58d6d3 storm water inlet design curb inlets us units
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Storm Water Inlet Design - Curb Inlet - U.S. units
1. Orifice Equation
Inputs Calculations
Design Storm Water 0.333 ft
3.4 cfs
0.500 ft
4 in
Storm Water Depth above
6 in 0.3333 ft
0.67 Width of Curb
3.3 ft
2. Weir Equation
Inputs Calculations
Design Storm Water 0.333 ft
1.6 cfs
Width of Curb
4 in 3.6 ft
2.3
Height of Curb Opening, h =
Flow Rate, Q =
Depth of Storm Water, d =
Height of Curb Opening, h =
Depth of Storm Water, d = Orifice Centroid, de =
Orifice Coeff., Co =
Opening, L =
Depth of Storm Water, d =
Flow Rate, Q =
Depth of Storm Water, d = Opening, L =
Orifice Coeff., Cw =
Equations for Curb Inlet Design using the Orifice Equation
Where: Q = design storm water flow rate through inlet, cfs
h = height of the curb opening, ft
d = depth of storm water at curb opening, ft
L = width of the curb opening, ft
Equation for Curb Inlet Design using the Weir Equation
Where: Q, L, and d are as defined above
Q = Co h L ( 2g de )1/2 { L = Q/[Coh(2gde)1/2] }
de = d - h/2
g = 32.2 ft/sec2
Co = orifice coefficient, dimensionless ( typically Co = 0.67 )
Q = Cw L d1.5 [ L = Q/(Cwd1.5) ]
Cw = wier coefficient, dimensionless ( typically Cw = 2.3 )