The two walls adjacent to the southeast corner of my basement are bulging. The distance of the bulge extends 15+/- feet in each direction. I'm guessing the bulge may be out of plumb an average of 1" to 2". We buildt the house 24 years ago. At the time I had the contractor backfill around the foundation with gravel "to the top." I'm certain that wasn't done because I've installed a french drain down at least a foot after noticing the bulge a few years ago. I encountered no gravel. The soil is heavy clay and nearly flat around the house. I understand the importance of removing surface water. In searching the web I find there are a number of methods to address the problem; from excavating and rebuilding the wall carbon fiber reinforcement. My objective is to stabilize the wall as is with a reasonable degree of certainty and least cost. I appreciate all thoughts before contacting local contractors.