Abstract
A flood runoff model for small urban watersheds with detention basins is proposed. The proposed runoff model is based on the Nash model. The storage coefficients of the Nash model are estimated by the kinematic wave model for rural areas and built-up areas respectively. Outflow from detention basins are calculated by the storage routing method. We applied the present runoff model to two small urban watersheds and obtained good results. And we could estimate the flood control effects of detention basins by comparing the hydrographs calculated by the present runoff model for urban watersheds with and without detention basins respectively.
