These were used as heavy weights for laminating foam to plywood, but have many other uses like temporary weights for tents, displays, swap meet booths, mudslide control, or their original use for laminating materials where clamps are impractical. They weigh about 75 to 80 lbs. and can be moved by two men with a bar thru the eyebolts. 48" long X 8 1/2" wide x 5 3/4" high
Extra Heavy Weighted Car Stops w/ Eyebolts could be converted with plywood. (Photos are mock-up for visualization) Slanted plywood version; By running rebar thru the eyebolts to support plywood at an angle the runoff debris would weigh down the leading edge of the plywood making the invention heavier and less likely to move. 48" long X 8 1/2" wide x 5 3/4" high
Version with upright plywood uses strong steel cables around 2X4's thru the eyebolts with the several stops perpendicular to the wood. (In photos steel cables replace cord.)
Both versions are strong as the materials used. Thicker the plywood & steel cables the stronger barrier will be, same with the number of weight/bolts used. THIS IS EXPERIMENTAL, AND NO GUARENTEE OR RESPONSIBILITY IS OFFERED. But it seems pretty certain it would help, and economically as well.
Or just use them as a base, or spine for a sand bag barrier, OR any think you'd like to try.
These have lots of added concrete, made much heavier than regular car stops (@$35 w/ no eyebolts). I have 12 available, (minimum order is 3). 3 could support a 16' long barrier about/over about 20" high. Contingent on you purchasing the rebar, and sheets of plywood, and some bolts, and assembly and installation,