Hydraulic Design for Combined Sewer Diversion

by Bruce J. Pennino, (A.M.ASCE), Research Engr.; Alden Research Lab., Worcester Polytechnic Inst., Holden, Mass.,
Richard A. Perkins, Part.; Taylor & Perkins Engrg., Inc., Russellville, Ark.; formerly, Project Mgr., Hayes, Seay, Mattern & Mattern, Roanoke, Va.,

Serial Information: Journal of the Hydraulics Division, 1978, Vol. 104, Issue 5, Pg. 595-606

Document Type: Journal Paper


The City of Richmond is building two diversion structures that will join two existing sewers to a retention basin where combined sewage and storm runoff will be stored for later treatment. This scheme will minimize the discharge of combined sewage to the James River. Levels in the sewers and diversion structures vary with flow, river level, and interaction between the connected diversion structures. In order to accurately predict and minimize levels in the sewers upstream of the diversion structures, a 1:18 hydraulic model was tested. The model showed that levels could be reduced in both the flow to the river mode and diversion mode by streamlining various elements of the diversion structures. A flow distribution device reduced unacceptably high velocities at the trash screens.

Subject Headings: Hydraulic design | Hydraulic models | Combined sewers | Retention basins | Sewage | Rivers and streams | River flow | Model accuracy

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