Hi', McTrout.
As Stuart rightly says, water levels are mainly of interest to sea trout and salmon anglers. Sea trout fishing by day is generally better when rivers have a good flow, and some of the slower salmon beats only fish well when the river is running at two foot and more above the summer zero level.
Little streams almost invariably fish best when carrying a nice clearing water, or a little colour, while the main effect in the larger rivers is to make them more difficult to cover. Low water in such rivers may concentrate fish in the pools and deeper flats and glides, and they will not be as widely spread out, generally.
Riffles may well be too shallow to attract fish during a hatch unless they have good holding gullies, pots, weedbeds etc.
Good luck with your fishing. TerryC
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