GENERALIZED CONCEPTUAL MODELING OF DIMENSIONLESS OVERLAND-FLOW HYDROGRAPHS

The rising and recession limbs of conceptual dimensionless overland fl ow hydrographs are calculated for specific values of the rating expone nt in the range 1 less than or equal to m less than or equal to 3, inc luding 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 (in = 3). The se conceptual overland Bow hydrographs show finite amounts of diffusio n, increasing with decreasing rating exponent, unlike the kinematic wa ve hydrograph, which is nondiffusive. (C) 1997 Elsevier Science B.V.