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１前言 永定河是全国四大重点防洪河流之一，一直受到国家防总的高度重视。至今官厅山峡洪水没有得到控制，是首都防洪安全的心腹之患，也对小清河分洪区及永定河下游泛区内河北省及天津市的防洪安全构成严重威胁。为了有效地控制官厅山峡洪水，在流域规划中先后提出修建三家店
1 Foreword Yongding River is one of the four major flood control rivers in the country and has always been highly valued by the national defense agencies. To date, the floods in Guanting Mountain Gorge have not been controlled and are the confidant of the capital’s flood control safety. It also poses a serious threat to the flood control safety of Hebei Province and Tianjin City in the flood diversion area of the Xiaoqing River and the Pan-Yongding River. In order to effectively control the floods of the Guanting Mountain Gorge, three planning stores were proposed in the river basin planning