Study on Installation Standards of Reduction Facilities considering Flow Condition of Small Drainage

Abstract

While drainage installed in mountainous and urban areas play various roles for supplying and draining water, the standards for reduction facilities and maintenance are insufficient. In the case of small drainage, if there is an inflow of deposited debris, overflow damage occurs due to lack of water supply capacity. In this study, a reduction facility was developed to block the transport of debris in a small drainage. The equation considering installation standards was proposed by analyzing capture efficiency through hydraulic experiment. By establishing various experimental conditions, a total of 900 experiments were conducted using 90 different conditions. The reduction effect of reduction facilities was analyzed by consideration of flow conditions such as discharge and Froude Number. Multiple regression analysis was conducted to develop an equation that considers the installation standard of a small drainage. The dependent variable was capture efficiency, and the independent variables were discharge, Froude Number, and an effective cross sectional area of reduction facilities. The equation considering installation standard of small drainage is E = 1.337-5.074×Q-0.156F_r-132.710A and the significance is high. The results of this study are expected to be applied to reduction facilities suitable for target capture efficiency targeting small drainage.