S-Hydrographs and Change of Unit Hydrograph Duration

by George W. Tauxe, (A.M.ASCE),

Serial Information: Journal of the Hydraulics Division, 1978, Vol. 104, Issue 3, Pg. 439-444

Document Type: Journal Paper


The S-Hydrograph or S-curve is the hydrograph corresponding to a uniform rainfall of infinite duration. It is used as an intermediate hydrograph in unit hydrography theory to derive from a specified unit hydrograph of a given duration other unit hydrographs of different durations. One common problem in this unit hydrograph derivation is the fluctuation of both the S-hydrograph and the later portion of derived unit hydrographs. A new approach, the Forward-Backward-S-Curve, which minimizes this fluctuation problem, is described.

Subject Headings: Hydrographs | Rainfall duration

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