This study aims to develop a quantitative model for calculating the long-term run off loads in reservoir watersheds. By employing geologically based information rather than administrative-district based information and integrating more diverse variables like socio-economic, technological, and natural ones, a more comprehensive model (BlongRM) is developed. The major structure of the model BlongRM consists of a pollutant load calculating stage for each administrative district in which original pollution is generated and washed off, a pollutants load calculation stage for each watershed, and a runoff load calculation stage based on the linear contribution rate matrix. The applicability of the model to practical problem-solving has improved and its usefulness is verified by empirical data. This model will hopely contribute to the development of a lake pollution prevention strategy.

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