案由:南水北调中线工程跨江、淮、黄、海四大水系,横贯湖北、河南、河北、天津四省市直至北京,引水干渠长1432公里,受水区范围15.5万平方公里,人口1.1亿,国内生产总值占全国的10%以上。南水北调中线工程以十堰丹江口水库为发端,将丹江大坝由162米加高至176.6米,设计蓄水位由157米提高至170 Case: The four water systems across the river, Huai, Huang and Hai across the mid-route of the South-to-North Water Diversion Project run across 1432 kilometers of the four provinces and municipalities in Hubei, Henan, Hebei and Tianjin to Beijing. The water diversion trunk reaches 1,432 kilometers in length and has a water area of ​​155,000 square kilometers and a population of 110 million. The gross domestic product accounts for more than 10% of the national total. The mid-route of the South-to-North Water Diversion Project started with Danjiangkou Reservoir in Shiyan, raised the Danjiang Dam from 162 meters to 176.6 meters, and designed the water level from 157 meters to 170