井灌工程是平原农业区抗御干旱灾害的重要水利设施。近几年来气候连续干旱,普遍分布的地下潜水得不到大气降水的入渗补给,又加上抗御干旱大量开采地下潜水,致使潜水位连年下降,在地势稍高处水位埋深已接近离心式水泵的有效吸程,造成离心泵抽水时出水量不足,灌水时间延长,灌水成本提高。 在非故河道分布段广泛采用的塑管真空井、因井来水量减少而报废;在沿地下水强泄水带的河流两岸因井水位太深离心泵不能利用,只得更换为潜水电泵后,才能正常使用。 造成井水位下降的根本原因是地下水资源失衡问题,在治水战略上必须采取补源措施。解决补源的途径有三条:其一是地域性调水;其二对地表水体实行截、拦、蓄工程措施,增加地表水源灌溉用水量,碱少地下水开采 Well irrigation project is an important water conservancy facilities in the plains agriculture area to resist drought and disaster. In recent years, the climate has been continuously droughts, the widespread underground diving can not get infiltration recharge of atmospheric precipitation, and the large number of mining underground diving scavenging drought, resulting in declining diving position year after year, in the upper reaches of the water depth is close to centrifugal Effective pump suction stroke, resulting in centrifugal pump pumping less than the amount of water, irrigation time, irrigation costs increase. Plastic pipe vacuum wells, widely used in the non-ancient river sections, are discarded due to the reduction of water flow in the wells; centrifugal pumps can not be used due to the deep well water level along both sides of rivers along the groundwater drainage pipelines, To normal use. As a result, the fundamental reason for the decline of well water level is the imbalance of groundwater resources. Therefore, it is necessary to take measures to supplement resources in the strategy of water management. There are three ways to solve this problem: one is regional water diversion; the other is to implement cutoff, block and reservoir engineering measures for surface water bodies, increase the amount of irrigation water for surface water sources and reduce the exploitation of groundwater