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我区石堡川水库干渠上的长宁河倒虹为一双管桥式倒虹,管径1.4米,单管长448米,设计水头60米,用钢筋混凝土现浇而成。最大过水流量8米~3/秒。1974年建成通水。1978年4月8日进行春灌时发生事故,当即对事故进行了处理,从而保证了正常的灌溉。现将处理办法简介如下。
I District Quartet Reservoir Canal on the Changning River inverted rainbow as a double bridge inverted inverted siphon, diameter 1.4 meters, 448 meters long single pipe, head design 60 meters, with reinforced concrete cast. The largest cross-flow of 8 meters to 3 / second. Built in 1974 through the water. On April 8, 1978, an accident occurred during spring irrigation and the accident was immediately dealt with to ensure normal irrigation. Now the treatment method is as follows.