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1 概述大功引黄灌区封丘一千渠在距渠首2.78km处,跨越大型排涝河道天然渠。该交叉建筑物设计流量13.6m~3/s,控制下游7个乡、1万多公顷农田的灌溉,是大功引黄灌区的关键工程。根据一干渠设计水位和天然渠设计洪水位情况,该处若修建槽身横断面为常规型式的渡槽,经计算槽底高程最少低于天然渠设计洪水位0.4m,会成为天然渠阻洪工程;若修建倒虹吸,虽然解决了阻洪问题,但倒虹吸
1 Overview Dafeng Yellow River irrigation area Fengqiu a thousand canal 2.78km away from the head of the canal, across the large drains natural channel. The cross-building design flow of 13.6m ~ 3 / s, the control of the downstream seven townships, more than 10,000 hectares of farmland irrigation, dredging is a key project Dali Yellow River. According to the designed water level of a main channel and the design of floodplaces in natural drains, if the aqueduct is constructed with conventional cross-section of aqueduct and its bottom elevation is calculated to be at least 0.4 m below the design flood level of natural drains, If inverted siphon construction, although to solve the problem of flood, but down siphon