Exfiltration is a term used by Hydrology Studio indicating flow exits the pond. It can be used interchangeably with infiltration. Exfiltration flows are based on the contour area at each stage or elevation. They are computed using the following equation:

Qex = outflow (cfs)
ER = exfiltration (percolation) rate (in/hr)
SA = contour surface area at a particular stage (sqft)

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