A field training school has been organized in Nantes (France) in August 2008 about urban water hydrology. Twenty researchers (seniors and graduate students) attended this summer school intended to learn more about the quantification of pollution fluxes in urban water systems. The aim is now to extend this first experience and to organize an international field training school during the summer 2010. After a general presentation on water in cities (historical background, sewage collection, urban streams, etc), theoretical presentations on sensors (for flow rate and pollution), practical sessions and site visits will be blended together, in order to get a very interactive program. Students and other participants will have the opportunity to present posters on their own work. The aim is to encourage discussion between participants on water-related metrology in cities, so they can develop research projects with an international perspective. Using the opportunity provided by the relationship between the CNRS Zone Atelier program in France and the LTER network, the 2010 Jules Verne Summer School will be focused on the French and US practical approaches of urban water metrology.