Title
Resolution to Petition the Washtenaw County Drain Commissioner to Design and Construct Stormwater Controls in the Allen Creek Drainage District at the Ann Arbor Farmers Market to Reduce Downstream Flooding and Improve Water Quality and to Appropriate Funds for these Stormwater Management Improvements ($599,600.00 Project Amount; $572,018.00 City Share) (8 Votes Required) (Roll Call Vote Required)
Memorandum
Attached for your approval is a resolution to petition the Washtenaw County Drain Commissioner (WCDC) to undertake a project to design and construct stormwater controls in the Allen Creek Drainage District at the Ann Arbor Farmers Market.
The Allens Creek Initiative identified construction of stormwater control measures at the Ann Arbor Farmers Market as a high priority to control water quantity, improve water quality and increase stormwater awareness within the creekshed during storm events. The Allens Creek Initiative was launched in 2007 and is a collaborative effort with the Washtenaw County Drain Commissioner, the City of Ann Arbor, Ann Arbor Public Schools and the Allens Creek Advisory Committee. Its goal was to identify, prioritize and select stormwater management projects that would reduce flooding and improve water quality in Allens Creek.
Much of Allen Creek is contained in underground piping that carries stormwater runoff from the urban core of Ann Arbor. Nearly 44% of the land draining to the creek is impervious, and as a result, stormwater frequently enters the creek too quickly, causing localized flooding during rain events. These rain events also carry pollutants from impervious areas to the creek, lowering water quality. Allen Creek falls within the Total Maximum Daily Load (TMDL) area of the Huron River. The goal of the TMDL is to remove 50% of the phosphorus and E. coli from storm water.
The Farmers Market currently has no stormwater quantity control measures, so this project will provide needed detention and improve down...
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