The most comprehensive book on how current affects fly fishing, the good
and bad of drag, which casts and techniques to use when, and much
moreNymph fishing and accounting for variations in current speed at
different depthsHow even small movements of water can change your fly's
movement, and what to do about itThe effects of turbulence on water
temperature and oxygen contentHow mayflies, stoneflies, and midges are
affected by the water in which they liveTrout's evolutionary and
day-to-day responses to currentFishing drop-offs, midstream
obstructions, and sweepers