Can applicants or their agents use their own flow determination?
Yes, the flows must be either computed or approved by the DEQ’s Hydrologic Studies Unit (HSU) for streams/drains with a drainage area of 2 square miles or more. If the applicant or their agent computes their own flow values for a project we will ask the HSU to verify and approve the flow values. The computed flows must conform to HSU approved methodologies. A project with a drainage area less than 2 square miles is exempt under Part 31 and the HSU will not compute a flood discharge. If the applicant needs a design discharge they can go to the web address at www.michigan.gov/deqwatermanagement, click on Hydrologic Data Collection & Analysis, click on Computing Flood Discharge for Small Ungaged Watersheds, for a calculation spreadsheet. For the watershed with a time concentration less than 1 hour, TR-55 method is recommended.
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- Can applicants or their agents use their own flow determination?
