I stood watching the water for several minutes and there were a few sporadic rises up and down the length of the flat. I decided to concentrate on the top half of the flat hoping that as the twilight deepened that the bigger fish would move up out of the deeper water and feed in the shallower water nearer the riffle. The lower part of the flat is deep and the bottom is soft making wading a challenge. I prefer not to wade in that type of water when I am alone. [I like to think that I have become wiser but perhaps it's just because I'm old.]