That's a very common method of fishing moving water. Especially, with a nymph setup, but dries too.I worked out a little system where I would let the line run downstream below me and I would lift the line out of the water and toss it straight upstream. This allowed me to work straight upstream but I was very limited in what direction I could cast. It also meant that my fly would come straight down the river toward me and it ended up hooked in my waders more than once. I tried casting low to get under the wind but this wind was so strong that even down low it blew my rig all over the place and my cast was turned back on itself. I think there are some days where fly fishing just isn't in the cards. This was one of them.