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不透水层下垫面蒸发是利用水量平衡法研究城市水资源评价的一项不可缺少的因素．目前．尚无可行的计算公式来推求它．而是通过试验分析的方法来确定。
The impermeable layer underlying surface evaporation is the use of water balance method of urban water resources assessment of an indispensable factor. Currently. There is no feasible formula to deduce it. But by experimental analysis to determine.