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City of Ann Arbor SSWWEP - Citizens Advisory Committee Coordination — City of Ann Arbor

1.37 -C- How does household usage effect volumes measured from footing drains?

Posted by Lori Byron on 20 Dec, 2013
Category: Category 1 - SSWWEP Questions and Presentations

Frank Burdick’s Log Number: N/A
Submitted by: Resident, via email
Category (1,2,3): 1
Status: Closed
Estimated date to address: N/A

Q. 1.37 Via e-mail. If you were to measure footing water and household water during a rain event and also during a time of day when the household use is very low, naturally most of the water will be from the footings, even though the amount and rate of flow is low. Thus large percentage numbers could be flashed without qualification.

A. Peak flows during rain events drive the design of sanitary sewer systems, and high peak flow can overload the system and cause basement backups and sanitary sewer overflows (SSOs). One objective of the SSWWEP is to identify alternatives to address basement backups and SSOs. For this reason, it is critically important that we understand the impact of FDDs on peak flows and the volumes generated from rain events. These will be the focus of the FDD evaluation phase of the SSWWEP. 

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