引言在傍山终建渠道时,经常在沿渠靠山一侧分段开挖小环山渠,把降雨产生的山面水和由于雨水冲刷带来的泥沙引至天然冲沟,然后采用山洪渡槽、穿渠底涵洞等方式把它引出渠外。实践证明,此方法对渠线较短、山洪集流面积不大的渠道是有效的。如渠线较长,则一般均由渠道截取山面水,再沿渠 Introduction When the tunnels are finally laid along the hillside, excavation of small ring canals along the side of the canals along the sides of the mountain often lead the mountain water produced by the rainfall and the sediment caused by the rainwater erosion to the natural gully. Aqueduct, through the culvert at the end of the channel to lead it out of the canal. Practice has proved that this method is effective for short-channel, flood-less channel is effective. If the canal line is longer, the mountain water is generally intercepted by the channel and then along the canal