American Society of Civil Engineers


Hydraulic Design for Combined Sewer Diversion


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

Journal of the Hydraulics Division
, Vol. 104, No. 5, May 1978, pp. 595-606

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Document type: Journal Paper
Abstract: 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.


ASCE Subject Headings:
Combined sewers
Urban development
Flood plains
Hydraulics
Flow distribution