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一前言在我国巳建的中小型水库工程中,多数为土坝或土石混合坝挡水。在河岸布置溢洪道,而且绝大多数采用无闸开敞式溢洪道。这种溢洪道的优点是:节省闸门和启闭设备,施工简便,运行可靠,便于维修和管理,但由于溢洪道的作用特殊,往往要耗费总工程费用中相当大的一部分,如溢洪道过宽,则工程费用将显著增加,所以,就节省工程费用而言,溢洪道宽度愈窄愈好,但过窄往往要对其表面进行处理,并且需要相应采取
A foreword Most of the small and medium reservoirs built in our country are earth-dam or earth-rock mixed dam. The spillways are arranged on the banks of the riverbank, and the vast majority use open spillway without gates. The spillway has the following advantages: saving gates and opening and closing equipment. The construction is simple, reliable and easy to maintain and manage. However, due to the special functions of spillways, a considerable part of the total construction cost is often incurred. If the spillway is too wide, The cost of the project will increase significantly, so the narrower and narrower the spillway, the narrower and the narrower the spillway width is, the more often it is necessary to deal with the surface and need to be taken accordingly