Author(s): Y. Jia; G. Ni; T. Kinouchi; J. Yoshitani; Y. Kawahara; T. Suetsugi
Linked Author(s):
Keywords: Hydrological cycle; Urbanization; Ebi river; Distributed model; Storm-water detention pond; Infiltration trench
Abstract: A distributed hydrological model-WEP (Water and Energy transfer Process) model is improved at first by adding components of overland flow routing and storm-water detention pond simulation. The modified model is then utilized to assess the flood-reduction effects of storm-water detention ponds and infiltration trenches in the Ebi river watershed (27 km`2). Adopting a design storm hyetograph of a central-concentrated shape, 4 cases, namely, with ponds, with trenches, with ponds and trenches, and without ponds and trenches are studied at 6 sites over the watershed. Through comparing the discharge hydrographs at the 6 sites in the 4 cases, it is found that the storm-water detention ponds play much bigger roles than infiltration trenches in reducing flood peaks in upstream reaches, whereas infiltration trenches distributed over the watershed play dominant roles in downstream reaches. The joint installations of storm-water detention ponds and infiltration trenches are thought to be effective for flood damage mitigation in the whole watershed.
Year: 2001