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

1.25 -C– Why only a 6 month flow monitoring period? Winter is very unpredictable regarding rainfall.

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

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


Q. 1.25 Why only a 6 month flow monitoring period? Winter is very unpredictable regarding rainfall.

A. The wetness conditions of the soils vary significantly from spring to summer, and monitoring from March through August is typically adequate to measure the impact that this variation has on wet weather flows in the sanitary sewer system. We also have a long period of record at the WWTP (over 10 years) to assess long-term system performance. Winter events are not usually used in the analysis because there are enough other events during the six-month period to accurately quantify the flows.

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