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| Stormwater Solutions at Western Michigan University |
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Posted Date: 8/3/2009
 The purpose of the WMU Lot 23 Stormwater Treatment Project was to divert and treat first-flush stormwater runoff generated from approximately 32 acres of WMU campus via a retrofit of existing infrastructure. The previous storm sewer outfall serving this area of campus was discharging untreated runoff directly into Arcadia Creek (a tributary of the Kalamazoo River). The treatment system storage volume is estimated to be approximately 110,000 cubic feet and is associated with a 1.5-inch, 24-hour rainfall event (approximately a 4 to 6-month return frequency).
This treatment system has been designed to allow routing of excess stormwater flows through the existing WMU outfall infrastructure. Captured/treated first-flush stormwater runoff is slowly released to Arcadia Creek over a 48-hour period following each rainfall event. Some fraction of stormwater is also infiltrated to groundwater. An estimated 7.3 tons of total suspended solids and 32 lbs of phosphorus will be treated annually by this stormwater system.
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