在溪、河中修建水坝,把水拦蓄起来,抬高上游水位,可以改善通航条件,引水灌溉下游两岸的农田等等,这些好处是尽人皆知的。坝的种类很多。到目前为止,无论用哪一种材料修建的哪一型类的坝,都是屹立在河床中不可移动的。最近,苏联发明家M·柯岗却设计出 Building dams in rivers and rivers, blocking water, and raising the water level upstream can improve navigation conditions, divert water to irrigation fields on the banks of the lower reaches, etc. These advantages are well known. There are many types of dams. So far, any type of dam built with any kind of material is standing in the river bed and is not movable. Recently, the Soviet inventor M. Ke Gang has designed