Dry stack rock retainers are a perfect solution to problem, steep areas, curing erosion, diverting water, taming and leveling otherwise unmanageable land. This may be the best application of dry stack rock as it can drain easily without needing weep holes and pipes. Also it can move without breaking as it has less resistance to natural forces such as water. Note the angle of the wall rather than being vertical they lean back toward the mountain counter acting the weight of the earth and water bearing down hill.