Title
Resolution to Petition the Washtenaw County Water Resources Commissioner to Design and Construct Stormwater Controls in the Malletts Creek Drainage District at the E. Stadium Bridges Project to Reduce Downstream Flooding and Improve Water Quality (Total Cost: $1,284,330.60; City’s Apportionment: $1,188,005.81)
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 Malletts 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 Malletts Creek Restoration Project (2000) and the Malletts Creek Management Plan (2007) both identify construction of stormwater control measures within the creekshed as a high priority to control water quantity and improve water quality within the creekshed during storm events. Both of these endeavors were a collaborative effort with the Washtenaw County Water Resources Commissioner, the City of Ann Arbor, the Malletts Creek Association, the University of Michigan, Ann Arbor Public Schools and the Malletts Creek Coordinating Committee. Goals included the identification, prioritization and selection of stormwater management projects that would reduce flooding and improve water quality in Malletts Creek.
Much of Malletts Creek is contained in underground piping that carries stormwater runoff from the urban core of Ann Arbor. Nearly 37% 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. Malletts Creek falls within the Total Maximum Daily Load (TMDL) area of t...
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