2025 02 Drainage Statement Signed

2025-01 HydroCAD NOAA 24-hr D 100-Year Rainfall=8.66" 2025-01 HydroCAD NOAA 24-hr D 100-Year Rainfall=8.66" Prepared by Dynamic Engineering Printed 2/21/2025 Prepared by Dynamic Engineering Printed 2/21/2025 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 44 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 45 Hydrograph for Subcatchment 2S: Existing Pervious Summary for Subcatchment 3S: Proposed Impervious Time Precip. Excess Runoff | Time Precip. Excess Runoff [49] Hint: To<2at may require smaller dt heute) inches) inches) (cs) routs) {nehes) nehes} ics) [47] Hint: Peak is 107% of capacity of segment #4 [47] Hint: Peak is 120% of capacity of segment #6 nee oo | 3889 eB BF ooo [47] Hint: Peak is 120% of capacity of segment #7 33 Oa (Bbo coy | seep Bee oe $80 Runoff = —7.14cfs@ 12.10 hrs, Volume= 0.591 af, Depth= 8.42" 250 027 0.00 ooo | 2850 866 5.04 0.00 Routed to Link 6L : Proposed Total 3.00 033 0.00 0.00 | 29.00 866 5.04 0.00 350 039 0.00 0.00 | 2950 886 5.04 0.00 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30.00 hrs, dt= 0.05 hrs 400 0.45 0.00 0.00 | 30.00 866 5.04 0.00 NOAA 24-hr D_100-Year Rainfall=8.66" 450 0.52 0.00 0.00 500 059 900 9.00 Area (sf)_CN Description 850 O68 0.00 4 36,670 98 Unconnected pavement, HSG B 650 082 0.00 0.00 36,670 100.00% Impervious Area 700 091 0.00 0.00 36,670 100.00% Unconnected 750 1.01 0.01 0.00 800 112 0.02 0.01 Te Length Slope Velocity Capacity Description 850 1.24 0.03 0.01 (min) (feet) (ft) (ft/sec) (cfs) 30 133 O08 O02 34 21 0.0150 0.11 Sheet Flow, Sheet Flow - AB Grass: Short n= 0.150 P2= 3.35" so evar oe Os 05 43 0.0300 1.40 Sheet Flow, Sheet Flow - BC yoo 22k 008 ‘Smooth surfaces n= 0.011 P2=3.35" 1150 278 (O58 01s 03 35 0.0082 1.84 Shallow Concentrated Flow, SCF - Paved -CD 12.00 4.15 1.43 0.86 Paved Kv= 20.3 fps 1250 591 274 0.32 04 59 0.0252 8.51 6.68 Pipe Channel, Pipe Flow - DE 13.00 641 3.13 0.17 12.0" Round Area= 0.8 sf Perim=3.1' r= 0.25! 13.50 6.72 3.39 0.14 0.011 Concrete pipe, straight & clean 1400 694 3.57 0.09 0.2 111 0.0300 929 7.29 ‘Pipe Channel, Pipe Flow - EF 1450 713 3.73 0.08 12.0" Round Area= 0.8 sf Perim=3.1' r= 0.25) 15.00 7.29 3.86 0.06 n= 0.011 Concrete pipe, straight & clean 15.50 7.42 3.97 0.06 O41 48 0.0200 7.58 5.95 Pipe Channel, Pipe Flow - FG 1600 Tek 4.07 0.05 12.0" Round Area= 0.8 sf Perim= 3.1" r= 0.25' q830

7.29 3.86 0.06 n= 0.011 Concrete pipe, straight & clean 15.50 7.42 3.97 0.06 O41 48 0.0200 7.58 5.95 Pipe Channel, Pipe Flow - FG 1600 Tek 4.07 0.05 12.0" Round Area= 0.8 sf Perim= 3.1" r= 0.25' q830 e848 oes n= 0,011 Concrete pipe, straight & clean 50 784 AGS 004 a4 26 0.0200 7.58 5.95 Pipe Channel, Pipe Flow - GH 4800 792 440 0.04 12.0" Round Area= 0.8 sf Perim=3.1' r= 0.25! 1850 800 4.46 0.03 0.011 Concrete pipe, straight & clean 1900 807 4.52 0.03 0.0 27 0.0300 10.78 13.22 ipe Flow - HI 19.50 8.14 4.58 0.03 15.0" Round Area= 1.2 sf Perim=3.9' r= 0.31" 2000 821 464 0,03 n= 0,011 Concrete pipe, straight & clean 2050 827 470 0.03 44370 Tolar 2100 833 475 0.03 2150 839 480 0.03 2200 845 4.86 0.03 2250 851 4.90 0.02 2300 856 4.95 0.02 2350 861 499 0.02 2400 866 5.04 0.02 2450 866 5.04 0.00 25.00 866 5.04 0.00 25.50 866 5.04 0.00