Estimation of load capture ratio for evaluating LID facilities performance in Korea

Abstract

Accurate performance evaluation is required for efficient design or installation of Low Impact Development (LID) facilities. However, the existing evaluation method in Korea needs to be improved since it has been derived for non-point reduction facilities. The purpose of this study is to propose a new design formula for three types of LID facilities. Through the long-term continuous simulation of EPA SWMM, the Load Capture Ratio (LCR) for LID facilities such as bio-retentions, infiltration trenches, and vegetative swales was estimated. As a result of the sensitivity analysis to verify the newly derived LCR formula, it can be seen that not only the regional rainfall characteristics but also the infiltration capacity of the native soil play an important role in the accuracy of the proposed LCR formula.