만대·가아·자운지구 비점오염 유출특성 분석 및 저감사업 평가

Abstract

Due to muddy water from the highland fields upstream of Soyangho Lake, the Mandae, Gaa, and Jawoon have been redesignated as NPS managementareas. This study aims to evaluate the adequacy and supplementation points of the implementation plan by analyzing the operation status of muddywater generation and reduction facilities through on-site investigations by NPS management area to achieve the effective nonpoint pollution reductiongoal in the implementation of the implementation plan established in 2020. The SS load calculated based on the survey results from July to October2019 from 2017 showed a decreasen in 2019 compared to 2017. Both and the Jawoon were analyzed to have decreased. However, the amount ofprecipitation also decreased by about 27%, so it was judged that the effect of the reduction project was not significant. As a result of the detailedinvestigation of abatement facilities, about 86% of the 793 facilities installed in the management area were evaluated as ‘good’. As a result of a detailedinvestigation by subwatersheds, subwatersheds 105 and 106 in the Mandae were analyzed as apprehensive subwatersheds. appeared to fall. In addition,it was analyzed that the effect of reducing muddy water in the Mandae district was insufficient due to the high ratio of leased farmers, lack of effortsto reduce turbid water in leased farmland, conversion to annual crops, and neglect of bare land. In the case of Gaa district, although the abatementfacilities are concentrated in the upstream, muddy water was also found to be severe.