Grass, We would have a couple of problems with a fishing line grid on the lakes. 1. We have a diver go into the lakes for golf balls and he is concerned about getting tangled up in the lines. 2. The owners and employees use the lakes for recreation.....fishing ect. 3. We wired the perimeter of the lakes and the golfers continuously tore down the wires, so our expectations would be the same for the fishing line grid. It became a time problem replacing and repairing the wires all the time.