Development of Web-based Load Duration Curve system for analysis of total maximum daily load and water quality characteristics in a waterbody

• Published in: Journal of environmental management Vol. 97; no. 1; pp. 46 - 55
• Main Authors: Kim, Jonggun, Engel, Bernard A., Park, Youn Shik, Theller, Larry, Chaubey, Indrajeet, Kong, Dong Soo, Lim, Kyoung Jae
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 30.04.2012; Elsevier; Academic Press Ltd
• Subjects: Animal, plant and microbial ecology; Applied ecology; Biological and medical sciences; Computer programmes; Conservation of Natural Resources; Conservation, protection and management of environment and wildlife; Environmental Monitoring; Environmental restoration; Flow Duration Curve; Fundamental and applied biological sciences. Psychology; General aspects; Internet; Load Duration Curve; Management techniques; Measurement; Methodology; Pollutants; Republic of Korea; Software; Total maximum daily load; U.S.A; United States; Water - chemistry; Water management; Water Movements; Water Pollutants, Chemical - analysis; Water pollution; Water quality; Water quality characteristics; Water Supply; Watershed management; United States; Republic of Korea; United States > US; Load Duration Curve; Flow Duration Curve; Total maximum daily load; Water quality characteristics; Load; Water quality; Duration; Environmental management
• DOI: 10.1016/j.jenvman.2011.11.012
• ISSN: 0301-4797

In many states of the US, the total maximum daily load program has been widely developed for watershed water quality restoration and management. However, the total maximum daily load is often represented as an average daily pollutant load based on average long-term flow conditions, and as such, it does not adequately describe the problems they aim to address. Without an adequate characterization of water quality problems, appropriate solutions cannot be identified and implemented. The total maximum daily load approach should consider adequate water quality characterizations based on overall flow conditions rather than on a single flow event such as average daily flow. The Load Duration Curve, which provides opportunities for enhanced pollutant source and best management practice targeting both in the total maximum daily load development and in water quality restoration efforts, has been used for the determination of appropriate total maximum daily load targets. However, at least 30 min to an hour is needed for unskilled people based on our experiences to generate the Load Duration Curve using a desktop-based spreadsheet computer program. Therefore, in this study, the Web-based Load Duration Curve system (https://engineering.purdue.edu/∼ldc/) was developed and applied to a study watershed for an analysis of the total maximum daily load and water quality characteristics in the watershed. This system provides diverse options for Flow Duration Curve and Load Duration Curve analysis of a watershed of interest in a brief time. The Web-based Load Duration Curve system is useful for characterizing the problem according to flow regimes, and for providing a visual representation that enables an easy understanding of the problem and the total maximum daily load targets. In addition, this system will be able to help researchers identify appropriate best management practices within watersheds. ► We developed a Web-based flow/Load-duration tool for TMDL development. ► The tool includes multiple options for entering streamflow and water quality data. ► Various output formats enable users to evaluate flow/pollutant load characteristics. ► Web-based LDC system will help decision-makers select appropriate BMPs.