The slope of the ravine behind my house is eroding and I need to stop it. The current plan is to build a 3 foot high by 30 foot long retaining wall near the bottom, fill it with soil, and plant some kind of soil binding plant on it (crown vetch maybe?).
The problem is the wall. I just had a contractor come by who wants to drive a number 3" x 8' foot steel pipes 5 feet into the ground and put a 3/8 steel wall up against them. That would last a long time, but I'm not real keen on the idea. The terrain and accessibility make a poured concrete wall or anything that requires a foundation out of the question.
Treated wood that will last any length of time is illegal to use so near the creek.
Anybody have any other ideas?
Lookng down the slope. It's a about a 45 to 50 degree pitch.
This is a cross section of the slope. Black is the soil level, red is the wall, green is fill, blue is the creek. The foundation of the slope is limestone of varying strengths. Some is kind of soft and punky and some is hard as ... well, a rock.