Bruce, Attached is an article in CE News about a Contech product that could be a possible solution for erosion just downstream of the limestone boulders. I am open to other solutions as well, but I do think we need something to transition from the limestone boulders to the natural turf. Please have look at it and let me know what you think. Thanks, Clay Barnett, P.E. Town Engineer Town of Addison 16801 Westgrove Drive Addison, TX 75001-2818 Office: (972) 450-2857