Developing a Water Quality Reliability Index Considering Low Impact Development in Urban Areas

Abstract

With the progress in urbanization, the existing pervious areas change into impervious areas. At the same time, this causes various environmental problems such as worsening the water quality and increasing non-point source pollutants due to excessive rainfall. Studies have proposed to supplement the environmental change problem for the development area through Low Impact Development (LID) techniques. This study evaluated the function of reducing non-point source pollution load in the urban basin through the application of various LID facilities. A reliability evaluation technique was conducted to quantitatively assess the problem of water pollution. Two elements with different levels of physical capacity were constructed using the Distance Measure Method to evaluate reliability. Based on Storm Water Management Model 5.1, various scenarios based on probability rainfall were considered in the Sungnae drainage basin. The results revealed the ideal pipe network in Scenario 3. This study included the need to manage the reduction of non-point source pollution in the urban basin through a preliminary review of various scenarios. By quantifying the results of water quality management of individual facilities, it can be used as basic data for setting effective reduction targets and making decisions considering the characteristics of the basin.