| In order to address the growing prominence of water supply conflicts in the southwest hilly areas in China, a group of large-scale water diversion projects are constructed continuously in the region and put into use. However, there is no similar large-scale, long-distance water diversion project for reference in southwest hilly region at all. The topic in this context is relying on the Tongguanyi Yangtze River water diversion projec, one of the four key projects of the water supply planning in western Chongqing, with emphasis on the theoretical analysis and applied research of large-scale, long-distance water pipe project applications, and water supply system water hammer protection method in the southwest hilly area.The total pipe length of Tongguanyi Yangtze River water diversion project is 105.44Km, with the maximum diameter of the water supplying pipe pipe DN1600, and the minimum DN250. The designed daily water supply capacity of the project is 265,000m3. The size of water adjusted from the Yangtze River Annually is up to 49.99 million m3 in the near future(in 2015) and 70.25 million m3 in the far future(in 2025) . The project consists of a primary water pumping station in Yangtze River, a secondary water pumping station in Majiagou, 3 tunnels, a sedimentation settling pool, a highly-positioned pool, a set of soil drying pools, five booster pump stations and 12 water supplying points.The area of Yunnan-Guizhou is hilly terrain with low mountains and hilly land, the slender mountains and wide terrains appear as two parallel parts. The construction of the project has taken these characteristics into serious consideration. And the tube type on the pipeline has been classified and optimized carefully,according to its diameter size. The larger ones (DN800 ~ DN1600) use metal and PCCP pipe,which is large-scale application of PCCP pipe in the hilly terrain areas of Yunnan-Guizhou for the first time.The main contents and conclusions of the text are as follows:â‘ According to the pipe selection in large-scale water transfer projects at home and abroad, we have put emphasis on the comparative study of three kinds of pipes: the steel pipe, ductile iron pipe PCCP pipe , Which comes to the conclution that: steel pipe mixed with PCCP pipe is the best scheme in the water transfer project of southwest hilly areas.â‘¡Conbine pipe selecting scheme with the actual designing and construction situation in the Tongguanyi project , Taking the basic design and construction of the pipeline , its installation and piping pressure test ,and other aspects into deep account, we finally concluded the key points of the selection and application of pipe in the large-flow and long-distance water transfer project of southwest hilly areas.â‘¢Compaired with the current method of water hammer protection, both systematic water hammer effect and the water diversion system after taking protective measures in Tongguanyi Yangtze River water project have been put into computer simulation study and analasis. As to the water hammer protection in similar projects of the southwest hilly region, it is suitable to combine regular installation of water-hammer eliminates devices along the pipeline and in the pumping stations and proper increasing of the pressure ability of certain pipes. combining the two programs more appropriate.This scheme brings good results in the practical application of the project .The significance of the results of this research project are as follows: Relying on the Tongguanyi Yangtze River water projects, large-scale water diversion project hilly area southwest of the choice of application of pipe and water systems in the study of water hammer protection method is feasible, the results of their research for the future construction of similar projects also have an important reference value and significance.
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