SUSTAIN을 이용한 도시배수분구 LID 시설 최적설치방안 연구

Abstract

Watershed and stormwater managers need modeling tools to evaluate alternative plans for water quality management and flow abatement techniques in urban and developing area. Government and local watershed planning agencies demand a watershed-scale, decision-support framework based on cost optimization to coordinate watershed-scale investments to achieve necessary improvement in water quality. The U.S. Environmental Protection Agency(EPA) has been working since 2003 to develop such a decision-support system. The resulting modeling framework is called the System for Urban Stormwater Treatment and Analysis INtegration(SUSTAIN). SUSTAIN provides evaluating, selecting, and placing LID(Low Impact Development) facilities in an urban watershed based on user-defined cost and effectiveness criteria. This paper estimates LID facility scale and number of units in oncheoncheon watershed to evaluate applicability of SUSTAIN. Required data to drive the model reflects the domestic situation, estimated the optimal scale and quantities of LIC facility using cost - effectiveness curve derived from an optimization process. Applied estimations calculates geoje urban drainage catchment, TP load reduction to be 20% costing about 1.1 billion Korean Won. Outlook of LID installation for optimal effectiveness can be bright if observational data is applied in a calibration and verification.