Excerpt from Response of Migrating Adult Salmonids to Vertical and Horizontal Rectangular Orifices at Two Depths The position and type of entrance used to attract migrating fish into fishways can be important factors in expediting the movement of fish at dams. A key part of fish-facility complexes at most hydro-electric plants on the Columbia River is the powerhouse fish collection system, a long channel extending across the face of the powerhouse and con taining a number of entrances for fish. This channel is one of several routes to the main fishways. To enter the powerhouse collection channel, however, migrants attracted by the turbine discharge must locate entrance ports above the turbine draft tubes. Large dis charges from fishway entrances also attract numerous migrants directly to the entrances of the main fish ladders. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.