Step 2: Roof Size
Insert the collection area in square metres (NB. This is the roof area only and not surface/driveways etc.) As a guide, you can measure the surface area of your overall floor plan for your house. (W x D = roof size).
Presumption of smooth pitched roof with a surface yield coefficient of 0.9.
Tip: The average UK roof size is 100 m2 (1076 ft2).
m2 ft.2 Step 3: Rainfall
Please enter your postcode so that we can estimate the rainfall for your area.
Calculation based on filter coefficient of 95% and sized based on an 18-day dry period.
Estimated Rainfall mm
Step 4: Number of people
Please select the number of people living in your household.
Step 5: Rainwater Use
What will you use your collected rainwater for?
