The advantage of the grey planning is that the grey planning can take the effects of many unknown and accidental factors in the river water quality system into consideration.
灰色规划考虑了实际河流水质系统中客观存在的不确定因素和偶然因素影响。
The grey planning for river water quality system can be carried out using the grey model for the river water quality system.
借助于河流水质灰色模型，可以对河流水质系统进行灰色规划。
Some problems of the city drainage engineering construction are discussed from the urban drain system planning for the new district in the west of Qinhuai River in Nanjing.
由南京河西新城区水系规划反思以往城市排水工程建设中存在的问题。
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