Title
Resolution to Petition the Washtenaw County Water Resources Commissioner to Design and Construct Stormwater Controls in the Allen Creek Drainage District at the E. Stadium Bridges Project to Reduce Downstream Flooding and Improve Water Quality (Total Cost: $1,094,059.40; City’s Apportionment: $1,051,391.08)
Memorandum
Attached for your approval is a resolution to petition the Washtenaw County Water Resources Commissioner (WCWRC) to undertake a project to design and construct stormwater controls in the Allen Creek Drainage District at the E. Stadium Bridges Project.
The E. Stadium Bridges Project spans two different watersheds: Allen Creek (46%) and Malletts Creek (54%). As a result, two separate petitions to the Washtenaw County Water Resources Commissioner are required.
The Allen Creek Initiative identified construction of stormwater control measures within the creekshed as a high priority to control water quantity and improve water quality during storm events. The Allen Creek Initiative was launched in 2007 and is a collaborative effort with the Washtenaw County Water Resources Commissioner, the City of Ann Arbor, Ann Arbor Public Schools and the Allen Creek Advisory Committee. Its goal was to identify, prioritize and select stormwater management projects that would reduce flooding and improve water quality in Allen 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 E. Stadium Bridges Replacement Project is currently sch...
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