需求表水一个单元在目标环境中可能拥有的需要。
Requirement represents the need that a unit may have in the target environment.
其来源有五：雨水、水、表水(浅井水)深井水和泉水。
It is derived from five sources, - rains, rivers, surface-water or shallow Wells, deep Wells, and springs.
根据对渗入率设计指标的分析，一定损坏状况的路面渗透系数是影响路表水渗入率大小的关键。
Based on the analysis of the criterion of road infiltration, it was the pavement infiltration on some damage condition which affected the road infiltration.
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