Hydraulic Analysis of the Impacts of I/I on System Capacity

by Eric D. Loucks, Donohue & Associates Inc, Schaumburg, United States,
Theresa Z. Johnson, Donohue & Associates Inc, Schaumburg, United States,

Document Type: Proceeding Paper

Part of: Environmental Engineering


The USEPA Stormwater Management Model was used to evaluate the impact of infiltration and inflow on the separate sewer facilities of one of the largest sewage treatment districts in the world. Key project tasks included development of I/I hydrographs, hydraulic modeling of storm induced flows in eight sanitary sewer service basins and formulation of alternatives for dealing with excess flow. These alternative approaches were devised to address anticipated treatment capacity shortfalls. An approach based on peak flow storage will result in substantial cost savings relative to the other alternatives investigated. Nonetheless, approximately $400 million in system improvements will ultimately be needed to solve problems created by excess I/I.

Subject Headings: Stormwater management | Hydraulic models | Sewers | Storm sewers | Sewage | Inflow | Infiltration

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