This paper analyzes systematically the hydrochemical types and the hydrochemical characteristics of surface water and groundwater in the different aquifers in the Heihe River watershed.
通过银川平原地下水水化学资料分析，证实这种水化学图可用于确定地下水的水化学类型，并进行水文地球化学规律研究。
In the mountainous watershed of the Heihe River, the runoff coefficient is much larger than that of the whole arid area, but it is still less than the average value over the whole country.
黑河山区流域径流系数远比干旱内流区的平均值大，但要小于全国的平均径流系数。
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