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Thanks for your help. I believe I'm getting closer to understanding and modeling this field correctly. The field is surrounded by concrete curbing in order to anchor the turf, so it should act like a stand alone pond and I understand your direction for selecting pond outlets and control...

Thanks psmart. I agree that CN should be 98, because these fields drain so fast vertically that I have never seen them sheet flow (even in some real downpours). The problem I have is picking (and justifying) a Tc value. My assumption is that I need a way to calculate the the Tc for the water...

What is the proper way to model a synthetic turf sports field using HydroCAD? A typical field design consists of a 2" sand/rubber infill turf layer, then 8" stone base layer with flat panel drains (spaced every 20-ft) located on the bottom of the base layer. The flat panel drains then...

Thanks TerryScan Yes..I guess my question was more of a CN value question. We are not taking credit for infiltration, as the dry basin is for attenuation of peak flows only. I will treat the dry basin bottom as impervious for my model.

We are working on a project with a wet basin and a detention basin. They are not connected and are at different design points. With the wet pond model, I have the permanent pool area as impervious area. If the detention basin drains dry, do I model the bottom area of the basin also as...

Thanks BDAnderson... I thought of that, but modeling the culvert as a reach does not take into acount the entrance losses (k value) from the culvert's entrance headwall. What if I model the upgradient stream as a reach, then model the culvert as a pond with no storage and with the outlet...

I have to design a 400ft long box culvert. We have a stream that will transition into the box culvert as it travels under pavement and then transitions back into a stream. How do I properly model this in HydroCAD or PondPack?