What can you do?

Right now I am just looking for creative suggestions! If you have any links that would be very helpful too. Later I may need people to volunteer time, or donate unwanted materials. Right now I am thinking of building a very large half circle wall up to the line or higher, filling it with rocks and soil and then planting it with shrubs that would help filter. If you know of any plants that help do this please let me know! Thanks!