ABSTRACT
In recent years, the nonpoint source pollution caused by storm runoff from watersheds has become one of the most important environmental protection issues. Past experience indicates that the water quantity and quality in a watershed must be considered simultaneously for effective prevention and control of flooding and nonpoint source pollution. This chapter presents the theoretical basis and application of the IUH model for watershed hydrologic analysis. This chapter also introduces the BASINS model developed by the USEPA as an analytical tool in nonpoint source pollution control. The conjunctive application of BASINS and PLOAD model is illustrated by a case study of Waiawa Watershed on Oahu, Hawaii, and the conjunctive application of BASINS and HSPF models is illustrated by a case study of Manoa-Palolo Watershed on Oahu, Hawaii.
