Good evening. I am doing a dam breach analysis on a small earthen berm farm pond. Very shallow and very old with a long shallow approach to the weir. The regulator is asking that I model a sunny day breach (as would be typical) by piping failure. I have modeled the breach using 150% of the 100 year rainfall event in HydroCAD and the results is a class A hazard dam. Despite this the regulator still wants to see the sunny day model with piping. Given the scope of the project I would rather not model it with HEC software as I am not really familiar with it. I am competent in HydroCAD. I'm hoping that someone can point in the direction of a method for modeling a piping failure. Thanks!
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