In recent years I have been re-reading some books on the topic of fishing the chalk streams and the limestone creeks (UK and USA respectively), and my attention was drawn to why these places were and are, such universities of flyfishing thought. It relates to the fact that with the slow flow, unruffled surface, consistent water temperature, and clean water, they get regular and to some degree predicable hatches. It also relates to the fact that fish don’t have to expend a lot of energy to swim forward or up, to sip a miniscule fly. Added to that, the water