Hi Patricia, that sounds like one of those 'rules of thumb' that can't necessarily be relied upon. There are a lot of factors to consider when burying or partially burying a water tank including the hydrostatic pressure (if you have a high water table there is a change the tank could float right out of the hole when empty), soil pressure which could distort your tank etc. I guess the first question I would ask you is 'why a 30,000L tank?'. Are you diverting all of your downpipes? How much roof area to you have? There may be other space saving solutions that don't rely on you partially burying a tank. Happy to help if you want to send me an email or just reply here.

I believe the look you're after was a traditional flooring in French country gardens and suggest a similar effect could be acheived using the same method as for exposed aggregate paths and driveways ie the stones are mixed into concrete and spread out to create the floor (including drainage) that you need and then, before the concrete is properly dry the surface is rubbed with a stiff broom to expose the top of the stones and then sealed..Depending on how wide and thick you need the area of flooring a concretor could do this for you, or in a small area with solid existing concrete floor you could try sticking the stones down very closely together with a suitable tile glue, add a thick cement grout (to help hold the stones in place) and brush to reveal more of the stones to suit and seal.. check out "exposed aggregate paths" for specifics

Finished product! Glad I switched the rug the other direction, and the round table kind of plays off the circle window. Truly thankful for all your help! This was fun and I am so happy with the end result. :)

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