【正文】 量分別為 289780 t、 t，蘇北COD、氨氮的入河量分別為 t、 t。表 43 水質超標率與削減率對比表蘇南 蘇北 全省　 地區(qū) 指標 COD 氨氮 COD 氨氮 COD 氨氮水質超標率 % % % % % %削減率 % % % % % % 圖 43 功能區(qū)水質超標率與削減率對比圖（COD）圖 44 功能區(qū)水質超標率與削減率對比圖（氨氮）由上述圖表可知，全省污染物的削減率與水質超標率相差在 20%以內，削減率與水質超標率基本吻合，說明本次納污能力核定的結果基本合理。蘇北以及全省的 COD 入河量小于納污能力，對于蘇南地區(qū)，COD 的入河量大于其納污能力。按照上述實施水功能區(qū)限制總量和區(qū)域總量控制相結合的管理制度，目標明確，針對性強，有利于水體保護目標的實現。加強設計水文條件選取合理性，包括動態(tài)水文條件選取等的研究39工作；加強對不同污染源類型，不同生態(tài)環(huán)境狀況等復雜情況下的水質降解系數的研究工作。（3）完善水功能區(qū)的水質監(jiān)測體系。 basin。(4)Water environmental capacity is the sum of the basic water environmental capacity determined on environmental standards values and background values and the changing water environment capacity determined on selfpurification ability. The various definitions reflect different aspects and the part meaning of the water environmental capacity, but not the overall exposition of the water environmental capacity. 河海大學環(huán)境學院環(huán)境工程專業(yè) 08 級畢業(yè)設計45Now more consistent concept of water environmental capacity is: under certain environmental goals, territorial waters can take the maximum allowable load of exogenous some (classes) pollutant. Three categories important factors which affect the water environmental capacity Environmental objectives are water environmental characteristics and pollutants characteristics. In addition, the water environmental capacity is closely related to the emission approach s and emissions spatial of pollutant. Water environmental capacity can be seen as a natural resource, developing and using of this resource, we can reduce the burden on sewage treatment and reduce the treatment costs. 2 Analysis of water environmental capacity Water environmental capacity is the management control objectives based on the scientific research of the hydrological characteristics, methods of sewage, pollutant migration and transformation, in the same time bined with environmental management needs. 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