Collective Ecology approaches the city as a series of associative processes developing form, organising relationships, and exchanging materials throughout an urban system. Focusing on hydrological flow, a systematic approach for the formation of novel architectural and infrastructural morphologies explores their collective relationships in the development of a new urban system. Within this context, the project explored the potential to decrease hydrological flow in and out of the urban environment through localised water treatment processes, while also increasing the amount of total green space. The resulting urban model demonstrates the possibilities in which infrastructure can be integrated within the urban and architectural morphologies, serving as a component part within a larger collective system.