2025 02 Drainage Statement Signed

2025-01 HydroCAD NOAA 24-hr D 10-Year Rainfall=5.22" 2025-01 HydroCAD NOAA 24-hr D 10-Year Rainfall=5.22" 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 28 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 29 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 (hours) Gnehes)_ ches) (cis) | (hours) (inches) (inches) cfs) 9.00 0.00 0.00 0.00 | 26.00 5.22 2.20 0.00 Runoff = 4.29 cfs @ 12.10 hrs, Volume= 0.350 af, Depth= 4.98" 0.80 0.03 0.00 0.00 | 26.50 5.22 2.20 0.00 Routed to Link 6L : Proposed Total 1,00 0.06 0.00 0.00 27.00 5.22 2.20 0.00 x30 OS3(Oibo coy | seep feb Ge $80 Runoff by SCS TR-Z0 method, UH-SCS, Weighted-CN, Time Span= 0.00-30.00 hs, d= 0.05 hrs 250 0.16 0.00 0.00 28.50 5.22 2.20 0.00 NOAA 24-hr D 10-Year Rainfal 3.00 020 0.00 0.00 | 2900 522 220 0.00 3.50 0.23 0.00 0.00 2950 522 220 0.00 Area (sf) CN __ Description 430 ° a ° oo ° oo 30.00 5.22 2.20 0.00 36,670 98 __Unconnected pavement, HSG B. . 36,670 10.00% Impervious Area 5.00 0.36 0.00 0.00 94 pn py Ooo 36,670 100.00% Unconnected 82 ods 00 O00 Te Length Slope Velocity Capacity Description 7.00 0.55 0,00 0.00 (min) (feet) _(fft) (ft/sec) (cfs) 750 061 0.00 0.00 34 21 0.0150 0.11 Sheet Flow, Sheet Flow - AB 8.00 0.68 0.00 0.00 Grass: Short n= 0.150 P2= 3.35" 8.50 0.75 0.00 0.00 0.5 43 0.0300 1.40 Sheet Flow, Sheet Flow - BC 30 o8o O00 O00 ‘Smooth surfaces n=0,011 P2= 3.35" 40.00 1.03 001 0.00 0.3 35 0.0082 1.84 Peel Keohane Flow, SCF - Paved -CD ito 136 Os boz 04 59 0.0252 851 668 Pipe Channel, Pipe Flow - DE 11.50 1.65 0.13, 0.05 12.0" Round Area= 0.8 sf Perim=3.1' r= 0.25" i200 250 046 0.38 n= 0.011 Concrete pipe, straight & clean 1250 357 105 018 0.2 111 0.0300 9.29 ~—7.29- Pipe Channel, Pipe Flow - EF 13.00 3.86 1.24 0.08 12.0" Round Area= 0.8 sf Perim=3.1' r=0.25' 13.50 4.05 1.36 0.06 0.011 Concrete pipe, straight & clean 14.00 4.19 1.45 0.05 0.1 48 0.0200 7.58 5.95 Pipe Channel, Pipe Flow - FG 14.50 4.30 1.53 0.04 12. Round Area= 0.8 sf Perim= 3.1" r=0.25' 15.00 4.39 1.60 0.03 n= 0.011 Concrete pipe, straight & clean 15.50 4.47 1.65 0.03 0.4 26 0.0200 7.58 5.95 Pipe Channel, Pipe Flow - GH 16.00

4.30 1.53 0.04 12. Round Area= 0.8 sf Perim= 3.1" r=0.25' 15.00 4.39 1.60 0.03 n= 0.011 Concrete pipe, straight & clean 15.50 4.47 1.65 0.03 0.4 26 0.0200 7.58 5.95 Pipe Channel, Pipe Flow - GH 16.00 454 1 ” 0. os 12.0" Round Area= 0.8 sf Perim=3.1' r=0.25' oe ee oes n= 0.011 Concrete pipe, straight & clean 1750 «473~—«188 002 0.0 27 0.0300 10.78 13.22 Pipe Channel, Pipe Flow - HI jaoo 47718? 0.02 15.0" Round Area= 1.2 sf Perim= 3.9" r= 0.31" 1850 482 190 002 n= 0.011 Concrete pipe, straight & clean 19.00 4.86 1.94 0.02 44 370 Total 19.50 4.91 1.97 0.02 20.00 495 2.00 0.02 2050 499 © 2.03 0.01 2100 5022.05 0.01 21.50 5.06 2.08 0.01 22.00 5.09 211 0.01 2250 513 2.13 0.01 2300 518 2.16 0.01 2350 519 218 0.01 24.00 5.22 2.20 0.01 24.50 5.22 2.20 0.00 25.00 5.22 2.20 0.00 25.50 5.22 2.20 0.00