Pocket water is where the river cascades into broken white pools, places where the water swirls drifts and eddies into tiny smooth pools, broken by rocks and boulders scattered all over the river and cause pockets of short water all around them. The water tends to move in all directions. Pocket water is easy to distinguish from other sections of the river because it has an almost whitewater rapids appearance. It is not easy water to read or fish. When you are going to fish pocket water, the harder it is to get to a spot, the better the fishing will usually be when you get there.
Start at the back of the pocket run and work your way to the front. Target one current break at a time, such as a large rock, and fish it until you are satisfied that the fish will no longer bite. I love targeting pockets with large Wruff flies before deep nymphing.