世界上绝大部分水库是建在地上的地表水库。当地形、水源等条件合适时,即可修筑地下坝体,截断潜流,所形成的地下蓄水区域,就是地下水库。地下水库有许多优点,如不占土地,投资低,蒸发量小,安全可靠,不需搬迁等。美国通过实际工程对比发现,地下水库的建设投资仅有地上水库投资的十分之一。日本的统计资料也表明,地下水库的投资额不过相当于地上水库的五分之二或二分之一,而且地下水库的运行管理费用要低得多。另外,地下水库不易发生溃坝,即使一旦溃 The vast majority of the world’s reservoirs are surface reservoirs built on the ground. When the terrain, water and other conditions are appropriate, you can build underground dams, cut off undercurrent, the formation of underground storage area, is the underground reservoir. Underground reservoirs have many advantages, such as not occupying land, low investment, small evaporation, safe and reliable, without relocation and so on. The United States through the actual project comparison found that underground water conservancy construction investment is only one-tenth of the groundwater reservoir investment. Statistics from Japan also show that the investment in underground reservoirs amounts to just two-fifths or one-half as much as that of above-ground reservoirs, and that underground reservoirs have a much lower operational management cost. In addition, the underground reservoir is not prone to dam, even if once collapsed