TOOLS / RAINWATER HARVESTING
What could your roof collect?
Estimate the theoretical amount of rainfall you could collect across a year. This is a learning tool, not a guarantee of usable water.
ILLUSTRATIVE ANNUAL POTENTIAL
33,600
litres per year
With these assumptions, your roof has a theoretical collection potential of 33,600 litres in a year.
What this number does not tell you.
Seasonal availability
Rain may fall when your tank is full, followed by long dry spells.
Tank capacity
Annual capture does not tell you how much water can be stored between rain events.
Water quality
Roof water may contain pollutants or microorganisms. Intended uses require suitable treatment and checks.
Real-world losses
Overflow, first flush, gutters, evaporation, leaks and maintenance all matter.
SMALL STEPS / REAL CARE
Every thriving system
starts somewhere.
Start with the space, time and resources you already have.