Wastewater Inflow Calculator
Drainage Area, in Square Feet:
Rainfall Amount, in inches:
Estimated added inflow into
sewer from rainfall, in Gallons:

Inflow Calculator is a approximate calculation based on a scenario of a sewer drain/cleanout receiving rainwater from a non-porus surface such as a building roof or saturated yard. Measure approximate square footage which drains to a sewer pipe and input approximate rainfall event.

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