Synthetic Design Hyetograph and Rational Runoff Coefficient

by Jong-Song Chien, (A.M.ASCE), Manager; Environmental Engrg., John David Jones and Assocs., Inc., Cuyahoga Falls, Ohio; formerly, Mgr., American Consulting Services, Inc., Minneapolis, Minn.,
Simsek Sarikelle, (M.ASCE), Assoc. Prof. of Civ. Engrg.; Univ. of Akron, Akron, Ohio,


Serial Information: Journal of the Irrigation and Drainage Division, 1976, Vol. 102, Issue 3, Pg. 307-315


Document Type: Journal Paper

Discussion: DaCosta Pedro C.C. (See full record)
Closure: (See full record)

Abstract: A simple method of establishing the synthetic design hyetograph is presented. The method is based on rainfall intensity-duration-frequency curves with simple computation. The method incorporates the rainfall duration, rainfall depth, and the advancing storm patterns. In addition, a method of computing the average runoff coefficient for the Rational Method is developed. This method is predicated on the principle of mass conservation using Horner's field data. Examples are given for the establishment of synthetic design hyetograph and its application to the determination of average runoff coefficient. The methods presented are useful tools for drainage analysis.

Subject Headings: Hydrologic data | Rainfall duration | Runoff | Rainfall intensity | Rainfall frequency | Curvature | Computing in civil engineering | Storms

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