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一、都市化与人口增长 1.用水量增加。一般说来,城市发展必然增加人口密度,加速工业和城郊农业的发展,增加城市工农业和生活用水量。京津二市据有关部门分析,平水年供需尚能基本保持平衡,枯水年和特枯水年都将缺水,估计到1990年枯水年(保证率P=75%)和特枯水年(P=95％)将分别缺水约43和55亿立米,2000年上述二个标准将分别缺水63和76亿立米。因此,城市
First, urbanization and population growth 1. Water consumption increased. In general, urban development inevitably increases population density, accelerates the development of industry and suburban agriculture, and increases the urban industry, agriculture and domestic water consumption. According to the analysis of the relevant departments, Beijing and Tianjin City, the supply and demand of water supply can still be basically balanced during the dry year and the dry year and the dry year will be short of water. It is estimated that the dry season (guarantee rate P = 75%) and special dry water Year (P = 95%) will have water deficits of about 43 and 55 billion cubic meters respectively. In 2000, the above two standards will have water shortages of 6.3 and 7.6 billion cubic meters respectively. Therefore, the city