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Exfiltration Discharge Multiplier

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moment_of_inertia

moment_of_inertia

Civil/Environmental
Feb 19, 2021
1
I have a pond with 2 chambers of equal dimensions. I specified the dimensions of a single chamber and applied a storage multiplier of 2.

When using exfiltration, should I also apply a discharge multiplier of 2? Or will the software calculate exfiltration using the already-multiplied chamber dimensions?

Thanks!
 
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If you are using an exfiltration velocity, then the exfiltration will be applied to the entire doubled area, and you should leave the exfiltration multiplier at 1.

But if you are entering the exfiltration flow directly in CFS, then you do need to double the flow for two chambers.

HOWEVER, I recommend that you use the chamber wizard for these designs, which completely avoids this issue.

Peter Smart
HydroCAD Software
 
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