1605 SE EVERETT MALL WAY WALMART 2018-01-01 MF Import

�• Seattle,Washington �•JJ = = m www. n .com "�, T 2063pacl22.a9510 TURNING VISIONS INTO REALITY Manning's Formula Pipe Flow Calculation Please find below a sample calculation showing the pipe capacity of an example pipe. The body of the stormwater site plan contains a detailed breakdown of the Manning's Equation. Diameter of pipe(inches) 12 Inches Hydraulic Radius: 95% Full Flow = 0.286 % Full Flow(see chart) 95 % 75% Full Flow = 0.302 50% Full Flow = 0.250 Slope of Pipe(percent) 0.5 % 25% Full Flow = 0.147 Manning's Coefficient 0.012 Area in Flow: 95%full-flow = 0.771 = Hydraulic Radius 0.286 75%full-flow = 0.632 50%full-flow = 0.393 Area in Flow 0.771 SF 25%full-flow = 0.154 Flow 2.9401 CFS Velocity 3.81 FPS Diameter of pipe(inches) 18 Inches Hydraulic Radius: 95%Full Flow = 0.430 Full Flow(see chart) 95 % 75%Full Flow = 0.453 50% Full Flow = 0.375 Slope of Pipe(percent) 0.5 % 25% Full Flow = 0.220 Manning's Coefficient 0.012 Area in Flow: 95% full-flow = 1.734 Hydraulic Radius 0.430 75%full-flow = 1.422 50%full-flow = 0.884 Area in Flow 1.734 SF 25% full-flow = 0.345 Flow 8.6683 CFS Velocity 5.00 FPS Diameter of pipe(inches) 24 Inches Hydraulic Radius: 95% Full Flow = 0.573 Full Flow(see chart) 95 % 75% Full Flow = 0.603 50%Full Flow = 0.500 Slope of Pipe(percent) 0.5 % 25% Full Flow = 0.293 Manning's Coefficient 0.012 Area in Flow: 95%full-flow = 3.083 Hydraulic Radius 0.573 75%full-flow = 2.527 50%full-flow = 1.571 Area in Flow 3.083 SF 25%full-flow = 0.614 Flow 18.6683 CFS Velocity 6.06 FPS Everett Mall Plaza Parcel III Retail Expansion Stormwater Site Plan Page 40