Worldwide, urban areas are being challenged to improve the conventional stormwater management regime (i.e. the totality of
beliefs, rules and practices that guide water management activities). Illustrated as the Water Sensitive City, the envisioned new regime
aims to solve water problems, to adapt to future uncertainties (e.g. increase of extreme events), to create a more liveable urban
environment and to reflect the aspiration of the community related to water. Brussels-Capital Region (BCR) is a representative
case for experiencing a transition towards a WsC. This research explores the hypothesis of how alternative actions contribute to a
transition in the water regime in dense urban areas with a low level of water-related hazards by investigating different case
studies located in BCR. The capacity of alternative actions to trigger changes in the regime is conditioned by the processes that
produce them and by their influence on the emergence of subsequent actions. More specifically, the co-production of alternative actions
provides viable solutions to current challenges and sets the conditions for trying the principles of the new regime in a
particular context. The new stormwater management regime that favours this process relies on an adaptable infrastructure, as well as a
different type of practice of who plans, designs, constructs and manages this new infrastructure, and how.