Mexico’s city sewage system under climate change Juan Manuel Anguiano Lozada Sistema de Aguas de la Ciudad de México Tel: (52) (5) 53-92-15-10 e-mail: email@example.com Mode of presentation: ORAL Identification of the congress sub-theme: 4. DEVELOPMENT OF WATER RESOURCES AND INFRASTRUCTURE (Urban infrastructure) Abstract This paper will try to analyze the evolution of the deterioration of the sewage infrastructure of Mexico City, taking account of the different existent scenarios, provoked by the climate change as well to propose and to analyze the current solutions related to the sewage infrastructure by the government and other groups The basin of Mexico, with a surface of 9600 km2, is located in the Mexican High Plateau, with an elevation of 2226 m.a.s.l. in a highly seismic zone and surrounded by volcanic formations, some of them are still active. The precipitation has a convective origin. Its distribution is irregular, its occurrence is higher in the western and southern zones of the Basin (More than 1000 mm/year) while the North and East have mean values between 350 to 450 mm/year. This rainfall distribution has been remained constant within the last 2000 years. According to the Intergovernmental Panel of Climate Change (IPCC, 2007), the Basin of Mexico will be affected in the next 100 years by an increase of temperature, this will affect the sewage system, due to a faster wastewater decomposition and therefore a higher rate of toxic and corrosive gazes, as well as the concentration of explosive gazes inside the tunnels, particularly for the Deep Sewage. Another factor to be considered is the hurricane frequency which is expected to occur more often and with higher intensity, this will bring a higher risk of hurricanes in Mexico City and its neighbor municipalities.