posted 1 year ago
Hi Angel,
I have not installed a catchment system before, so I can't answer specifics, but two things come to mind.
First, what climate are you in? Does it freeze in your area? This will affect the advice given.
Second, measure your house/roof to get an idea of how much water you will get at one time. A way to estimate your roof size is to take 1.5 times the size of your square footage. So for a 20 by 30 house (600sqft), your roof is probably in the range of 900sqft. Watercache.com gives a formula of (sqft of roof area x precipitation amount x .623) to get gallons. Lets say you get 1 inch of rain on that 900sqft roof. If you captured all of it, you would have 587 gallons of water. It goes to show how unrealistic those 30 gallon rainwater barrels are :). Lastly look at the average rainfall for your area to get an idea of how much storage you may need.
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