河南省开封市引黄渠首闸在关闸停水时,常随大河或内河不同情况产生渠道淤积和引水口门淤死的现象。 过去,采用非用水期“拉河”、“拉渠”的办法解决泥沙淤积问题。用小流量长时间拉或用大流量集中拉,所放出的水可经渠道进入灌区沉沙池,也可直接经渠道退入排水 When the first gate of the Yellow River Ditch in Kaifeng City of Henan Province stops water at the gate and gate, it often causes siltation of channels and siltation caused by diversion at different points along rivers or inland rivers. In the past, non-water period “pull the river”, “drainage” approach to solve the problem of sedimentation. With a small flow of a long time to pull or concentrate with a large pull, the release of water through the channel into the irrigation basin desilting basin, drainage can also be directly discharged through the channel