Water quality evaluation and pollution load estimation of ditches around the Yuqiao Reservoir
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Abstract:
The single factor evaluation method and the comprehensive pollution index (CPI) method were employed to evaluate the water quality of 31 ditches around the Yuqiao Resvervoir in 2017. The single factor evaluation results showed that the proportion of Ⅲ and the lower V were 9. 5% and 52.4%, respectively. The main pollution factors were ammonia nitrogen, total phosphorus, and chemical oxygen demand. The comprehensive pollution index results showed that the worst water quality was Yangezhuang ditch with CP1=48. 67 and the best was Yingzhuangzi ditch with CPI= 1. 45, respectively, Based on meteorology date，such as rainfall, hydrological data,topographic information, soil and land use records were collected to simulate the surface runoff of the ditches using SCS-CN method. Furthermore, the pollution load of the main pollutants was estimated after multipl ymghy the concentration of the pollutant. The results indicated that the annual input of chemical oxygen demand was 723. 2 tons,and total nitrogen was 213. 9 tons,while total phosphorus was 11. 4 tons, respectively. The research result would provide scientific evidence for strengthening the water quality safeguarding and non-point source pollution controlling of Yuqiao Reser voir, which moy benefit form reducing the reservoir inflow pollutants and ensuring the drinking water resource safety.
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