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灌南县的农业生产受灌溉水源不足的制约,粮食产量长期低而不稳,从建县的1958年起至1968年11年间,平均粮食总产还不到0.95亿公斤.淮阴地区发展自流灌溉之后,灌南处于涟东、涟中、涟西、柴沂、柴塘诸大灌区的下游,由于灌区大、干渠长,存在着“上游听淌、中游动抢、下游听赏”的局面.为了解决灌溉水源,经规划论证,确认缩小自流灌区、截短灌溉干渠,拦蓄回归水发展提灌是下游一项有效的措施.为此,决定自1969年开始,兴建回归水工程.1、蓄水工程1969年起,开始兴建盐东控制工程,包括北六塘河闸(9孔、净宽54米)、武障河闸(14孔、净宽88米)、龙沟河闸(17孔、净宽102米)、义泽河闸(4孔、净宽32米)及盐河南闸(1孔、净宽8米),拦蓄了上游4160平方公里的灌溉回归水和降雨径流,首先解决了灌南县盐西地区23万亩耕地的灌溉水源.
The agricultural production in Guannan County is restricted by the shortage of irrigation water resources. The output of grain has been low and unstable for a long time. From 1958 till now, the average grain output was less than 95 million kg from 1958 to the 1968. The development of gravity irrigation in Huaiyin Afterwards, Guannan was located in the lower reaches of Lianghuai, Lianzhong, Lianxi, Chaiyi and ChaiTang major irrigation areas. Due to the large irrigation and drainage channels in Guanzhong, there existed " Of the situation.In order to solve the irrigation water source, after planning demonstration, confirming the shrinkage of gravity irrigation area, truncated irrigation trunk, water storage and return irrigation development and irrigation is an effective downstream .To this end, it is decided to begin in 1969, the construction of return water project.1 , Water storage project Since 1969, construction of the Yandong control project has begun, including the northern Liutanghe sluice (9 holes with a net width of 54 meters), Wu Barrier (14 holes, net width of 88 meters), Longgou Hezha 17 holes and net width of 102 meters), Yizze River sluice (4 holes, net width of 32 meters) and Yanhe Nanzha (1 hole, net width of 8 meters), saved 4,160 square kilometers of upstream irrigation return water and rainfall runoff, First of all, it solved the irrigation water supply of 23 million mu of arable land in Yanxi County, Guannan County.