Relationship between the precipitation and the declining quantity of the groundwater is highly linear correlation and the correlation coefficient is 0.7798. When yearly precipitation increases 100 millimeters, the groundwater level will ascend 0.66 meter.

• 年降水量与年地下水位下降速率呈高度线性相关；相关系数r=0.；7798；年降水量每增加100mm则地下水位可回升0