How much water do I need?
This depends on how much rain you get in your part of the country. Arizona gets .7 in per month on average. California about an 1.5. Places like Georgia, New York, and WI get about 4, 3.3, and 2.6 inches of rain a month. This number varies tremendously depending on season, drought, and flooding. Never the less, this means that on a 1000 square foot roof and 1 inch of rain you have the potential to catch 623 gallons. In Arizona you could catch almost 430 gallons a month and in Georgia you could keep nearly 2492 gallons.
Now you must decide how much plant life and how much water you intend to use for other uses, like washing your car or flushing your toilets. An average household of 4 can use around 12,000 gallons a month for bathing, cooking, washing, recreation and watering. Outdoor use could account for as much as 40% of the monthly usage. The best use for unfiltered, but soft distilled water is for outside use on plants, gardens and washing your car.
So the answer is, as much as possible, but saving any amount will help you get through a drought, local water restrictions or power outages and the chance of scarce or a complete lack of water. With this in mind consider the RainReserve multiple rain barrel system. You decide how much you want to start off with, be it 55 gallons per downspout or 1000 gallons per downspout. The RainReserve is a diverter and barrel system that allows 1 or 2 tanks to be filled in parallel. If you wanted to save more water, the Daisy Chain Kit can be added and allows for limitless expansion or additional systems could be added to multiple rain barrels on downspouts around the house. |