Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?

Leak detection

Noticing a leak, and being able to stop it. A slow leak wastes a stored supply quietly; a burst one empties it in an afternoon. The options differ in whether a person has to be there to close a valve or the system closes it by itself.

Solutions

• Manual isolation valves at key points: Lets a leak or failure be isolated to one section rather than shutting off the whole system.
• Automatic smart leak-detection shut-off valve: A motorised valve on the main water pipe with a sensor that learns the household’s normal use. When it detects water running when it should not, from a burst pi