提高官厅水库防洪标准的几点措施郝玉敏永定河千百年来养育了两岸的人民，造就了两岸的社会进步与文明，但它也给两岸人民，特别是下游人民带来了深重的灾难。据史载１７３６～１９１１年间的１７６年中永定河就发生洪害４９次，平均３～４年就发生一次。每次都是淹没良田... Measures to Improve Flood Control Standards for Guanting Reservoir HAO Yu-min Yongding River raised people across the Taiwan Strait for thousands of years and created social progress and civilization across the Taiwan Strait. However, it also brought deep disaster to people on both sides of the Strait, especially the lower reaches. According to the history of 1736 ~ 1911 176 years in Yongding River flood occurred 49 times, an average of 3 to 4 years once. Flooded farmland every time ...