Challenges foreseen in Lisbon as a result of climate change are an increase in temperature together with a reduction in annual precipitation with a concomitant increase in rainfall intensity and sea level rise.
Concerning water supply systems, the shortage of water will have an impact on the quality of surface water sources and aquifers may be affected by saline water intrusion due to sea level rise. Wastewater systems are potentially affected by increased rainfall intensity aggravating flooding and combined sewer overflows and affect-ing WWTP efficiency. The temperature increase will raise the likelihood of sewer corrosion and odour problems. The sea level rise can decrease the hydraulic capacity of downstream sewers and increase salt water intrusion. Lisbon will demonstrate the water cycle safety plan (WCSP) framework to better assess and manage climate change related risks in the urban water cycle. A second demonstration for the Lisbon water supply system uses real time monitoring and modelling of chlorine for disinfection control via booster stations. The development of an innovative monitoring of combined sewer overflows and an early warning system for faecal contamination in rec-reational waters (third demonstration) will allow wastewater utilities to be better prepared and to respond faster to any contamination due to combined sewer overflows and uncontrolled runoff caused by more frequent and heavi-er rainfall.
Demonstration managers: José Menaia (System for distributed real time disinfection control), and Luis David (System for early warning for faecal contamination in recreational waters) Websites: http://www.epal.pt , Maria do Céu Almeida (Water Cycle Safety Plan), http://www.simtejo.pt , http://www.Inec.pt.