China possesses of 22 percent of world population , but it only enjoys 6 percent of world water resource . there are above 400 cities shorting water in 668 cities of china . in order to satisfy increasing demand to water supply , some city blindly overexploits groundwater , which results in regional water level descending and induces ground sedimentation and crack geologic disaster 中國擁有世界22的人口卻只享有世界6的水資源,全國668個城市中,有400多個缺水,為了滿足日益增長的供水需求,一些城市盲目超采地下水,導(dǎo)致水位下降、地面下沉、海水倒灌,進而污染了地下水。