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[B-12.3 Impact of Global Warming on Urban Water-supply and Sewerage System]

[Contact Person]

Hiroshi Tsuno
Dept. of Environmental & Sanitary Engineering
Faculty of Engineering, Kyoto University
Yoshida, Sakyo-ku, Kyoto, 606-01 Japan

[Total Budget for FY1990-1992]

9,256,000 Yen

[Abstract]

　Factors which are affected by global warming and impact the urban water-supply and sewerage systems are listed, and correlation among them are identified. Water temperature in euphotic zone of lakes are found to increase by about 1 degree of centigrade with each 1 degree of centigrade increase of atmospheric temperature from the correlation analysis with the data of Lake Biwa, 26 lakes in Japan 116 lakes in 50 countries and areas. Stimulation of algal growth and depletion of dissolved oxygen in hypolimnion are shown by surveyed data and simulation model. By using the developed model, the extent of effect can be assessed at a given site. Effects by increase in biochemical reaction on water quality in rivers and on sewage treatment efficiency are discussed. Increase extent of flowrate of water usage in water supply in Japan is also discussed and shown to be about 6 L per person per day with increase of 1 degree of centigrade. And corrosion of sewage facilities caused by infiltration of sea water is also taken Into consideration.

[Key Words]

Global Warming, Water Supply, Sewer, Lake