Staged Reconstruction Of A Major Interceptor Without Service Interruption

Rehabilitation Of The Oakland Macomb Interceptor Drain
By Harry Price, Fritz Klingler and Mike McMahon | November 2012, Vol. 67, No. 11
Shaft Number 6, north side of flume installed

System history
Built in the 1970s, the Oakland Macomb Interceptor Drain (OMID) is composed of approximately 20 miles of interceptor sewer ranging up to 12.75 feet in diameter, serving over 880,000 people residing in southern Macomb and Oakland Counties, MI. The OMID begins from near 23 Mile Road and Dequindre Road in eastern Oakland County and extends south to the Detroit Water and Sewerage Department’s Northeast Sewage Pumping Station located near 8 Mile Road and Hoover in Detroit. The interceptor carries mostly sanitary flow from local sewers, as well as from the 11-foot diameter Romeo Arm Interceptor that feeds flow from the Macomb County Interceptor System into the OMID. Dry weather flows are typically about 120 cfs, with wet weather flows over 400 cfs at the downstream terminus. The interceptor is non-redundant; therefore flow cannot be diverted and service to the communities must be maintained at all times.

The interceptor ranges in depth from approximately 30 feet to over 100 feet and is constructed through various soil conditions including clay, silt and sand. The northern portion of the alignment is within a nature area which is difficult to access due to flooding, wetlands and areas of environmental concerns. The middle portion of the sewer is within road rights-of-way, and the southern portion is within the International Transmission Company (ITC) high voltage electrical corridor and series of private easements.