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Application of a Decision Support System for Total Maximum Daily Loads  

Lee, Hye-Young (Department of Environmental Science and Engineering College of Engineering, Ewha Womans University)
Park, Seok-Soon (Department of Environmental Science and Engineering College of Engineering, Ewha Womans University)
Publication Information
Journal of Korean Society on Water Environment / v.20, no.2, 2004 , pp. 151-156 More about this Journal
Abstract
A decision support system, Watershed Analysis Risk Management Framework(WARMF), was applied to the Kyungan Stream watershed, a tributary of Lake Paldang, for calculation of total maximum daily loads(TMDL). The WARMF system was developed by Systech Engineering, USA, and has been successfully used in several watersheds, for TMDL studies. The study area was divided into 14 sub-basins, based on digital elevation model(DEM). The integrated watershed and stream model of WARMF was validated by flow and BOD data measured during the year of 1999. There were reasonable agreements between model results and field data, both in water flow and BOD. The validated Kyungan WARMF was extensively utilized to study the quantitative relationship between waste loads and receiving water quality. Based on TMDL guideline at Paldang Lake and Kyungan Stream, the water quality criterion were set to be 3.0mg/L, 3.5mg/L, and 4.0mg/L at the watershed outlet. The allowable waste loads of BOD, both from point and non-point sources, were determined at each water quality criterion. From this study, it was concluded that the WARMF provided several advantages over the conventional application of watershed and stream models for TMDL study, such as time variable simulations, multiple possible soutions, and reduction loads for goal water quality, etc.
Keywords
Total Maximum Daily Loads; Water Quality Model; Decision Support System; Waste Load Allocation; WARMF; Kyoungan Stream;
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