Rain Water Statistics
1 inch of rainfall on a 2,000 square foot residential home's roof
Generates 1,250 gallons of water
A basic calculation is .559 gallons per square foot of roof for 1 inch of rain
The home above, located in Southeastern Pennsylvania (near Philadelphia) experiences an average of 45 inches of rainfall each year.
A rain catchment system on the roof would generate 55,000 gallons of water each year.
The average roof collects 600 gallons of water for each inch of rain that falls on it.
Rain Water Harvesting
Rain Catchment Is Good For You
And for the Environment
Manage Overflow to the Advantage of the Environment
Arizona has some of the most arid areas in the USA. Plan wisely and even there you can gather enough water to sustain yourself, even better than that if you plan conservation. A 2000 square foot roof will yield approximately 1,250 gallons of rainwater from 1" of rain.
You must plan for overflow. Properly managed a rainwater catchment system can rapidly exceed any storage capacitiy that you have created very rapidly in most areas. Creating a diverse and dense biocover in the path of the overflow allows for the water to be absorbed and positively impact the area.
Rain in drylands generally runs off leaving no positive effect on the soil, foliage or environment.
Catchement basins and marsh areas allow water to stand and slowly perculate into the ground increasing the water table (level of ground water).
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