Abstract
The rising and recession limbs of conceptual dimensionless overland flow hydrographs are calculated for specific values of the rating exponent in the range 1 ≤ m ≤ 3, including a linear reservoir ( m = 1); 100% turbulent Chezy friction ( m = 3 2 ); 100% turbulent Manning friction ( m = 5 3 ); 67% turbulent Chezy (or 75% turbulent Manning) ( m = 2); and 100% laminar flow ( m = 3). These conceptual overland flow hydrographs show finite amounts of diffusion, increasing with decreasing rating exponent, unlike the kinematic wave hydrograph, which is nondiffusive.
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