Here is an examples of erosion control. The backyard on this house was sliding downt he hill. The two elements that needed to be overcome with this situation were water and weight. Our soulution was a combination of high tension tie-backs and a light weight structual fill. First, we removed the loose dirt from the bank and installed the tie backs this involves drilling holes into the hillside, inserting tie backs, filling the holes with a grout, then placing the tie-back beam. After the hill is secured with the tie back beams, the weight would be the greatest contributor to continued erosion. To combat that, we rebuilt the bank with styrafoam blocks. After they are in place and the hillside is backfilled, you wouldn't even know they were there and the hillside will stay on the hill.