My rainwater collection system in prototype:

Last edited Mon Feb 18, 2013, 09:32 AM - Edit history (1)

Last summer I put together a prototype of a rainwater collection system for our garden. I put the rain gutters on an old shed & lean-to because that was the building closest to the garden. Because I didn't want to be carrying the water around in buckets, I built a little water tower to give me enough pressure to use a hose.

I fill the water tower with a little 12-volt pump designed for use in RV's. The pump runs off a 12 volt marine battery that is in turn charged by a 15 watt solar panel. I just use a garden hose with the pump in line to fill the tower. It only pumps a couple of gallons per minute, so it can take a half hour to fill the water tower, but since I only need to fill the tower 1 or 2 times a week, even in a drought, this is no problem. I made sure I got a pump that will not be damaged if I should happen to let it run dry for a little while.

The system is now in winter mode, drained and with the tanks covered. A friend told me that the plastic in tanks like that big cube is light-sensitive & deteriorates if exposed to too much sunlight, so I will probably build a plywood shell over it in the spring. It's currently under a tarp.

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The water tower near the end of construction



The water collection tanks. The square one is about 275 gallons & plumbed in series with the 55 gal. drum. There is an overflow tube out of the top bunghole of the drum.


The pump & battery. The battery is in a marine battery case.



This is the Amazon pic of the solar panel & converter. I have it but the end of the growing season came before I got it installed, so I have no original pics of it.

http://www.amazon.com/Sunforce-50033-15-Watt-Solar-Charging/dp/B001RJOP5Y/ref=sr_1_2?ie=UTF8&qid=1353945874&sr=8-2&keywords=solar+panels