
High water can have a significant impact on dry fly fishing. The heavier surface tensions of higher flows can deter trout from feeding on the surface even during a solid hatch. Fish may be positioned in different areas of a pool or run than under normal flows. Trout will often search out softer flows along seam lines or tail outs. Collection points where multiple seams converge can create a concentration of bugs that allow a trout to feed heavily balancing the extra energy required to counteract the substantial flows.