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南水北调中线总干渠陶岔—沙河南段横跨江、淮两大流域，地形对暴雨的影响明显，暴雨、洪水变异极大。根据内乡、镇平、南阳、方城４县市有记载以来的历史文献资料以及５０年代至今各单位的历史洪水调查成果，对该渠段４００多年来发生的大和特大洪水从雨、水、灾情等方面进行了综合分析，得出了历史洪水发生的一些规律，调查分析的１９１９年和１９７５年特大洪水成果，为南水北调中线工程初步设计中水文设计洪水所采用。
South-to-North Water Diversion Middle Route The main channel of the Tao Cha-Sha River stretches across two river basins of the river and the Huaihe River. The impact of the terrain on the heavy rain is obvious. The heavy rainfall and the flood vary greatly. According to the historical documents and data from the four counties and cities of Neixiang, Zhenping, Nanyang and Fangcheng and the historical flood investigation results of the units from the 1950s to the present, the major and major floods occurred over 400 years in the channel have changed from rain, water, Disaster and other aspects of a comprehensive analysis of the history of floods came to some of the laws of investigation and analysis of extraordinary floods in 1919 and 1975 results for the design of the midstream project of the South to North Water Diversion in the hydrological design flood used.