绪论在最近这一年里,我们的农业起了根本的改变。农村合作化运动胜利完成以后,政府颁布了十二年农㏒发展纲要,给农业生产画出了一幅美丽的远景。如今,全国上下都在为着这个崇高的目标而奋斗,我们有信心完成前人所从未做过的事业。农业增产的基本环节之一,在于扩大灌溉面积,使干旱不毛之地变为肥沃的良田。随着农业需水的日益激增,可以予见在不久的将来,全国许多地区都会感受水源 Introduction In recent years, our agriculture has undergone fundamental changes. After the victory of the rural cooperative movement was completed, the government promulgated a 12-year outline for the development of farms and gave a beautiful prospect for agricultural production. Today, all over the country are struggling for this lofty goal, and we are confident in fulfilling the cause our predecessors have never done before. One of the basic steps in increasing agricultural output is to expand the area under irrigation and turn the arid barren land into a fertile farmland. With the increasing surge of agricultural water demand, we can see that in many places across the country in the near future, water will feel