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Temporary Detention Cuts Storm Flow Peaks

by Ayoub Talhami, (M.ASCE), Supervising Engr. of Local Sewer Systems; Metropolitan Sanitary District of Greater Chicago, Chicago, Ill.,


Serial Information: Civil Engineering—ASCE, 1980, Vol. 50, Issue 12, Pg. 72-75


Document Type: Feature article

Abstract:

In the Chicago area, ordinances require that the storm water runoff rate of a site after development be no more than it was before site development. This is because urbanization is often accompanied by an increase of two to five times in the quantity of runoff and as much as ten times in the rate of runoff. To avoid flooding, storm water detention facilities are incorporated in the design of new developments. The article explains the need for such facilities and details the various methods used including basins, lakes, parking lots, underground structures, roof storage, crushed stone beds, and surface storage. All the methods require that the outlet pipe from the facility be smaller than the inlet pipe. Various methods used to reduce outlet size are discussed.

Subject Headings: Stormwater management | Runoff | Water storage | Underground structures | Underground storage | Spillways | Parking facilities

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