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The road is curbed. Your numbers seem to match fairly closely what I got. The a value of 0.112 is the additional drop at the inlet over what the normal curb elevation would be at the inlet face. So the inlet pitch is steeper than the gutter. I was getting depth values of .6 or greater...

Lag is the time between the peak flow and the centroid of rainfall. Lag time defines the shape of your hydrograph when using unit hydrograph methods. The time of concentration is used generally with rational method type analysis. However, when you are routing hydrographs you need to describe...

A coworker and I have been working on a storm drainage project using Haestad Method's StormCAD V.5.0 software. The software is supposed to be based on HEC 22 inlet design principals. However, I have not been able to get the program to produce results which match the procedures in HEC-22. I...

If you are looking at flood proofing the buildings, and the pipe is as undersized as it sounds, I would ignore the flow through the undersized pipe and just calculate surface flow between the buildings. Use HEC-RAS or some other open channel flow software. You can get HEC-RAS off the net for...

Sounds like a Cipoleti weir, but that is sharp crested. Check out an equation developed at the University of Missouri, Rolla, - Wilson, Scott, Wolf. The following equation was developed to model the discharge from a weir like you are describing. Q=0.86H + (3.65w + 5.82z)H^3/2 Where H =...