The site is located on the N-E side of Barcelona adjacent to the River Besos. The main emphasis of the mapping revolves around the rejuvenation of the Besos. The data traces down the drainage lines and the amount of grey and black water waste that is produced by various zones of the barrio. The data probes into the possibilities of passive systems and techniques towards cleaning up and revitalizing the river. In the existing scenario, the river has been channelized and human functions are strictly organized defined by the hard and soft spaces. We aim towards making the river more organic and have a more informal interaction with the pedestrians and also serve as a platform to clean and treat the waste water in a passive green way.