I need to build a wall to prevent erosion at the edge of a small stream in the backyard. It needs to be about 5' high on one side and run about 40' in length. I am not very handy and would like to obtain info on how to construct it and what materials to use. Normally the water is only a few inches deep but erosion occurs on the high bank when heavy rains come. I would prefer to be able to build with interlocking blocks and not use forms or concrete. Thank you for any help or direction you can provide. I live in the Atlanta, GA area.