The Añorga quarry in San Sebastián sits within a landscape shaped by water and hydraulic infrastructure — yet these systems are usually kept invisible, disconnected from daily life and the people around them. The quarry's heavy rainfall and its large impermeable surface, built for water to run across, are treated here as an opportunity rather than a constraint: the starting point for a large recreational infrastructure.

The project collects, treats, and reuses rainwater, understanding both the infrastructure and the water itself as a source of new programmes and spaces. It reactivates the quarry with water as its protagonist, running at different qualities and speeds through permeable, hydrophilic architectures that make the whole process visible rather than hidden.

That process becomes a sequence of spaces: ditches and filtering soil first collect the rainwater; a catenary roof, shaped by gravity and the weight of the water itself, gathers it further; transparent pipes, ramps, and helicoidal stairs trace its treatment in full view; and it finally arrives at a series of pools — some held within vaulted, cave-like concrete vessels, others left as natural pools that colonize the quarry floor, purified by gravel and plants in a small, self-sustaining hydraulic landscape.