Uncertainty of Runoff Volume as a Function of Rainfall and Catchment Characteristics

by Stephen S. Heaney, Old Dominion Univ, Norfolk, United States,
A. Osman Akan, Old Dominion Univ, Norfolk, United States,

Document Type: Proceeding Paper

Part of: Hydraulic Engineering


The expected variability of runoff volume due to the uncertainties in spatial distribution of rainfall and catchment characteristics is quantified. A physically-based mathematical model is employed to express the runoff volume in terms of the mean of the parameters characterizing the rainfall, soil, catchment topography and antecedent moisture conditions. A first order uncertainty analysis is then formulated to determine the standard error of the estimate of the runoff volume from the variations of the parameters characterizing the rainfall and the catchment. A sample application is also included.

Subject Headings: Rainfall-runoff relationships | Runoff | Catchments | Uncertainty principles | Spatial distribution | Soil water | Mathematics | Mathematical models

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