RAIN-RUNOFF ANALYSIS OF THE ZENPUKUJI RIVER IN URBAN AREA FOR RIVER RECREATION

Abstract

 A storage function model estimated flood discharge due to storm rainfall for river recreation in small river. Rain-runoff of small river in urban area is affected by the outflow characteristics of the combined sewer system greatly. The model which for urban flood considers outflow characteristics of the combined sewer system, is applied to the river catchment of the Zenpukuji River in Tokyo, the typical urbanized area, against 10 stormrainfall events. Time of feasible safe evacuation is obtained by the runoff analysis result. Also, the change of runoff characteristics by storage facilities to hold the initial rainwater is investigated.