A canal edge with a pedestrian path and city buildings
Pexels contributor
Pexels contributor
05 / Adaptation

Rooms for rain

Turning courtyards, canals, and roofs into an urban sponge.

The central idea

Rain needs a room

Water always finds a route. The question is whether the city provides a safe place to hold, filter, use, and return it.

Modern building with a green roof under a blue sky
Mohamed B. / Pexels

Roofs and canal edges become part of a distributed retention system. — Mohamed B. / Pexels · Mohamed B. / Pexels

The fastest drain is not always the best answer; sometimes a city needs to learn how to hold.
Editorial note
Numbers to begin with

From roof to ground

10 mm
of first rainfall held close to its source
4 steps
hold, filter, use, and then release
1 block
a practical scale for a first prototype
Field lens

Roofs and canal edges become part of a distributed retention system.

01
Hold rain close to where it lands.
02
Filter it through planting and soil.
03
Reuse it before releasing it.