Mechanism of Rural Domestic Pollution Flowing Into Rivers in Plain River Network Area

A questionnaire about rural domestic non-point source pollution was designed and used during the investigation of 85 natural villages in Qianhuang and Xueyan Towns of th Taige Canal Watershed by means of random sampling.Througy statistic analysis of the feedback in the questionnaires,information about ratio of different types of toilets,and fate of the supernatant and solid residue in the septic-tank,and disposal of domestic waste were obtained and summarized.Based on the classification of rural domestic pollutions,coefficients of the pollution flowing into the river were estimated as follows:COD_Cr,6.6%-13. 3%;TN,18. 1%-18.6%;and TP,8.2%-12.5%.