我国自1958年大跃进以来,建成了大量的中小型水库工程,这些水库工程分布在全国各个河道干支流的中上游,使干早缺水的山区出现了“人造湖”,大大改变了山区的自然面貌。同时,在我国1959年气候反常,雨量失调,许多地区遭受严重水旱灾害威胁的情况下,这些水库工程,对抗旱保苗,适时灌 Since the Great Leap Forward in 1958, a large number of small and medium reservoirs have been built in our country. These reservoirs are distributed in the upper and middle reaches of all the rivers and tributaries of the country, causing “man-made lakes” in the dry and dry areas, greatly changing the natural face. In the meantime, under the circumstance of the abnormal climate in our country in 1959, the imbalance of rainfall and the threat of serious floods and droughts in many areas,