ABSTRACT
ABSTRACT: Extracting aqueous and dividing watersheds for Xichong River (Xichong County) and studying the contribution of the township pollution as well as delineating heavily contaminated areas. This study is based on GIS and integrates standard load method, output coefficient model and source strength coefficient method, etc. Urban sewage, rural sewage and fertilizer pollution of residents in the area are major sources of pollution point source pollution, which is up to 87% the proportion while the most polluted town is Jin town. Using GIS spatial analysis capabilities to directly reflect the spatial variation of nonpoint source pollution in the township to provide guidance for the subsequent direction of pollution.
