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HomeMy WebLinkAboutWPO201700032 Calculations WPO VSMP 2017-04-18 Northtown IIB- Early Grading Permit SWM Detention 17 BasinFlow printout INPUT: Basin: Northtown Phase IIB- Early Grading Permit SWM Detention 5 Contour Areas Elevation(ft) Area(sf) Computed Vol.(cy) 450.50 1607.00 0.0 452.00 2527.00 113.9 454.00 3852.00 348.4 456.00 5288.00 685.5 458.00 5743.00 1094.0 Start_Elevation(ft) 450.50 Vol. (cy) 0.00 5 Outlet Structures Outlet structure 0 Orifice name: Barrel area (sf) 1.227 diameter or depth (in) 15.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 447.000 multiple 1 discharge out of riser Outlet structure 1 Orifice name: Low-Flow Orifice area (sf) 0.136 diameter or depth (in) 5.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 450.500 multiple 1 discharge into riser Outlet structure 2 Orifice name: Mid-Flow Orifice area (sf) 0.196 diameter or depth (in) 6.000 width for rect. (in) 0.000 coefficient 0.500 invert (ft) 454.250 multiple 4 discharge into riser Page 1 Northtown IIB- Early Grading Permit SWM Detention 17 Outlet structure 3 Weir name: Riser diameter (in) 24.000 side angle 0.000 coefficient 3.300 invert (ft) 455.660 multiple 1 discharge into riser transition at (ft) 0.608 orifice coef. 0.500 orifice area (sf) 3.142 Outlet structure 4 Weir name: emergency spillway length (ft) 40.000 side angle 0.000 coefficient 3.300 invert (ft) 457.000 multiple 1 discharge through dam 4 Inflow Hydrographs Hydrograph 0 SCS name: 1-yr, 24 hr Peak SCS Method Design Storm Area (acres) 2.880 CN 90.100 Type 2 rainfall, P (in) 3.500 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 7.895 peak time (hrs) 11.970 volume (cy) 950.509 Page 2 Northtown IIB- Early Grading Permit SWM Detention 17 Hydrograph 1 SCS name: 2-yr, 24 hr Peak SCS Method Design Storm Area (acres) 2.880 CN 90.100 Type 2 rainfall, P (in) 3.700 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 8.499 peak time (hrs) 11.970 volume (cy) 1023.225 Hydrograph 2 SCS name: 10-yr, 24 hr Peak SCS Method Design Storm Area (acres) 2.880 CN 90.100 Type 2 rainfall, P (in) 5.600 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 14.355 peak time (hrs) 11.970 volume (cy) 1728.299 Hydrograph 3 SCS name: 100-yr, 24 hr Peak SCS Method Design Storm Area (acres) 2.880 CN 90.100 Type 2 rainfall, P (in) 9.100 time of conc. (hrs) 0.1800 time increment (hrs) 0.0200 time limit (hrs) 30.000 fudge factor 1.00 routed true peak flow (cfs) 25.390 peak time (hrs) 11.970 volume (cy) 3056.960 Page 3 Northtown IIB- Early Grading Permit SWM Detention 17 OUTPUT: Routing Method: storage-indication Hydrograph 0 Routing Summary of Peaks: 1-yr, 24 hr Peak SCS Method Design Storm inflow (cfs) 7.895 at 11.96 (hrs) discharge (cfs) 1.024 at 12.36 (hrs) water level (ft) 454.215 at 12.40 (hrs) storage (cy) 379.631 Hydrograph 1 Routing Summary of Peaks: 2-yr, 24 hr Peak SCS Method Design Storm inflow (cfs) 8.499 at 11.96 (hrs) discharge (cfs) 1.306 at 12.30 (hrs) water level (ft) 454.383 at 12.30 (hrs) storage (cy) 404.901 Hydrograph 2 Routing Summary of Peaks: 10-yr, 24 hr Peak SCS Method Design Storm inflow (cfs) 14.355 at 11.96 (hrs) discharge (cfs) 4.607 at 12.16 (hrs) water level (ft) 455.659 at 12.16 (hrs) storage (cy) 620.301 Hydrograph 3 Routing Summary of Peaks: 100-yr, 24 hr Peak SCS Method Design Storm inflow (cfs) 25.390 at 11.96 (hrs) discharge (cfs) 15.035 at 12.10 (hrs) water level (ft) 456.956 at 12.10 (hrs) storage (cy) 876.565 Wed Apr 12 08:59:42 EDT 2017 Page 4