2025 02 Drainage Statement Signed

2025-01 HydroCAD NOAA 24-hr D 2-Year Rainfall=3.44" 2025-01 HydroCAD NOAA 24-hr D 2-Year Rainfall=3.44" 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 12 HydroCAD® 10.20-6a s/n 08640 © 2024 HydroCAD Software Solutions LLC Page 13 Hydrograph for Subcatchment 2S: Existing Pervious Summary for Subcatchment 3S: Proposed Impervious Time Precip. Excess Runoff | Time Precip. Excess Runoff. [49] Hint: To<2dt may require smaller dt (hours) (inches) (inches) (cls) | (hours) (inches) (inches) (fs) 9.00 0.00 0.00 0.00 | 26.00 3.44 (0.87 0.00 Runoff = 2.81 cfs@ 12.10 hrs, Volume= 0.225 af, Depth= 3.21" 0.80 0.02 0.00 0.00 | 26.50 344 0.97 0.00 Routed to Link 6L : Proposed Total 1,00 0.04 0.00 0.00 27.00 3.44 0.97 0.00 ry anny) coy | 3eeo baa ogy $80 Runoff by SCS TR-20 method, UH=SCS, Weighted-CN, Time Span= 0.00-30,00 hrs, dt= 0.05 hrs 250 0.11 0.00 0.00 28.50 3.44 0.97 0.00 NOAA 24-hr D 2-Year Rainfall=3.44" 3.00 013 0.00 0.00 | 2900 344 0.97 0.00 3.50 015 0.00 0.00 2950 3.44 0.97 0.00 Area (sf) CN __ Description 430 ° 4 ° oo ° oo 30.00 3.44 0.97 0.00 36,670 98 __Unconnected pavement, HSG B. . 36,670 10.00% Impervious Area 5.00 0.24 + 0.00 0.00 % Pe ny) 000 36,670 100.00% Unconnected 820 oa boo O00 Te Length Slope Velocity Capacity Description 7.00 0,36 0,00 0.00 (min) (feet) _(fft) (ft/sec) (cfs) 750 0.40 0.00 0.00 34 21 0.0150 0.11 Sheet Flow, Sheet Flow - AB 8.00 0.45, 0.00 0.00 Grass: Short n= 0.150 P2= 3.35" 8.50 0.49 0.00 0.00 0.5 43 0.0300 1.40 Sheet Flow, Sheet Flow - BC 30 Ser O00 O00 ‘Smooth surfaces n=0,011 P2= 3.35" 40.00 068. 0.00 0.00 0.3 35 0.0082 1.84 Peel Keohane Flow, SCF - Paved -CD {00088 Oo 000 01 59 0.0252 8.51 6.68 Pipe Channel, Pipe Flow - DE 11.50 1.09 0.01 0.01 12.0" Round Area= 0.8 sf Perim=3.1' r= 0.25" 4200 165 «(O12 0.13 n= 0.011 Concrete pipe, straight & clean 1250 235 039 0.07 0.2 111 0.0300 9.29 ~—7.29- Pipe Channel, Pipe Flow - EF 13.00 2.55 0.48 0.04 12.0" Round Area= 0.8 sf Perim=3.1' r=0.25' 13.50 2.67 0.54 0.03 0.011 Concrete pipe, straight & clean 14.00 2.76 0.58 0.02 0.1 48 0.0200 7.58 5.95 Pipe Channel, Pipe Flow - FG 14.50 2.83 0.62 0.02 12. Round Area= 0.8 sf Perim= 3.1" r=0.25' 15.00 289 0.66 0.02 n= 0.011 Concrete pipe, straight & clean 15.50 295 0.68 004 0.4 26 0.0200 7.58 5.95 Pipe Channel, Pipe

ipe Flow - FG 14.50 2.83 0.62 0.02 12. Round Area= 0.8 sf Perim= 3.1" r=0.25' 15.00 289 0.66 0.02 n= 0.011 Concrete pipe, straight & clean 15.50 295 0.68 004 0.4 26 0.0200 7.58 5.95 Pipe Channel, Pipe Flow - GH 16.00 2 id 0. 4 0. ot 12.0" Round Area= 0.8 sf Perim=3.1' r=0.25' st ey ae Oot n= 0.011 Concrete pipe, straight & clean 175031178 004 0.0 27 0.0300 10.78 13.22 Pipe Channel, Pipe Flow - HI 1800 315 (0.80 0.01 15.0" Round Area= 1.2 sf Perim=3.9' r= 0.31" 1850 318 081 001 n= 0.011 Concrete pipe, straight & clean 19:00 320 0.83 0.01 44 370 Total 19.50 3.23 0.85, 0.01 2000 326 086 0.01 2050 329 088 0.01 2100 331 089 0.01 21.50 3.33, 0.91 0.01 22.00 3.36 0.92 0.01 22.50 3.38 0.93 0.01 2300 340 095 0.01 2350 342 096 0.01 2400 3.44 © 0.97 0.01 24.50 3.44 0.97 0.00 25.00 3.44 0.97 0.00 2550 344 0.97 0.00