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Flow, level, and hydraulic concepts

What is flow rate in a sewer?

Published January 29, 2026
A

What is flow rate in a sewer?

Flow rate is the volume of water or wastewater passing a reference point in a specific period of time, typically expressed in liters per second, gallons per minute, or cubic feet per second.​

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When determining sewer basin and sub-basin areas for an I/I analysis, do you typically use the entire acreage of the sub-basin, or do you subtract out undeveloped areas, native growth areas, critical areas, etc. for a better comparison of I/I rates between sub-basins.
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When determining sewer basin and sub-basin areas for an I/I analysis, do you typically use the entire acreage of the sub-basin, or do you subtract out undeveloped areas, native growth areas, critical areas, etc. for a better comparison of I/I rates between sub-basins.

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