(Continued from Part 1. This concludes the article.)
Our Primary Rainwater Capture System
When the time came for us to put in a new garage, we had the opportunity to install a larger rainwater system that could also capture snow melt, as well as store water during the winter.
The collection system is an in-ground French drain running the 60-foot length of the building, between the eaves of the building and the hillside. The drain empties into a 1,000-gallon concrete underground cistern. We put in a septic tank for the toilet in the garage, so we just dropped a second septic tank to use as a cistern for this system. We use a small Eco-Worthy 12 volt DC submersible pump, powered by a 100-watt PV solar panel, to retrieve the water. An alternative retrieval method we use is an inexpensive Milescraft 1314 transfer pump, powered by an electric drill, to suck the water the 8 feet from the bottom of the cistern.
(When choosing a solar panel and a pump, make sure that the panel is rated at the voltage and power that matches the requirements of the pump. This way, the panel may be wired directly to the pump without any charge controller.)
The interior of the cistern is coated with a waterproof sealant, as the concrete is porous and would otherwise only hold water for a limited time. We used BASF MasterSeal 583, which also fills cracks in addition to providing a durable seal. The cistern is next to outdoor raised beds, a greenhouse, and the cow pen. Our well-fed hydrant is also nearby, so we can use either the well water or the cistern water on the garden, greenhouse, and animals.Continue reading“Rainwater Harvesting – Part 2, by K.R.”
