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小南海水库库盆为中下奥陶统碳酸盐岩，受顺河断裂控制，深部发育有深层岩溶水径流带，库区处于悬托状态。１９９３年加固施工期间，因群众在库底开采中奥陶统底部的石膏，巷道沟通了库水与深层岩溶水，引起了库水集中渗漏，致使水库干涸，再也无法蓄水。为了止漏，专门进行了水文地质和巷道沟通库水与深层岩溶水具体情况的调查，采取截堵方法封闭主要漏水巷道，止漏工程量和投资较少，取得了较好的效果和明显的经济效益。
The Xiaowanhai reservoir basin is a middle-lower Ordovician carbonate rock controlled by the Shunhe fault, with deep karst water runoff developed deep in the reservoir area. During the reinforcement construction in 1993, because the masses were mining gypsum at the bottom of the Ordovician at the bottom of the reservoir, the gallery communicated with the reservoir water and deep karst water, causing concentrated leakage of the reservoir water, causing the reservoir to dry up and unable to water anymore. In order to stop the leakage, we conducted a special survey of the hydrogeology and tunnel communication with reservoir water and deep karst water. Taking the blocking method to close the main water leakage roadway, the project has less leakage and investment, achieved good results and obvious Economic benefits.