People have been harvesting rainwater for thousands of years, and some of the same techniques that were used back then are still used today.
Rainwater harvesting is a key element to being totally self-sufficient, and even though other techniques and sources for procuring water should be utilized, it would be a waste to see water pour from the sky on rainy days with no means in place to catch it.
Following are four proven methods for harvesting rainwater. You can use one of them or all of them at once, but each one has been successful in its own right:
1. Rooftop catchment. This method dates back to the earliest times and may have been the original water harvesting method. There are many variations of this method, but essentially, containers are placed on the edges of roofs to collect the water. To catch the most water, use roofs that are slanted for the water to slide into the gutters, from which it can then be guided into a large container or barrel. To ensure cleaner water, clean your gutters before it rains, install a filter system in the containers, or boil and filter your water elsewhere after collecting it.