Hello all, I am glad that I found this site for there are many very experienced anglers who are willing to share knowledge with people. I am new to drift fishing. I have a few technical questions. How to determine the weight of the slinky/pencil lead? I would guess that it may depend on stream flow rate and depth of water, but what are the practical rules to quickly adjust it in the field? My second question is how to determine the length of leader with respect water color/visibility, temperature, flow rate, possible fish position/activity? TIA.