There really is no way to predict what the ground will do when you put 30-50,000 gallons on top of it. In the case of the Bina family in Texas, they miscalculated the ground and the side verticals dug into the ground causing the pool to bow out. Fortunately for them, they bought an EZ Pool which is design to support 3-4 inches being out of level. Our frame and vinyl is so strong, it can actually support 5 times its weight. We did everything for you to make swimming EZ.