‑0.190) 0.205 (0.191‑0.220) 0.243 (0.225‑0.261) 0.273 (0.253‑0.294) 0.304 (0.281‑0.327) 0.336 (0.309‑0.361) 0.380 (0.348‑0.409) 0.414 (0.378‑0.446) 2-day 0.068 (0.063‑0.073) 0.082 (0.076‑0.088) 0.102 (0.095‑0.109) 0.118 (0.110‑0.126) 0.139 (0.129‑0.149) 0.156 (0.144‑0.167) 0.173 (0.160‑0.185) 0.190 (0.175‑0.204) 0.214 (0.196‑0.230) 0.233 (0.213‑0.250) 3-day 0.048 (0.045‑0.052) 0.058 (0.054‑0.062) 0.072 (0.067‑0.077) 0.083 (0.077‑0.088) 0.097 (0.090‑0.104) 0.109 (0.101‑0.117) 0.121 (0.112‑0.129) 0.133 (0.123‑0.143) 0.150 (0.137‑0.161) 0.163 (0.149‑0.175) 4-day 0.038 (0.036‑0.041) 0.046 (0.043‑0.049) 0.057 (0.053‑0.061) 0.065 (0.061‑0.070) 0.077 (0.071‑0.082) 0.086 (0.079‑0.092) 0.095 (0.088‑0.102) 0.105 (0.096‑0.112) 0.118 (0.108‑0.126) 0.128 (0.117‑0.137) 7-day 0.025 (0.024‑0.027) 0.030 (0.028‑0.032) 0.037 (0.034‑0.039) 0.042 (0.039‑0.044) 0.049 (0.046‑0.052) 0.054 (0.051‑0.058) 0.060 (0.056‑0.064) 0.066 (0.061‑0.070) 0.074 (0.068‑0.079) 0.080 (0.074‑0.086) 10-day 0.020 (0.019‑0.021) 0.024 (0.023‑0.025) 0.029 (0.027‑0.030) 0.033 (0.031‑0.034) 0.038 (0.035‑0.040) 0.042 (0.039‑0.044) 0.046 (0.043‑0.048) 0.050 (0.046‑0.053) 0.055 (0.051‑0.059) 0.060 (0.055‑0.063) 20-day 0.014 (0.013‑0.014) 0.016 (0.015‑0.017) 0.019 (0.018‑0.020) 0.021 (0.020‑0.022) 0.024 (0.023‑0.025) 0.027 (0.025‑0.028) 0.029 (0.027‑0.031) 0.031 (0.030‑0.033) 0.035 (0.033‑0.037) 0.037 (0.035‑0.040) 30-day 0.011 (0.011‑0.012) 0.013 (0.012‑0.014) 0.015 (0.014‑0.016) 0.017 (0.016‑0.018) 0.019 (0.018‑0.020) 0.021 (0.020‑0.022) 0.022 (0.021‑0.023) 0.024 (0.023‑0.025) 0.026 (0.025‑0.027) 0.028 (0.026‑0.029) 45-day 0.009 (0.009‑0.010) 0.011 (0.010‑0.011) 0.013 (0.012‑0.013) 0.014 (0.013‑0.014) 0.015 (0.015‑0.016) 0.016 (0.016‑0.017) 0.018 (0.017‑0.018) 0.019 (0.018‑0.020) 0.020 (0.019‑0.021) 0.021 (0.020‑0.022) 60-day 0.008 (0.008‑0.009) 0.010 (0.009‑0.010) 0.011 (0.011‑0.011) 0.012 (0.012‑0.012) 0.013 (0.013‑0.014) 0.014 (0.014‑0.015) 0.015 (0.014‑0.016) 0.016 (0.015‑0.017) 0.017 (0.016‑0.018) 0.018 (0.017‑0.019) 1 Precipitation frequency (PF) estimates in this table are based on frequency analysis of partial duration series (PDS). Numbers in parenthesis are PF estimates at lower and upper bounds of the 90% confidence interval. The probability that precipitation frequency estimates (for a given duration and average recurrence interval) will be greater than the upper bound (or less than the lower bound) is 5%. Estimates at upper bounds are not checked against probable maximum precipitation (PMP) estimates and may be higher than currently valid PMP values. Please refer to NOAA Atlas 14 document for more information. Back to Top 9/20/2017 Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.5603&lon=-80.4590&data=depth&units=english&series=pds 2/4 PF graphical Back to Top Maps & aerials Small scale terrain 9/20/2017 Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.5603&lon=-80.4590&data=depth&units=english&series=pds 3/4 Large scale terrain Large scale map Large scale aerial + – 3km 2mi + – 100km 60mi + – 100km 60mi 9/20/2017 Precipitation Frequency Data Server https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_printpage.html?lat=35.5603&lon=-80.4590&data=depth&units=english&series=pds 4/4 Back to Top US Department of Commerce National Oceanic and Atmospheric Administration National Weather Service National Water Center 1325 East West Highway Silver Spring, MD 20910 Questions?: HDSC.Questions@noaa.gov Disclaimer + – 100km 60mi