I have never seen a cistern in a basement, but I don't get out much. I suppose they were common in some areas?
Ask your neighbors. Ask a local contractor. Then there's the peanut gallery: like me.
If it didn't need to be flush to the surrounding floor, I would just build a square 6' x 6' floor/wall section out of pt 2x4 on 16" centers, deck it with treated cdx, add some brackets to keep it centered over the hole, and call it good.
If it needed to be flush to the top of the surrounding floor, I would be inclined towards steel. I would ask a metal guy/shop to size the materials and build it.
Does it need a hatch?
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.