Author(s)

M. Kudo, M. Fujita & G. Tanaka

Abstract

To describe runoff precisely, we have no choice but to use a distributed parameter model. Subdividing a whole basin into many sub-basins, the distributed runoff model estimates the runoff in the whole basin by summing the runoff from all the sub-basins. Because of a long computation time, using the distributed parameter runoff model to estimate runoff of sub-basins is not a good idea We obtained the storage function runoff model, a lumped parameter model, from the distributed parameter model by lumping. Storage coefficients can be expressed by using the area, the slope and the geological characteristics of sub-basins. When we consider many sub-basins, we can define the storage coefficient as a random variable distributed around the mean

Keywords