Economic Impacts of Storm Sewer Design Criteria

by Susan G. Mattinson, Lockwood, Andrews & Newnam Inc, United States,

Document Type: Proceeding Paper

Part of: National Water Conference


This paper discusses the selection of storm sewer design criteria and the resulting economic impacts. Using the Rational Method for calculating design flows, an investigation was made of the cost differential for a storm sewer system designed to serve a 78 acre mixed use development for various rainfall design frequencies and downstream tailwater conditions. This cost differential was then projected for a 460 acre development to determine the effects on local tax rates. As expected, there is a tangible cost difference associated with the various design condition. An extreme event analysis was also completed in order to determine sheet flow patterns occuring during the less frequent (100-year) rainfall event. Additional study results are discussed.

Subject Headings: Economic factors | Storm sewers | Sheet flow | Rain water | Drainage systems | Rivers and streams | Taxation | Environmental issues

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