HydroCad Exfiltration with Wet Ponds

[ftroop82]

I have a wet pond with the WSE of 36.0' and the top of the pond at 42.8', how would you calculate exfiltration with Hydrocad? The GeoTech report has an infiltration rate of 1.8 inches per hour.

 

[psmart]

Just create a pond with an exfiltration outlet.

www.hydrocad.net/exfilt.htm

 

[ftroop82]

I added the exfiltration outlet, but wasn't sure how to input the data. Do I use the only above invert since the pond is wet? Then do I use the surface area or wetted area?

 

[psmart]

If your intent is to hold the pond steady at the wet pond WSE, they yes, you would only allow exfiltration above that elevation. Otherwise the exfiltration will draw-down the initial WSE. It all depends what you're trying to do.

Surface or wetted area depends on the nature of the flow. For details see www.hydrocad.net/exfilt.htm