Rainwater is a good source of water, if you are lucky enough to live in a climate with regular rainfall or a disaster occurs during the rainy season. One inch of rainfall equates to 27,000 gallons of water falling on 1 acre of land.
Rain falls on roofs too, and if you catch the rain in containers, it is possible to quickly collect water.
To calculate the amount of rain that falls on your roof, just use the following equation:
.6 gallons of water per inch of rain per square foot of roof X roof square footage = rainfall amount For example, a 2,000 square foot roof would produce 1,200 gallons of water that could potentially be collected. This is water that can be used for:
- Washing dishes
Rainfall can be directed into a 55 gallon drum using gutters and downspouts.