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An Analysis of Characteristic Parameters for the Design of Detention Pond in Urbanized Area  

Lee, Jae-Joon (금오공과대학교 토목공학과)
Kim, Ho-Nyun (금오공과대학교 토목공학과)
Kwak, Chang-Jae (금오공과대학교 토목공학과)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.6, no.4, 2006 , pp. 37-47 More about this Journal
Abstract
Urban development results in increased runoff volume and flowrates and shortening in time of concentration, which may cause frequent flooding downstream. Flow retardation structures to limit adverse downstream effects of urban storm runoff are used. There are various types of flow retardation measures include detention basins, retention basins, and infiltration basins. In basic planning phase, a number of planning models of detention ponds which decide storage volume by putting main variables were used to design detention ponds. The characteristics of hydrological parameters $\alpha,\;\gamma$ which are used in planning models of detention pond were analyzed. In this study, detention ponds data of Disaster Impact Assessment report at 22 sites were analyzed in order to investigate correlation between characteristic of urban drainage basin parameter and characteristics of detention pond parameter due to urbanization effects. The results showed that storage volume was influenced by peak discharge ratio $\alpha$ more than runoff coefficient ratio $\beta$ and peak discharge ratio $\alpha$ was influenced by runoff coefficient ratio $\beta$ less than regional parameter n. Storage ratio was mainly influenced by duration of design rainfall in the case of trapezoidal inflow hydrograph such as Donahue et al. method.
Keywords
peak discharge ratio; time of concentration ratio; planning model of detention pond; detention storage; storage ratio;
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