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贵州省长岗地下河系由主流和9条支流组成，被隔水边界封闭，结构完整，地下岩溶管道深切而狭窄，有跌水和深槽，地下水深埋，水力坡度大，动态极不稳定，是峰丛山区地下河的典型。地下河系内地表水与地下水统一于一体，水资源十分丰富，地下河出口水头落差大，具有良好的水力发电条件，修建地表水和地下水联合水库，使岩溶水得到充分利用。
Guizhou Changgang underground river system is composed of the mainstream and 9 tributaries. It is enclosed by water-diversion boundary and has a complete structure. The underground karst pipeline is deep and narrow with deep water and deep troughs, deep groundwater, large hydraulic gradient and extremely unstable dynamics , Is typical of the underground river in the mountain peaks. The underground river system integrates the surface water and the groundwater in the Mainland. The water resources are very rich. The underground river has a large water head gap with good hydropower conditions. The surface water and groundwater combined reservoirs are built to make full use of the karst water.