OK....here goes!!
During the summer of 2004 we were planning to move to our new land and I was going to put in a pond for my koi (It was going to be another watergarden.....I didn't know anything then

). We had a backhoe at the house, so I had them rough-dig the hole for me.
I went to the Charlotte koi show in November 2004 and for the first time in my life, I saw **REAL** koi. Up to that point, I didn't even know koi got big. When I came home, I started pouring over every internet board and koi pond book I could find and came up with a workable plan.
The walls are dry-stacked block. Because of the nature of my soil (sand/clay mix), I decided not to put in a footer. I probably should have, but didn't. The earth is very stable and the first course of block was laid on previously undisturbed soil. I didnt have a transit so I pulled two strings across the hole and leveled them with two line-levels. I set the first four blocks directly below the strings and then worked the blocks in between to create a level base. After all courses were set, I drove re-bar down thru some of the cells and backfilled the entire wall with concrete. I mixed the concrete in an ancient Sears concrete mixer and dumped it in thru a wooden chute I made that covered 3 cells at a time. Then I covered the wall with carpet to protect the liner from the rough blocks.