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Rain Harvesting - Tank Calculators

Via, a single, or multiple, downpipe system. Measure the length and width of the plan area of the building and assess which downpipes collect this rainwater to the location of the storage tank.

Tick box for area of country you live in for annual rainfall:

Region Average annual rainfall  
1316mm
846mm
938mm
692mm
1368mm
833mm

www.metoffice.gov.uk/climate/uk/2007/annual/averages1.html
www.weatherstations.co.uk/aws_map.htm

Roof profile

Tank sizing for drought protection

Plant area watered visit RHS for guidance

www.rhs.org.uk/advice/profiles0406/water.asp