Urban Stormwater Runoff Control System—Village of Skokie, Illinoisby Eddy H. Nakai,
Robert W. Carr,
Abstract: Combined sewer systems in many communities lack the capacity to convey stormwater runoff from even small to moderate storm. This inadequate capacity, in turn, causes basement flooding a combined sewer overflows. Traditional solutions to these problem are often the separation of the system into storm and sanitary components or the construction of large diameter relief sewers tunnels. Unfortunately, the high costs of these solutions have often deterred the resolution of the combined sewer problems. A runoff control system (RSC) provides a different approach correcting combined sewer flooding problems by adding stormwater detention to the existing combined sewer system. A carefully engineered system of runoff control facilities will limit the rate of stormwater runoff allowed into a combined system to the maximum hydraulic capacity of the combined sewers. The completely urbanized Village of Skokie, Illinois is implementing a RCS program. The system is an optimum combination of on-street storage, detention facilities and relief sewers Nearly half of the required detention storage was accomplished by on-street ponding. Preliminary engineering studies recommended a runoff control system designed for a 10 year recurrence interval storm. The program consists of six components: flow regulators, street berms, storm collector sewers, subsurface stormwater detention tanks, surface detention basins and combined relief sewers. The cost of the recommended systems is approximately one third the cost of a conventional relief sewer system providing similar protection.
Subject Headings: Stormwater management | Runoff | Control systems | Combined sewers | Urban areas | Storm sewers | Floods | Hydraulics | North America | Illinois | United States
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