One inch of rain is equal to 27,154 gallons per 1 acre. South Florida has an annual precipitation of 61.3 inches per year. That is an average of 1million 600+ gallons a year for our lawns. Our sprinkler systems use 12 gallons per minute. This works out to 2160 gallons of water a week for 3 hours of sprinkling, with an average of 112,000 gallons a year per household. Most the lawns in South Florida are over watered. Using Sustainable Sprinklers patented smart system saves water, money and our drinking water.