INVESTIGATION OF RUNOFF CHARACTERISTICS OF URBAN SMALL WATERSHEDS USING RAGULATION PONDS IN NAGOYA CITY

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  • 名古屋市小規模ため池を用いた市街地小流域の流出特性の検討

Abstract

<p> In urban and urbanized areas, it is important to understand the actual status of runoff. In this study, water level-flow curves were developed for regulation ponds in Nagoya City, and field observations were conducted at flood discharges of regulation ponds to determine the runoff volume from the reservoir water level data. The runoff and inflow rates of the reservoirs were calculated using the water level data of the reservoirs in actual rainfall events to evaluate rainwater runoff in the regulation ponds and urbanized watersheds, and to understand the regulation pond storage effects and runoff characteristics in the regulation pond watersheds. As a result, we confirmed the difference in the storage effect of the two regulation ponds and the runoff characteristics of the reservoir watersheds, as well as the quick rainfall-runoff response due to the biased spatio-temporal distribution of rainfall even in small watersheds.</p>

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