5feaf3 storm water inlet design gutter inlets si units
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Storm Water Inlet Design - Gutter Inlet - S.S. units
1. Orifice Equation (submerged inlet)
Inputs Calculations
Design Storm Water 0.15 m
0.16
0.30 m
300 mm
Width of Curb
150 mm 0.46 m
0.67
2. Weir Equation (unsubmerged inlet)
Inputs Calculations
Design Storm Water 0.075 m
0.034
0.23 m
75 mm
Width of Curb
230 mm 0.8 m
1.27
Depth of Storm Water, d =
Flow Rate, Q = m3/s
Width of opening, W =
Width of opening, W =
Depth of Storm Water, d = Opening, L =
Orifice Coeff., Co =
Depth of Storm Water, d =
Flow Rate, Q = m3/s
Width of opening, W =
Depth of Storm Water, d =
Width of opening, W = Opening, L =
Orifice Coeff., Cw =
Equation for Gutter Inlet Design using the Orifice Equation
Where: Q = design storm water flow rate through inlet, cfs
W = width of the gutter opening, ft
d = depth of storm water over the gutter opening, ft
L = length of the gutter opening, ft
Equation for Curb Inlet Design using the Weir Equation
Where: Q, L, W and d are as defined above
Q = Co (W L) ( 2g d )1/2 { L = Q/[CoW(2gd)1/2] }
g = 32.2 ft/sec2
Co = orifice coefficient, dimensionless ( typically Co = 0.67 )
Q = Cw (L + 2W) d1.5 [ L = Q/(Cwd1.5) - 2W ]
Cw = wier coefficient, dimensionless ( typically Cw = 1.27 )