Then you start to pull things off with exclusion lists. In other words, I know Red Tail Creek, say, in Saskatchewan only trickles during a large rain, and yes, during that rain it could probably support a canoe, but nobody is going to travel 600 miles to get to Red Tail Creek to float the canoe for the two hours it trickles enough water to float it. Very specifically, on the exclusion list, there's no need to apply Red Tail Creek, and that's your “no need to apply” list.
You could also put “no need to apply” on that list with certain portions of waterways. I don't think anybody is going to build a dock in the middle of the Deschênes Rapids out here or have a swim raft out there, but we can very specifically say “no need to apply” because there's no navigation on the Deschênes Rapids. I'm using that as an example.