Rainfall Effect on Sheet Flow over Smooth Surface

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Abstract
The variation of friction factor for different flows and rainfall conditions is established by statistical analysis. Boundary shear stress was directly measured by hot-film anemometry. The friction factor is found to be a function of both the flow Reynolds number, R, and the rainfall intensity, I, for a flow Reynolds number of less than 900. For a flow Reynolds number greater than 2,000, the friction factor is only a function of Reynolds number. A numerical model and a simplified procedure to predict the water surface profiles and boundary shear stresses for sheet flow with rainfall are presented. The computations of flow depths and boundary shear stresses are not too sensitive to the effect of uncertainties in selecting friction factor.

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