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Storm/Flood Engineering

Storm/Flood Engineering

Storm/Flood Engineering

(OP)
I have been asked to calculate the 100-year headwater pool elevation at a parking lot sag inlet.  Does anyone have any tips?

RE: Storm/Flood Engineering

Use HEC12 Chart 11, choose which flow is present.
For weir flow, depth = [Qt/(Cw*P)]^(2/3), ft
P=perimeter of grate, I use 3.0 for Cw
For orifice flow, depth = [Qt/(Co*A*2g)]^(1/0.5), ft
A=effective flow area of grate, I use 0.67 for Co

RE: Storm/Flood Engineering

lha is correct.  If you go to the fhwa web site you can download visual urban which is a program that calculates this type of headwater and has a decent print out for the results.

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