一、地下水资源的分类我们认为,地下水资源分类必须以地下水均衡为基础,这样才能比较客观地反映地下水的流动性和可恢复性的特点。从开采实际要求出发,不仅要重视水量上的均衡,而且要注意水中含盐量,含水层和非含水层的水、土力学上的均衡等等。地下水的均衡系指某个均衡地段与均衡时期内地下水的收支关系。而三个基本均衡 I. CLASSIFICATION OF GROUNDWATER RESOURCE In our opinion, the classification of groundwater resources must be based on groundwater equilibria, so as to objectively reflect the characteristics of groundwater mobility and recoverability. Starting from the actual requirements of exploitation, we should not only pay attention to the balance of water, but also pay attention to the water content of salt, aquifer and non-aquifer water, soil mechanics and so on. The balance of groundwater refers to the relationship between income and expenditure of groundwater in an equilibrium area and the equilibrium period. The three basic equilibrium