The trend of using volunteered and crowd data in natural disaster contexts is growing. This fact coupled with scenarios of flooding that occurred in the city of São Paulo, brings the possibility of exploration about the voluntary and collaborative approach to the generation and transmission of the geographic information dynamically. And these possibilities are provided by technologies accessible to the population, such as GPS (Global Positioning System) embedded in cell phones and internet. This article aims at presenting a conceptual scheme for a dynamic and collaborative mapping system of flooding, whose data source corresponds to those equipped with mobile devices that enable location. The results correspond to the conceptual schemes of the system as well as the prototype "Points of Flooding" - available map on the web with the points of flooding, provided at the time of the event by people. The prototype was developed through the free and open source platform - Crowdmap/Ushahidi The system was evaluated by a questionnaire answered by users, who stated their opinion about the viability of this as well as the adjustments that must be done for the effective use by population.
Collaborative Map; Cell phones; Flooding
