Study On Functional Planning And Water Environmental Capacity Of Drainage Area

Since the application of reformation and open policy, the social economic has embodied a sustainable and rapid development, the integration national power and human's living conditions have improved gradually, meanwhile, the problems on water environment come forth increasingly. According to "Gazette of Chinese environmental condition in 2004", among the 412 water quality monitoring sections in seven main water systems, the III class water and above take only 41.8%. Apart from water resources shortage due to water resources quantity itself in some region, some developed regions with abounding water resources appear frequently water resources shortage due to water quality factor, which hinder the economic development in local society. Therefore, it is an emergent task to carry out water functional planning, quantify the water environmental capacity, and determine gross amount control scheme according to the demands of social economic sustainable development and eco-environmental protection.Based on the real condition of Lanxi city midstream of Qiantang River in Zhejiang province, this paper analyses its social economic actuality, and evaluates the present water quality, and determines the water functional planning, and investigates the contaminant source entering into the functional planning. The proper model is selected to calculate the water environmental capacity. The object and ideas of gross amount control are proposed. Finally, some measures and suggestions are proposed to achieve these goals, which also provide basic reference for local water resources conservation bureau, and provide basis for further study on water environmental capacity in Zhejiang province.