A Method of Water Supply Planning for a Large-scale City

The 2nd Japan-China Joint Symposium, 2009 (JCIS2009), which is sponsored by the Electronics, Information and Systems Society, the Institute of Electrical Engineers of Japan (IEEJ), was held on April 16-18, 2009 at Harbin Institute of Technology Weihai campus in Weihai, Shandong, China (Photo 1). JCIS2009 had seven sessions, which are related to Operating System, Offshore Software Development, Enterprise Application, Agent-oriented Software, Industrial Software, Decision Support Systems, and Algorithm, and 25 presentations were made by Japanese and Chinese researchers. The number of audience in JCIS2009 was about 200, and we had much discussion on presentations and exchange of information through the banquet etc.

We presented the research about a method of water supply planning for a large-scale city, which is a title of our research topic. The method is a technology for the optimum supply planning of water in the water supply system.

The water supply planning is to plan when and how much water is drawn from water resources, purified in purification plants, and kept in water stations. A method of water supply planning makes the optimum water supply plan which realizes water flow leveling of pipes under constraints of upper/lower limits of facilities in accordance with water demand fluctuating from hour to hour (Fig. 1). The challenge of water supply planning is improvement of the degree of water flow leveling especially for a large-scale city, because its water supply system has lots of facilities.

Our approach for the above challenge is to solve minimum cost flow problem by the linear programming with the adequate parameters which are derived from another water supply planning method for a single facility (Fig. 2). We made simulation for the proposing method and verified the effects.

(By Takashi Fukumoto, Systems Development Laboratory)