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五里冲水库是我国岩溶地区成功修建的第一座深过百米的盲谷无坝中型水库，是南溪河调水入蒙自、个旧地区的调节水库，工程量大，地质条件差，施工难度大，技术难点是强溶蚀渗漏区的防渗。通过大量地质勘测，防渗帷幕选线，两端为砂板岩不透水层，防渗底界为1200m以下发育微弱的岩溶层。强溶蚀地层防渗帷幕采用分层搭接悬挂式结构，在暗河、溶洞及岩溶塌陷处采用混凝土堵头、混凝土防渗墙及多排高压灌浆处理。经过蓄水运行及各种监测数据分析，防渗体系渗流量小于5L／s，溶塌体稳定，工程质量优良。
Wulixong Reservoir is the first blind valley no-dam medium-sized reservoir in the karst area successfully built in China. It is a reservoir for regulating the diversion of Nanxi River into Mengzi and Gejiu areas, with large engineering quantities, poor geological conditions, Construction is difficult, the technical difficulties are strong erosion seepage seepage zone. Through a large number of geological surveys, anti-seepage curtain line selection, at both ends of the sand slate impermeable layer, impermeable bottom boundary of 1200m below the development of weak karst layer. Impermeable stratum anti-seepage curtain stratified by hanging over the structure, in the dark river, cave and karst collapse with concrete plugs, concrete cutoff walls and multi-row high-pressure grouting treatment. After the water storage operation and various monitoring data analysis, seepage prevention system seepage flow is less than 5L / s, stable collapse, engineering quality.