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南水北调中线总干渠(以下简称总干渠)共穿越南阳市宛城区及方城县5个乡(镇),总长度约30km,均在鸭河口灌区范围之内,其与灌区渠道相交叉点共有83处,其中受影响程度最大的渠道是白桐干渠。由于原规划中将白桐干渠在该点的交叉建筑物设计为倒虹吸型式,不仅会直接造成渠道下游自流灌溉面积严重衰减,而且还会给灌区单位后期的维修和管理带来诸多不便。因此,为确保灌区整体利益最大限度地少受损失,建议修改原规划交叉建筑物连接型式。
The main canal of the Middle Route of South-to-North Water Diversion Project (hereinafter referred to as the “Main Canal”) traverses a total of 5 townships (towns) in Wancheng District and Fangcheng County of Nanyang City with a total length of 30km, all within the range of Yahekou Irrigation District and 83 Department, of which the most affected channel is white Tongguan canal. As the original planning of the Bai Tong trunk canal at this point, the cross-stilts are designed as inverted siphons, which will not only seriously reduce the gravity of irrigated area downstream of the channel, but also bring inconvenience to the later maintenance and management of the irrigated area. Therefore, in order to ensure that the overall interests of the irrigated area are minimized, it is proposed to amend the original planning of cross-connect type of buildings.