Mon Dieu!
I turn my back to actually get some work done and a brainstorm breaks out!
And not to worry about thread hijack. This is more about getting some general thoughts on the situation and wild ideas are welcome. We can get complacent about the idea that we always keep our eyes on the little ones, but I work in the network and computer security field and we believe in layers of protection.

Thanks for the ideas. Actually I had plastic snow fencing on my mind (for other reasons) but I'm also concerned about entanglement. Borrowing from what's already serving a similar purpose I think of baby cribs and deck/stair railings with their vertical members (no wider than 4"). It would lend itself to rolling, or telescoping for removal/storage. Made out of PVC, it would probably be pretty light and withstand the water pretty well.


Hmmm...