Rainwater catchment concept

A followup post on how to collect rainwater for use.  It is a series within a series, within a series, you might say.  Here's the list of posts so far:

1. Home again, 6/30/15
2. Obligatory, 7/1/15
3. Modified quonset with pool inside

and this one.

The use of concrete cloth has given me an idea to use it for building tanks under the quonsets.  The rainwater would drain directly into them.

Build the tanks around the edges of the quonset.  If it is 24 feet by 16 feet, then it would be maybe 2.5 feet wide, by 6 inches deep, by 16 feet long.  Two of these would hold about 300 gallons.  Not big enough to catch all the water that could be collected, so it may need to get a lot bigger, somehow.

On second thought, I could make the quonset smaller, and then connect four of them into the quadrangle concept.  This quadrangle would be fairly large, as each side would be 23 feet.  Counting the width of 8 feet of each quonset, it could be 39 feet across.  Total area of rain catchment would equal nearly 1600 square feet.  Lots of potential to capture beaucoup water, mon frère.

Now the whole kit and caboodle can go into the water subseries.

Update:

Not 1600 square feet.  It took awhile for me to puzzle out why the number doesn't come up to that amount because the square isn't a perfect square, it leaves out sections at each corner.  The actual square footage could be about 1200, but I'm not sure.  Still, it's plenty big.

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