最低地下水 meaning in English

basal water

2 . based on the analysis of the historical evolution of jinan springs ' spurting , a quantity equation between the anaual average spring discharge and the anaual lowest water table is built according to the statistic data , which enable us to gain the corresponding relation between baseline water level and the smallest scenic discharge of spring gushing . then the groundwater discharge in the spring area is calculated and the controlling parameter of maximum available amount of groundwater exploiting is obtained
泉域总面积1486平方公里。 (二)通过分析济南市泉群喷涌历史统计资料，首先建立泉群年平均喷涌量与年最低地下水位之间的定量方程，得出四大泉群喷涌的底限水位与最低景观流量的对应关系，然后，计算泉域内地下水的入渗补给量，再得出保证泉涌的地下水最大允许开采量的控制性参数。