Ann Arbor Area Civic Document Repository

ANN ARBOR, Mich., June 28, 2013 — On Thursday, June 27, 2013, the Ann Arbor area was deluged with intense rainfall that caused flooding conditions and significantly increased the flow of wastewater to the City of Ann Arbor Wastewater Treatment Plant (WWTP) over a short period of time. Plant flows more than tripled within a half hour. As a result of this unprecedented increase in plant flow, approximately 10,000 gallons of untreated wastewater was discharged to the Huron River from 5:20 to 5:30 p.m. By comparison, the WWTP fully treated approximately 350,000 gallons of wastewater during the 10­minute period over which this incident occurred.