Growth in the Economic and Hydraulic Engineering Capacities Drives Water Quality Improvement in the Eastern Region of Nansi Lake, China

Knowledge of the extent water pollution along a diversion channel is essential for ensuring security and effectiveness projects. Thus, identifying trends in quality factors which influence diverted river prerequisite to safety diversion. As an important control unit Eastern Route South North Water Diversion Project, hilly eastern region Nansi Lake Basin (ENLB) suffers excess transferred into during flood season. The comprehensive index (CPI), Mann-Kendall trend test analysis variances were used characterize spatiotemporal variation three main mountainous rivers ENLB. contribution different influencing parameters may be explained using ridge regression analysis. results showed that CPI major decreased significantly from 2000 2012. had problems compliance, this was most noticeable Guangfu River. pollutants exceeding standards chemical oxygen demand total phosphorus. GDP per capita largest factor influenced changes regional quality, with average being 30%. An increase storage capacity shown have positive effect on improving quality. provided scientific basis establishing strategy would give support planning future