Submitted by Peter Narsavage on Sun, 03/29/2009 - 2:26pm
Combined Sewer Overflow Pipeline Storage, 1991
Owner: Toledo, Ohio, Division of Water Reclamation Location: Toledo, Lucas County
Nominated by: Steven Wordelman, Jones & Henry Engineers, Inc.
Description: Abatement of sewage overflows from Toledo's combine sewers was accomplished with a system of underground storage tunnels. The project consists of three segments totaling 19,000 lf of 13.5 foot diameter tunnels with a storage capacity of 19.5 million gallons. The downtown segment, about 5,400 lf in length, is the recipient of the 1991 Award. The system captures and stores the overflow from combine sewers during storm events. When capacity is again available in the normal interceptor system, the sewage discharge is returned to the system by three sump pumps. The fully completed system will capture 50% to 80% of the City's combine sewer overflow substantially reducing the pollution discharge to the receiving streams. Technical challenges including pressure surges, odors, sludge accumulation, and wave action in the tunnels had to be solved by the designers.
