A function relationship between the daily rainfall over a large area and its area has been researched using the observed precipitation data in China in recent 40 years.
根据中国近40年逐日降水观测资料，分析了大范围空间域上不同等级日降水量与其占有面积的函数关系。
The surface water, precipitation and undercurrent are main to the groundwater in well irrigated area while in plain area surface water and rainfall are main replenishment.
井灌区地下水主要靠地表水、降雨和潜流补给，平原井灌区主要靠地表水和降雨补给。
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