A personal computer based easy of access software to help water authorities for setting basin-wide comprehensive management program on water quality control was developed. Users are requested to input geological and administrative mapping of pollution sources and related socioeconomic information such as unit loading, activities, wastewater treatment efficiencies supported by the advisory system. Then the system enables to estimate pollution loads from the basin including both point and non-point sources and to predict quality of the water bodies, i.e. river systems and lakes, based on the present load and expected loads after alternative management plans are implemented. The C-language was used for system development. Lake Sagami-ko and its tributary, Katsura River, was used as a model basin for system development and validation.

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