地下水允许开采量是指通过技术经济合理的取水构筑物，在整个开采期内出水量不会减小，动水位不超过设计要求，水质和水温变化在允许范围内，不影响已建水源地正常开采，不发生危害性的环境地质现象的前提下，单位时间从水文地质单元或取水地段中所能取出的地下水量。
地面沉降条件下的地下水允许开采量评价必须以灾害性地面沉降不发生为前提，地面沉降的控制应是控制灾害性地面沉降。
The evaluation of the safe yield of ground water must be based on that the disaster ground subsidence don't take place. The control of ground subsidence is the control of disaster ground subsidence.
地下水资源评价主要解决的问题是符合给定水质条件下的允许开采量。
The main goal of the groundwater resources evaluation is to solve the problem that the right permissive mining yield of groundwater can be made decision under given groundwater quality.
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