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Hydrocad exfiltration volume

Hydrocad exfiltration volume

Hydrocad exfiltration volume

(OP)

How can I find the total volume leaving a HydroCAD detention pond with outlet discharges that include exfiltration? I have not, so far, been able to find this volume using the numbers reported by HydroCAD. For ponds without exfiltration discharges, I understand that the total volume leaving the pond would be the sum of the incoming runoff volumes.

RE: Hydrocad exfiltration volume

Assuming that you're using the Discarded routing for the exfiltration, you will find the exfiltration peak flow and volume on the "Discarded" line near the top of the pond summary report.

Peter Smart
HydroCAD Software
www.hydrocad.net

RE: Hydrocad exfiltration volume

(OP)
Thank you Peter. The pond outflows volumes seem to depend on the length of the time span, and if the time span is long enough, the pond inflow and outflow volumes match closely. Is that correct?

RE: Hydrocad exfiltration volume

The reported volumes are calculated over the specified calculation time span. If you want to include the complete outflow volume then you will need to extend the time span accordingly (until the outflow goes to zero)

Peter Smart
HydroCAD Software
www.hydrocad.net

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