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Water scarcity has attracted plenty of attention from all over the world for recent decades. Comprehensive models need to be established to evaluate and solve this problem.This paper first build a dynamic model to evaluate the balance between demand and supply of water resources. The WSI indicator is used to express relationship between water demand and supply. The total demand is divided into three aspects. We define different calculation formulas which are related to industrial pollution,planting area and population. While the total supply is the addition of groundwater, the surface water, the trans-regional water drainage and the water in the reservoir. Economical scarcity is taken into our model consideration through the index NDI, which is the ratio of the water deficit and rainfall.Water resources carrying capacity evaluation model system is the comprehensive three-level hierarchy structure analysis, to evaluate water situation of the South Carolina.

A Dynamic Model to Evaluate the Balance between Demand and Supply of Water Resources