Useful websites...

• How much water can I collect from my roof?
  Use these calculations to work out how much rainwater you can harvest from your roof.
• What is your water footprint?
  Use this great step by step calculator to work out how much water your household is really using. There are lots of water saving tips on the site as well...
• Rainwater harvesting and permaculture
  The website of Brad Lancaster, author of Rainwater Harvesting for Dry Lands and Beyond. Full of information on harvesting and using rainwater.