[Greenbuilding] Grain Bin as Water Storage

[Mike Forbes]

Hi all,
firing off lots of questions lately and here's the latest.

i'm trying to augment my 6000 gal of rainwater storage with another 10-20
thousand more gallons for irrigation needs.  In searching for large capacity
water storage I found that a corrugated grain bin with a pond liner
inside (1500+ bushel) is the most cost effective and can be a long term good
storage option.

What I find when researching this is a couple of Canadian articles stating
that grain is lighter than water and therefore having an engineer perform a
structural analysis on the tank to see if it'll hold water is recommended.
Does anyone on this list have any experience with this or have
recommendations on large water storage that is affordable (<$2000 for 10k
gallons).

thanks again in advance,
mike forbes
moscow, idaho