目前农药的使用越来越广泛，而地表水资源却日益短缺。
Ground water and surface water are the main resources of the drinking water at present time.
采用扣损法和改进的WAM模型分别分析计算了汉江流域地表水资源可利用量。
The available quantity of surface water resources in the Hanjiang River Basin is computed respectively by deduction method and improved WAM.
结果表明：在现状下垫面等条件下，渭河流域陕西片的地表水资源主要取决于降雨资源。
The results showed that under the status of land surface, the surface water resources of Weihe River Basin in Shaanxi mainly depends on the rainfall.
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