| According to the research on the change trend of water quality from 2001 to 2012 in Chengdu, the proportion of class Ⅰ～Ⅲ water quality was steady between 61.5%～71.8% in recent years，which is better than the results during the Tenth Five Year Plan period,that is only 35.5%. The proportion of inferior class Ⅴ water of Minjiang river was raised dramatically from 4.5% to 33.3% during the Eleventh Five Year Plan period. It found the deterioration of water quality situation very worrying. A centralized source of drinking water station in Dujiangyan, the water quality continuously reduced from class Ⅱto class Ⅲ in 2011—2012. The water quality of Huanglongxi and Yuedianzi, which are the exit sections of Minjiang river, had not meet the standards for many years, so the situation is grim. Therefore, it suggests making the effective delineation of ecological red line of the city's population and economic, establishing the linkage mechanism for water quality monitoring management and emergency water supply, popularizing the advanced managerial experience in the area where the water quality continuously improved, strengthening the treatment of class IV water area, to achieve the goal of water pollution control in Chengdu. |
