北汝河和石河之间以及石河右岸地势较低，北汝河和石河洪水漫溢出槽；南水北调中线工程总干渠及各河道建筑物修建后缩窄了行洪断面，对河道的行洪产生一定影响，上游水位壅高、淹没时间延长，上游耕地和村庄淹没水深有所增大。结合北汝河串流片特点对淹没影响进行处理，选定了征迁安置、河道防护、河道治理、河道防护与河道治理结合4个处理方案进行研究比选，按照技术可行、经济最优并最大限度的保障受淹没影响村民安居乐业的标准，选定方案3即河道治理方案为最优方案。

The inundation areas between the Beiru River and Shi River and at the right side of the Shi River are at high risk of flooding due to low elevation. Construction of the main channel and river buildings in the Middle Route of South-to-North Water Diversion Project decreases the cross section of flood flowing area and therefore affects the flood flowing in the river with higher water level and longer inundation time in the upstream of river. The inundation depth of farmland and village increases in the upstream as well. In this paper, four different engineering measures for mitigating the inundation effects were compared based on the furcating-conflux flow characteristics of Beiru River, including the resettlement, river protection, river treatment, and combination of river protection and treatment. The results showed that the third measure is the best option in consideration of technical feasibility, economic optimization, and guarantee of people’s living standards to the maximum extent.