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What is the purpose of the "weir end coefficient" when using atrapezoidal weir for a control structure in SewerGEMS/Civilstorm?
The weir end coefficient is the discharge coefficient for flow throughthe triangular ends of the trapezoidal weir. The other weir coefficientis the discharge coefficient for flow through the central portion of theweir (for flow in CFS for US units). Typical values are: 3.33 US forsharp crested transverse weirs, 2.5 - 3.3 US for broad crestedrectangular weirs, 2.4 - 2.8 US for V-notch (triangular) weirs