[Study on the potential pollution in river section based on PPI]

A new method named river section potential pollution index (R-PPI), which could forecast the influence of the potential pollution in river section was developed and applied in the three typical watersheds in mountainous area in Beijing. Water pollution is one of the most important water environment problems, and the administration needs to clear main polluted river section, area and pollution source. Assessment methods of river water quality based on water quality monitoring is hard to clear main pollution source. Based on potential non-point pollution index (PNPI), 3 important improvements were made including extending land use types, matching land use types and dividing the soil permeability classes and the PPI and R-PPI was developed. The research on the application in three watersheds showed that R-PPI is a simple and comprehensive method. It needs less monitoring data and is easier to find main pollution source, which can offer scientific rule for watershed pollution control.