9606 19TH AVE SE PREMIER STORAGE 2025-07-29

Premitorage - 25 year rational method like sizing Storm Water Hydrology*Rational Method 1990 KC Pipe Flow Ra tonal Method Spreadsheet 100yr 25 yr Initail Tc= 6.3 a= 2.66 2.66 Watercourse types: Initial acres= 0 b= 0.65 0.65 1 Forest w/heavy gound litter Design Storm= 25 2 Minimum tillage cultivation Intensity= 25 3 Short grass pasture&lawns 4 Nearly bare ground 5 Grassed waterway 6 Paved area Time of concentration Calculation: Type Length %Slope Vel. (fps1 Time (min.) 6 50.00 3.00% 3.46 0.24 Pipe Run: CB#05 to CB#04 CB#04 to CB#03. CB#03 to CB#02 CB#01 to CB#01 Tc(min.)= 6.54 Tc(min)= 6.64 Tc(min.)= 6.93 Tc(min.)= 7.20 Area (acres)= 0.50 Area(acres) 0.50 Area (acres)= 0.30 Area(acres): 0.00 C= 0.9 C= 0.9 C= 0.9 C= 0.9 XAC= 0.45 _ EAC= 0.90 EAC= 1.17 EAC= 1.17 I= 1.96 1= 1.94 I= 1.89 I= 1.84 Q Design (cfs)= 0.88 Q Design (cfs)= 1.75 Q Design (cfs)= 2.21 Q Design (cfs)= 2.16 V Design (fps)= 5.14 V Design (fps)= 4.93 V Design (fps)= 6.15 V Design(fps): 5.01 Pipe: Pipe: Pipe: Pipe: Invert in= 474.30 Invert in= 473.70 Invert in= 472.24 Invert in= 470.! Invert out= 473.70 Invert out= 472.24 Invert out= 470.50 Invert out= 469.! Length (ft.)= 30 Length (ft.)= 86.00 Length (ft.)= 102.00 Length (ft.)= 92.0( n= 0.012 n= 0.012 n= 0.012 n= 0.01; Dia. (inches): 12 Dia. (inches): 12 Dia. (inches)= 12 Dia. (inches)= 12 % Slope= 2 % Slope= 1.70 % Slope= 1.70 %Slope= 1.00 Q Full (cfs)= 5.46 Q Full(cfs)= 5.03 Q Full (cfs)= 5.03 Q Full (cfs)= 3.86 V Full (fps)= 6.95 V Full(fps)= 6.41 V Full(fps)= 6.41 V Full (fps)= 4.91 Flow time(min)= 0.10 Flow time(min)= 0.29 Flow time(min)= 0.28 Flow time(min)= 0.31 Q Design/Q Full= 16.2% Q Design/Q Full= 34.8% Q Design/Q Fuil= 43.9% Q Design/Q Full= 55.8` Page 1 n