Abstract
Urbanization changes the runoff process artificially, and flood disaster tends to occur frequently even by a small rainfall. Neya River Basin, the low plain of Osaka Prefecture, is one of the areas where the rapid urbanization has been advanced. The local government has proceeded with the plan practically to prevent the basin from flood disaster due to three strategies; drainage works, storage works, and infiltration function. However, even if this project would be completed by planning age around 2010, the control agrees just in 40 years of the return period.This paper firstly discusses the efficiency and availability of the main water facilities for flood control by the model rainfall, especially focusing on the time-depend characteristics of water storage and cut-off effect of peak flood discharge. Then the possibility of practical control concerning flood control and water reuse is studied in order to get the higher stage of water environment expecting the safety and amenity simultaneously in the middle of 21 Century.
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