Nonpoint source pollution (NPSP) generally occurs: over a large area, over an intermittent period of
time, from diverse sources, sporadically, and is often correlated with climatic events. Geographic
Information System (GIS) is an advanced spatial-tool, commonly applied to the study of NPSP with high
research significance and practical value. Integration of Blackland GRASS GIS and NPSP models on West
Lake watershed was the main focu...