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Catch basins & manholes

How is the bottom elevation of catch basins & manholes identified?
AnswerThis is identified as the INVERT elevation, which is indicated at the bottom of catch basins, manholes as well as drains.

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  1. Unknown4/27/11, 4:25 PM

    Your answer is partially incorrect. Yes, it's the INVERT elevation, but the invert elevation is defined as the elevation of the inside of the lowest pipe as it enters (or exits) a catch basin. The catch basin itself can extend below that, and often does.

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