55 gallon food grade barrels from freecycle: $0. old hose, hose ends, and bungs from Home Depot <$10. The PVC elbow has a fine screen and is attached to one hole in the center barrel (I've moved it since this photo) and that feeds the other two. All sealed and up on a 3' retaining wall so they gravity feed anywhere in the back yard. Just 165 gallons.
We needed to replace the rain gutter anyway, so we are not counting the cost of that, but to extend an existing gutter, it would have cost about $50. PVC pipe or other low cost tubing could have been run from a standard down spout into the barrels, but that wouldn't have allowed the height of the barrels, and since you have to buy the stuff in fixed lengths, we ended up with more rain gutter than we needed, so we just had to buy one corner extra to get it over to the fence and into place for the down spout right over the barrels.
But actually, to look at it literally, that water is worth about nothing. At a rate of less than $5 per thousand gallons at the very most, that 165 gallons of rain water is worth far less than $1. This ultra low cost catchment might pay for itself in a year or two.
That's why spending $100 or even $1000 on rain water catchment the way the "greenwashers" want you to do. It sooooo isn't worth doing. Sustainablility = Frugality over Time. If it doesn't save money, it isn't freking green. Period.
A much better way to collect and store rain water is with a Swale. Swales^ are areas that collect rain and other water so that it has time to seep into the ground instead of running off.
It turns out that swales can allow an enormous amount of water to be absorbed by the earth and retained for trees and other deep root plants. ^ And they don't have to look bad, because they can be hidden below mulch. The mulch will sop up the water and hold it safely. It won't attract mosquitoes or bad bacteria and will prevent it from evaporating.
Digging out the swale "ponds." The water will collect in those spaces after running off the lawn and the roof during rain storms. Or if someone accidentally leaves the hose on... :ahem:
Adding old logs to provide stepping "stones" to walk over and to provide a home for microorganisms and to act as a sponge.
It's hard to see how deep that is, but there is quite a bit of volumn for water to build up.
Top bed filled in around the stumps. Fine mulch in the bottom bed.
Finished project. The red edging bricks in the foreground will be replaced with nicer stepping stones.
2014/02/28 During the heavy rain of the last two days (in a drought year, after months of no rain) the rain barrels filled within a few hours of the first day. And that despite being fed by only one roof surface... probably 1/4 of the total roof area. On the other hand, the swales in the front, including a new HUGE swale located above and to the right of the large rock in the swales pictured above, have still not overflowed! And they are fed ALL the water from my more than 2,000 square foot roof.
Water is pouring off of my neighbors front yards into the storm drains, but there is NO water leaving my property. It's all being captured, soaking into the ground, and being held in the "sponge" of mulch filling my swales. Instead of 165 gallons for $10, or $1 a gallon for larger system, I'm collecting thousands of gallons for nothing more than the effort required to dig, reshape the land, and pick up free mulch from the city.
Now, in all fairness, a lot of that collected water is going to seep down into the earth, and eventually trickle down into the water table; I won't get ALL of it back during the dry spell that will certainly follow. But the mulch does sponge up a lot, and at a much lower price / gallon (almost zero). And it releases it automatically into the soil around each swale. And I'm feeding the water table, and saving the cities already overtaxed storm water system the extra load of processing that water. +
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