The Study Of Optimization And Safe Regulation Of Gravity Water Supply Networks In Hilly Villages

This paper is based on a planning project of gravity water supply networks in hilly villages. As we all know, there are much differences between water supply networks in hilly villages and cities. Firstly, the difference of elevation between gravity water supply networks in hilly villages and water sources is very big. The pressure of pipelines in low area is high and the question of tube burst is serious. Secondly, the layout of mountainous villages affects the extension of pipelines and the reliability of it. In addition, it is far difficult into rings. Thirdly, the water consumption of villages and small towns is small and non-uniform. And hourly variation coefficient is big. All of that increases the investment of pipelines. Therefore, thinking into the characteristics of gravity water supply in hilly villages, to design rational, economic and efficient operation of pipe networks can reduce the cost of construction and operation of water supply networks. And it becomes an important link of improving the benefits of water supply enterprises in villages.In the paper, the characteristics of gravity water supply networks in hilly villages are explored and researched in many ways. First of all, I have researched thoroughly the basis for the design of water supply networks, the layout and simplification of water supply networks and the hydraulic analysis of pipeline system. And the conditioning device of decompression water that is suitable for gravity water supply networks in hilly villages has been designed. Besides, the structures, operation modes, volume and installing location of the device are researched systemically. Next, the present situation and background of optimal design of water supply networks are introduced, as well as the theory of optimal design of water supply networks and the mathematical model of water supply networks are discussed. Taking the discounted value of the minimum annual of the total cost of pipelines as the goal, adding the reliability of water supply networks to the constraint, and the approach to solving and planning to optimize pipelines has been proposed.Centralized water supply networks in the four acres of land reservoir have been optimized using the optimal model. By contrasting the optimal results of pipelines before and after installing the conditioning device of decompression water, the economic benefits of adjustment devices and optimal models are determined. It is strong practical and economic. And it has some guidance on the optimal design of gravity water supply networks in hilly villages.