Abstract
A model of the dynamic contributing area during a storm is formulated in terms of the history of precipitation in excess of B horizon permeability. The spatial dynamic contributing area along the main stream is obtained under the assumptions that the velocity of flow along the stream network is uniform, the drainage density is a constant within a given watershed, and the first‐order streams are uniformly distributed in the basin. The runoff from the dynamic contributing area is then routed through the synthesized stream network to obtain the direct runoff at the basin outlet by making use of a method based on the linearized Saint Venant equations. The model has been tested in several watersheds in the central United States.
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