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I am modeling an area that is 100% impervious which is directed to an infiltration bed. The report summary from the catchment area is showing an outflow of 1 cfs and a volume of 1933 cf. The report summary for the infiltration bed shows an inflow of 2.18 cfs and a volume of 4598 cf. There are no...

I am modelling a small project which is producing unexpected results. The flow path consists of a blacktop driveway. Tributary to the flow path is a small area of grass, some roof water, and of course the driveway. Post construction eliminates the grass area and all new impervious and existing...

Peter Thanks for your response and sorry that I haven't been very clear. I have attached the file that I am working on. The PA Stormwater Manual allows for a volume reduction in outflow amount through a wet pond equal to storage volume between the predicted high water level elevation and the...

Pa allows us to subtract the stage volume from the total outflow volume. I don't suppose that there is a way to show that in HydroCAD.

Thanks for the info. I'm not sure what I was doing before, but I was sure that I was getting different outflow numbers if I included the "dead storage" volume. It seems to be giving me accurate numbers now. Thanks Steve

I am modeling a wet pond for stormwater management and am having difficulty in getting the report to show the proper storage volume. Here is the scenario. I have the pond invert at 96.00,a height of 6', a starting elevation of 100.00, a weir at 100.00, and an orifice at 100.50. I have...