Collecting rain can ease your expenses: A 20,000-gallon systems will supply an average family for about 125 days. Here’s the math: “For every 100 square feet of roof, 1 inch of rain yields 60 to 100 gallons of water. So if you have a 1,000-square-foot roof, an inch of rain will give you 600 to 1,000 gallons. In places where the average annual rainfall is 12 inches of precipitation, it is possible to collect 10,000 gallons annually from a 1,500-square-foot residential roof or 700,000 gallons annually from a 100,000-square-foot commercial building, according to the American Rainwater Catchment Systems Association. Some rainwater harvesting opponents have argued that it slows flow to streams, ponds, lakes, rivers and even underground aquifers, but proponents say it eases pressure on other sources of water by managing stormwater runoff and even eliminating millions of gallons of accelerated runoffs that we have created with large buildings and steeply pitched roofs. We are creating a solution at Climate, Inc., Europeans have done this forever, as well as islanders and we want to continue to share the latest technologies with everyone.