Dave W., yes you may use the pictures for anything you like.
The rope is nothing more than floating Poly rope that I bought at Home Depot I think, 100 feet for about $6. I put 1000 nylon cable ties on the rope, $15. Took me 4 hours. After I trap all the DW at the edge of the pond I scoop it out with a long handled net. Took my about 2 hours to do the whole pond by myself. Goes twice as fast if you have help. Still involves some work. Trialsguy, we don't have WM in Minnesota. Don't think it would work with WM since there are no hanging roots like DW. This is a viable method for a small pond but will work with a larger pond if you have a small bay that the DW can blow into when the wind it right. My pond is 1/2 acre but the section you see in the pics is only about 1/4 of the whole thing and about 120 feet across. The rest of my pond is some distance away to the south but connected with a 15 foot wide channel. Whenever I get a south wind all DW blows into the small section of pond and once I clean that section the whole pond is done. That's what I did the day I took the pics. The wind brought the DW into the small pond and 2 hours later the whole thing is done. Unfortunately with all the heat we've had this summer I've been doing this every two weeks.