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HomeMy WebLinkAboutWPO201900035 Calculations 2019-06-03 GLOECKNER ENGINEERING & SURVEYING INC. 2265 DECCA LANE HYDOLOGY & WATERSHED MODEL Based on VSMP & Site Plan Design Dated: 5-28-19 ��$ALTH O� O i( O U KURT M.GLOECKNER Lie.No.005649 6/Z$it SSIGNALE G� GLOECKNER ENGINEERING/SURVEYING INC. 1 980 FOX RUN LANE • CHARLOTTESVILLE, VA. 22901 PHONE: (434)-97 1-1 59 1 • FAX: (434)-293-76 1 2 1 Watershed Model Schematic Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 PRE-DEVELOPMENT INFLOW (SCS HYDROLOGY) �--�' ) DRAINAGE AREA= 3.79 AC. ON=66 Tc= 5 MIN 02=5.50 CFS Q10=13.4 CFS Q100=30.8 CFS POST-DEVELOPMENT INFLOW(SCS HYDROLOGY) DRAINAGE AREA=4.09 AC. C N=67 Tc= 5 M I N 02=6.34 CFS Q10=15.02 CFS "EX. POND" l Q100=34.03 CFS !" J � "NEW POND" EXISTING WET POND DISCHARGE (PREDEVELOPMENT PEAKS) Q2=1.42 CFS Q10=5.61 CFS REFER TO SHEET 6 AND 9 FOR EXISTING AND PROPOSED POND V HYDRAUIC INFORMATION v.l 4e. NEW WET POND DISCHARGE (POSTDEVELOPMENT PEAKS) Q2=0.18 CFS < 1.42 CFS (OK) Q10=3.11 CFS < 5.61 CFS (OK) 2265 DECCA LANE Leaend HYDROLOGIC AND HYDRAULIC Hyd. Origin Description BOOKLET 1 SCS Runoff PRE-DEV MAY 28, 2019 2 Reservoir PRE-DEV ROUTING 3 SCS Runoff POST-DEV HYROGRAPH 4 Reservoir POST-DEV ROUTING Project: DECCA POND ROUTING.gpw Tuesday, 05/28/2019 2 Hydrograph Return Period Rhy�atiaao�ydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Hyd. Hydrograph Inflow Peak Outflow(cfs) Hydrograph No. type hyd(s) Description (origin) 1-yr 2-yr 3-yr 5-yr 10-yr 25-yr 50-yr 100-yr 1 SCS Runoff — 3.251 5.503 13.39 30.79 PRE-DEV 2 Reservoir 1 0.610 1.420 5.608 0.000 PRE-DEV ROUTING 3 SCS Runoff — 3.837 6.340 15.02 — — 34.03 POST-DEV HYROGRAPH 4 Reservoir 3 0.000 0.179 3.108 — 21.82 POST-DEV ROUTING Proj. file: DECCA POND ROUTING.gpw Tuesday, 05/28/2019 3 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 1 PRE-DEV Hydrograph type = SCS Runoff Peak discharge = 5.503 cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 11,318 cuft Drainage area = 3.790 ac Curve number = 66 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 3.30 min Total precip. = 3.64 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 PRE-DEV 0 (cfs) Hyd. No. 1 —2 Year 0 (cfs) 6.00 I 6.00 5.00 5.00 4.00 4.00 3.00 - 3.00 2.00 2.00 1.00 1.00 0.00 - - 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time(min) 4 TR55 Tc Worksheet Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Hyd. No. 1 PRE-DEV Description A B C Totals Sheet Flow Manning's n-value = 0.050 0.011 0.011 Flow length (ft) = 83.0 0.0 0.0 Two-year 24-hr precip. (in) = 3.64 0.00 0.00 Land slope (%) = 4.00 0.00 0.00 Travel Time (min) = 2.49 + 0.00 + 0.00 = 2.49 Shallow Concentrated Flow Flow length (ft) = 252.00 0.00 0.00 Watercourse slope (%) = 20.00 0.00 0.00 Surface description = Unpaved Paved Paved Average velocity (ft/s) =7.22 0.00 0.00 Travel Time (min) = 0.58 + 0.00 + 0.00 = 0.58 Channel Flow X sectional flow area (sqft) = 4.00 0.00 0.00 Wetted perimeter(ft) = 3.00 0.00 0.00 Channel slope (%) = 21.00 0.00 0.00 Manning's n-value = 0.030 0.015 0.015 Velocity (ft/s) =27.60 0.00 0.00 Flow length (ft) ({0})363.0 0.0 0.0 Travel Time (min) = 0.22 + 0.00 + 0.00 = 0.22 Total Travel Time, Tc 3.30 min 5 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 2 PRE-DEV ROUTING Hydrograph type = Reservoir Peak discharge = 1.420 cfs Storm frequency = 2 yrs Time to peak = 726 min Time interval = 2 min Hyd. volume = 11,315 cuft Inflow hyd. No. = 1 - PRE-DEV Max. Elevation = 479.19 ft Reservoir name = EX POND Max. Storage = 3,062 cuft Storage Indication method used. PRE-DEV ROUTING Q (cfs) Hyd. No. 2 --2 Year Q (cfs) 6.00 6.00 5.00 - - 5.00 4.00 4.00 3.00 3.00 2.00 2.00 1.00 1.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time(min) Hyd No. 2 Hyd No. 1 Total storage used = 3,062 cuft Pond Report 6 Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Pond No. 2 - EX POND Pond Data Contours-User-defined contour areas.Conic method used for volume calculation.Begining Elevation=479.00 ft Stage/Storage Table Stage(ft) Elevation(ft) Contour area(sqft) Incr.Storage(cuft) Total storage(cuft) 0.00 479.00 14,049 0 0 1.00 480.00 17,800 15,886 15,886 Culvert/Orifice Structures Weir Structures [A] [B] [C] [PrfRsr] [A] [B] [C] [D] Rise(in) = 0.00 0.00 0.00 0.00 Crest Len(ft) = 5.00 0.00 0.00 0.00 Span(in) = 0.00 0.00 0.00 0.00 Crest El.(ft) = 479.00 0.00 0.00 0.00 No.Barrels = 0 0 0 0 Weir Coeff. = 3.33 3.33 3.33 3.33 Invert El.(ft) = 0.00 0.00 0.00 0.00 Weir Type = Red - - - Length(ft) = 0.00 0.00 0.00 0.00 Multi-Stage = No No No No Slope(%) = 0.00 0.00 0.00 n/a N-Value = .013 .013 .013 n/a Orifice Coeff. = 0.60 0.60 0.60 0.60 Exfil.(in/hr) = 0.000(by Wet area) Multi-Stage = n/a No No No TW Elev.(ft) = 0.00 Note Culvert/Or-thee outflows are analyzed under inlet(lc)and outlet(oc)control Weir nsers checked for orifice conditions(lc)and submergence(s). Stage(ft) Stage/Discharge Elev(ft) 1.00 480.00 0.90 479.90 0.80 479.80 0.70 479.70 0.60 479.60 0.50 479.50 0.40 479.40 0.30 - 479.30 0.20 I 479.20 0.10 479.10 0.00 479.00 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 18.00 Discharge(cfs) Total Q 7 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 3 POST-DEV HYROGRAPH Hydrograph type = SCS Runoff Peak discharge = 6.340 cfs Storm frequency = 2 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 12,943 cuft Drainage area = 4.090 ac Curve number = 67 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 3.64 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 POST-DEV HYROGRAPH Q (cfs) Hyd. No. 3—2 Year Q (cfs) 7.00 7.00 6.00 6.00 5.00 5.00 4.00 I 4.00 3.00 - 3.00 2.00 - 2.00 1.00 1.00 0.00 - '- - 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 3 Time(min) 8 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD8 Civil 3D8 2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 4 POST-DEV ROUTING Hydrograph type = Reservoir Peak discharge = 0.179 cfs Storm frequency = 2 yrs Time to peak = 952 min Time interval = 2 min Hyd. volume = 4,080 cuft Inflow hyd. No. = 3 - POST-DEV HYROGRAPH Max. Elevation = 473.01 ft Reservoir name = NEW POND Max. Storage = 9,052 cuft Storage Indication method used. POST-DEV ROUTING Q (cfs) Hyd. No. 4--2 Year Q (cfs) 7.00 7.00 6.00 — 6.00 5.00 5.00 4.00 4.00 3.00 3.00 2.00 2.00 1.00 1.00 0.00 '' 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time(min) Hyd No. 4 Hyd No. 3 Total storage used = 9,052 cuft Pond Report 9 Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Pond No. 1 - NEW POND Pond Data Contours-User-defined contour areas.Conic method used for volume calculation.Begining Elevation=472.50 ft Stage/Storage Table Stage(ft) Elevation(ft) Contour area(sqft) Incr.Storage(cuft) Total storage(cuft) 0.00 472.50 15,344 0 0 2.50 475.00 20,216 44,306 44,306 4.50 477.00 25,135 45,257 89,563 Culvert/Orifice Structures Weir Structures [A] [B] [C] [PrfRsr] [A] [B] [C] [D] Rise(in) = 0.00 0.00 0.00 0.00 Crest Len(ft) = 10.00 0.00 0.00 0.00 Span(in) = 0.00 0.00 0.00 0.00 Crest El.(ft) = 473.00 0.00 0.00 0.00 No.Barrels = 0 0 0 0 Weir Coeff. = 3.33 3.33 3.33 3.33 Invert El.(ft) = 0.00 0.00 0.00 0.00 Weir Type = Rect - - - Length(ft) = 0.00 0.00 0.00 0.00 Multi-Stage = No No No No Slope(%) = 0.00 0.00 0.00 n/a N-Value = .013 .013 .013 n/a Orifice Coeff. = 0.60 0.60 0.60 0.60 Exfil.(in/hr) = 0.000(by Contour) Multi-Stage = n/a No No No TW Elev.(ft) = 0.00 Note Culvert/Orifice outflows are analyzed under inlet(lc)and outlet(oc)control.Weir risers checked for orifice conditions(ic)and submergence(s) Stage(ft) Stage/Discharge Elev(ft) 5.00 477.50 4.00 476.50 3.00 475.50 2.00 474.50 1.00 473.50 0.00 472.50 0.0 30.0 60.0 90.0 120.0 150.0 180.0 210.0 240.0 270.0 Total Q Discharge(cfs) 10 Hydrograph Report Hydraflow liydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 1 PRE-DEV Hydrograph type = SCS Runoff Peak discharge = 13.39 cfs Storm frequency = 10 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 26,782 cuft Drainage area = 3.790 ac Curve number = 66 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 3.30 min Total precip. = 5.50 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 PRE-DEV Q (cfs) Hyd. No. 1 — 10 Year Q (cfs) 14.00 14.00 12.00 12.00 10.00 10.00 8.00 8.00 6.00 6.00 4.00 4.00 2.00 2.00 0.00 -- ` - 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 1 Time(min) 11 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 2 PRE-DEV ROUTING Hydrograph type = Reservoir Peak discharge = 5.608 cfs Storm frequency = 10 yrs Time to peak = 722 min Time interval = 2 min Hyd. volume = 26,779 cuft Inflow hyd. No. = 1 - PRE-DEV Max. Elevation = 479.49 ft Reservoir name = EX POND Max. Storage = 7,678 cuft Storage Indication method used. PRE-DEV ROUTING Q (cfs) Hyd. No. 2 — 10 Year Q (cfs) 14.00 14.00 12.00 12.00 10.00 10.00 8.00 . 8.00 6.00 6.00 4.00 4.00 2.00 2.00 0.00 — 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time(min) Hyd No. 2 Hyd No. 1 III I ! Total storage used = 7,678 cult 12 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 3 POST-DEV HYROGRAPH Hydrograph type = SCS Runoff Peak discharge = 15.02 cfs Storm frequency = 10 yrs Time to peak = 718 min Time interval = 2 min Hyd. volume = 30,055 cuft Drainage area = 4.090 ac Curve number = 67 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 5.50 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 POST-DEV HYROGRAPH Q (cfs) Hyd. No. 3— 10 Year Q (cfs) 18.00 18.00 15.00 15.00 12.00 12.00 9.00 9.00 6.00 6.00 3.00 3.00 0.00 -- k - 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Hyd No. 3 Time(min) 13 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D8 2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 4 POST-DEV ROUTING Hydrograph type = Reservoir Peak discharge = 3.108 cfs Storm frequency = 10 yrs Time to peak = 726 min Time interval = 2 min Hyd. volume = 21,193 cuft Inflow hyd. No. = 3 - POST-DEV HYROGRAPH Max. Elevation = 473.19 ft Reservoir name = NEW POND Max. Storage = 12,169 cuft Storage Indication method used. POST-DEV ROUTING Q (cfs) Hyd. No. 4-- 10 Year Q (cfs) 18.00 18.00 15.00 15.00 12.00 12.00 9.00 9.00 6.00 6.00 3.00 3.00 0.00 -- 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time(min) Hyd No. 4 Hyd No. 3 I Total storage used = 12,169 cuft 14 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 1 PRE-DEV Hydrograph type = SCS Runoff Peak discharge = 30.79 cfs Storm frequency = 100 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 62,326 cuft Drainage area = 3.790 ac Curve number = 66 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = TR55 Time of conc. (Tc) = 3.30 min Total precip. = 8.99 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 PRE-DEV Q (cfs) Hyd. No. 1 -- 100 Year Q (cfs) 35.00 35.00 30.00 30.00 25.00 25.00 20.00 - 20.00 15.00 15.00 10.00 10.00 5.00 5.00 0.00 — 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Hyd No. 1 Time(min) 15 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 2 PRE-DEV ROUTING Hydrograph type = Reservoir Peak discharge = 0.000 cfs Storm frequency = 100 yrs Time to peak = n/a Time interval = 2 min Hyd. volume = 0 cuft Inflow hyd. No. = 1 - PRE-DEV Max. Elevation = 0.00 ft Reservoir name = EX POND Max. Storage = 0 cuft Storage Indication method used. PRE-DEV ROUTING Q (cfs) Hyd. No. 2— 100 Year Q (cfs) 35.00 35.00 30.00 30.00 25.00 25.00 20.00 - 20.00 15.00 15.00 10.00 10.00 5.00 5.00 0.00 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Time(min) Hyd No. 2 Hyd No. 1 I Total storage used = 0 cuft 16 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 3 POST-DEV HYROGRAPH Hydrograph type = SCS Runoff Peak discharge = 34.03 cfs Storm frequency = 100 yrs Time to peak = 716 min Time interval = 2 min Hyd. volume = 68,977 cuft Drainage area = 4.090 ac Curve number = 67 Basin Slope = 0.0 % Hydraulic length = 0 ft Tc method = User Time of conc. (Tc) = 5.00 min Total precip. = 8.99 in Distribution = Type II Storm duration = 24 hrs Shape factor = 484 POST-DEV HYROGRAPH Q (cfs) Hyd. No. 3-- 100 Year Q (cfs) 35.00 35.00 30.00 30.00 25.00 1 25.00 20.00 20.00 15.00 15.00 10.00 10.00 5.00 5.00 - 0.00 - ,' ' 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 Hyd No. 3 Time(min) 17 Hydrograph Report Hydraflow Hydrographs Extension for AutoCAD®Civil 3D®2018 by Autodesk,Inc.v2018.3 Tuesday,05/28/2019 Hyd. No. 4 POST-DEV ROUTING Hydrograph type = Reservoir Peak discharge = 21.82 cfs Storm frequency = 100 yrs Time to peak = 722 min Time interval = 2 min Hyd. volume = 60,115 cuft Inflow hyd. No. = 3 - POST-DEV HYROGRAPH Max. Elevation = 473.77 ft Reservoir name = NEW POND Max. Storage = 22,226 cuft Storage Indication method used. POST-DEV ROUTING Q (cfs) Hyd. No. 4-- 100 Year Q (cfs) 35.00 35.00 30.00 30.00 25.00 25.00 20.00 20.00 15.00 - 15.00 10.00 10.00 5.00 5.00 0.00 — I 0.00 0 120 240 360 480 600 720 840 960 1080 1200 1320 1440 1560 Time(min) Hyd No.4 Hyd No. 3 1 Total storage used = 22,226 cuft