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The theme of World Water Day in 2015 is water and sustainable development, which arouse our great attention to clean water scarcity. There are two models in this paper. Model one is the application of system dynamics in water resources. Aimed at the dynamic nature, the main factors of level, rate and auxiliary are carefully selected. Therefore, the recursive equations are set up based on the numerical relationship and time relationships. Model two is an evaluation model. Before applying it to assessment, a consistency check is performed with entropy and proves fruitful in water resources. Then some main levels like population, available water resources are determined from the system dynamics model above to construct the water carrying capacity index (WCCI).Taking Pakistan as an example, we have done the calculation, and the calculation results show the feasibility of the method.

Application of System Dynamics and WCCI in Water Resources Evaluation: Taking Pakistan as an Example