On 9/12/2015 6:26 AM, Don Y wrote:

2000G is roughly 250 cubic feet. So, 5x5x10, 4x6x10, 3x8x10, etc.

We're not keen on digging a *deep* hole (removing 30 yards of soil is
not a trivial undertaking!) so the form factor would be closer to
3 deep x 8 wide x 10 long -- or thereabouts.

how do you get from 250 cubic feet to 30 yards?

Math error. 2000G displace 267 cu ft. A sample 2000G tank (chosen randomly)
displaces 378 cu ft and has a footprint of 86 sq ft. Assume you put 2 ft of
soil atop the tank means another 172 cu ft (2*86) of soil. So, 550 cu ft
of soil, assuming you don't have to *shade* the underside of the tank in any
way *or* move any other soil to get water *into* and out of the tank.

Actually, it's more like 720 cu ft (the 172 cu ft covering the tank has to be
REMOVED to put the tank in place, then REPLACED once it's been sited).
So, around 26 cu yds (i.e., my "30" shirt cuff estimate was within ~10%)