《Table 1 China’s environmental quality standards for surface water (GB 3838–2002) (mg/L)》

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《Evaluation of Farmland Drainage Water Quality by Fuzzy–Gray Combination Method》

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Due to the anomalies of the summer climate in 2013，the rainfall level was much less than usual.Low rainfall produces no runoff，which resulted in no apparent significant runoff for this study.As such，we selected three relatively large rainfalls as our study period from which to takesamples（June 25，July 31，and August 26 in 2013，with moderate rain and above）.We tracked and monitored the concentrations and transport of N and P during the rainfall periods in the drainage ditches within the study area.As shown in Fig.3，points 1–9 indicate sampling points along the study ditch，of which point 9 is a ditch estuary and point 10 is a farmland estuary.We used the following water-quality indicators:dissolved oxygen（DO），chemical oxygen demand（COD Cr），total nitrogen（TN），ammonia nitrogen（AN），and total phosphorus（TP）.We used Chinese national standard methods to monitor these indicators.Figure 4 shows plots of the monitored indicator data.For our evaluation criteria，we used China’s Environmental Quality Standards for Surface Water（GB 3838–2002）（Table 1） .