1—2.3 (略)2.4 与水库和大坝有关的地下水2.4.1 (略)2.4.2 水库的不透水性如果邻近存在一沟谷,且水库和邻近沟谷间的岩体非常透水,则水库的不透水性就会受到威胁。此时地下水位通常很低,不超过库水位。如在图4(略)中形成渗过山体的渗流流线,水流渗向邻近的沟谷。在极端不利情况下这会妨碍水库的蓄水。位于石灰岩岩溶地区的水库 1-2.3 (omitted) 2.4 Groundwater associated with reservoirs and dams 2.4.1 (omitted) 2.4.2 Reservoir impermeability If there is a nearby gully and the rock mass between the reservoir and adjacent trenches is very permeable, the reservoir’s Impermeability is at risk. At this point the groundwater level is usually low, not exceeding the reservoir water level. As shown in Figure 4 (omitted) to seepage flow through the mountain flow lines, water seepage into adjacent trenches. In extreme cases this can hinder the storage of the reservoir. Reservoir in limestone karst area