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我省中、小型水库工程绝大多数是土坝或土石混合坝,由河岸开敞式溢洪道泄洪。河岸开敞式溢洪道进口可分为有闸门控制和无闸门控制两种。无闸门控制的溢洪道进口建筑物一般为溢流堰或明槽,其特点是溢流口宽,水深浅,单宽流量小,故又称为宽浅式进口或宽浅式溢洪道。这种进口的优点是:(1)口宽,随着库水位的上升,泄洪流量增加较快,有利于抗御较大洪水;(2)工程简单,运用可靠,没有闸门和启闭设备,管理方便。我省小型水库溢洪道基本上都采用宽浅式进口,中型水库溢洪道采用这种进口型式的也较多。
In our province, the vast majority of medium and small reservoir projects are earth dams or earth-rock mixing dams, which are spilled by open river spillways. Bank open spillway imports can be divided into a gate control and no gate control two. Spillway gateless spillway entrance buildings are generally overflow weir or open slot, which is characterized by overflow port width, depth of water, single-wide flow is small, it is also known as wide shallow-type imports or wide spillway. The advantages of this import are: (1) mouth width, with the rise of the reservoir water level, flood discharge increased rapidly, is conducive to resist larger floods; (2) the project is simple, reliable, without gate and hoist equipment, management Convenience. Small reservoirs in our province are basically spillway wide shallow imports, medium-sized reservoir spillway using this type of import are also more.