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Optimizing Conditions, Capacity, and Asset Health

What is surcharge in a sewer?

Published January 29, 2026
A

What is surcharge in a sewer?

Surcharge occurs when the water level in a gravity sewer rises above the pipe crown, meaning the pipe is running full and pressurized, often during wet weather or downstream restrictions.

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What is an area velocity (AV) sensor?
Published January 29, 2026

What is an area velocity (AV) sensor?

An area‑velocity sensor measures both water depth and velocity at a point in an open channel or sewer, and multiplies the cross‑sectional […]

What is Meant by “Hydraulics at High d/D”?
Published January 29, 2026

What is Meant by “Hydraulics at High d/D”?

• In circular pipes, velocity at partial flow can exceed the full-flow velocity, with maximum velocity typically occurring around d/D ≈ 0.8.• […]

I forgot my password. Can I reset it?
Published January 23, 2026

I forgot my password. Can I reset it?

Yes, in the PRISM login area, enter your User Name and click on ƒ Forgot Passwordƒ . You will be prompted to […]

The specified minimum inter-event time may impact the results of an I/I analysis.?ÿ How big of an impact is there when you vary this parameter?
Published January 23, 2026

The specified minimum inter-event time may impact the results of an I/I analysis.?ÿ How big of an impact is there when you vary this parameter?

The number of discrete rainfall events that you extract from a continuous time series of rainfall data is inversely proportional to the […]

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