From Composters.com:
Residential irrigation can account for 40% of domestic water consumption in a given municipality. Rain barrels not only store water, they help decrease demand during the sweltering summer months. Only 1/4 inch of rainfall runoff from the average roof will completely fill the typical barrel. Collection of water from rooftop runoff can provide an ample supply of this free 'soft water' containing no chlorine, lime or calcium. Because it tends to have fewer sediments and dissolved salts than municipal water, rain water is ideal for a multitude of applications, including biodynamic and organic vegetable gardens, raised planter beds for botanicals, indoor tropicals like ferns and orchids, automobile washing, and cleaning household windows. Saving water in this manner will reduce you demand for treated tap water, and save money by lowering your monthly bill. Rain water diversion will also help decrease the burden on water treatment facilities and municipal drainage systems during storms. The storage of rain water is also recommended for general emergency preparedness, or for areas prone to disasters or drought.
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