The ground where we decided to put a 14ft x 48 in intex pool was on a slope, so I dug out (by hand) the high side to be even with the lowest side. After setting the pool up, the water still runs downhill by about 2-3 inches. I have already took the pool down and re-dug twice, all with a level. Still runs downhill. Can't afford any fancy levels like a transit. Any ideas?