Storm Drainage Practices of Thirty-Two Cities

by Colby V. Ardis,
Kenneth J. Dueker,
Arno T. Lenz,

Serial Information: Journal of the Hydraulics Division, 1969, Vol. 95, Issue 1, Pg. 383-408

Document Type: Journal Paper

Discussion: (See full record)

Abstract: Wisconsin cities with populations of 7,500 to over 60,000 are rapidly developing comprehensive plans independent of community size with all storm sewer designs done by registered professional engineers. Storms with 5 to 10 year frequency are used in design. Two-foot inlets depressed one in., 12-in. minimum pipe size and pipe velocities of 2 to 15 fps are common. Storm water pollution is recognized but only 1/3 of cities have ideas on its alleviation. Urban drainage designers who provided current practice, policy, procedure, and cost information for a typical 15-acre, 6-block area indicated wide diversity in results when using the Rational Method to compute flows. Only six of twenty-three cities which contributed sample designs used variable intensities correctly in the Rational Method. Errors in the use of the runoff coefficient C was common. The resulting designs gave flows of 68 to 100 cfs at outlet; total project costs which varied from $8,000 to $65,000 for this sample area. The need for narrower guide lines for design is suggested.

Subject Headings: Urban areas | Hydraulic structures | Storms | Stormwater management | Water pollution | Pipelines | Storm sewers | Professional development | Population projection | Wisconsin | North America | United States

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