Abstract
A lumped runoff model is developed. This model consists of two runoff components, i.e. river flow and subsurface flow in saturated zone. These water movements are represented by the basic differential equations derived from the hydraulic principles, such as the equations of unsteady flow and the Darcys law based on Dupuit-Forchheimer assumption. The identification procedure of the model parameters is presented and the estimation method of runoff hydrograph from the calibrated model is given. The model is applied in the experimental catchment (373.6 km2) of Kanna river basin, Kanto area, Japan. The results show the good agreement between estimated and observed flood flow and low flow hydrographs.
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