Conventional estimates of river volume come from rainfall, of course, and from measurement of the water that seeps from soil and groundwater reserves.

传统测量河流流量的方式主要是通过分析降雨量，土壤伸出的水量以及地下出水量得出的。

In the midst of the drought in California, the massively irrigated almond counties are the driest and have seen the biggest decreases in groundwater reserves.

在加州的干旱中，大规模灌溉的杏仁县是最干旱的，地下水储量减少最多。