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The premise for flow augmentation is based on the argument that increasing water velocity increases smolt migration speed, which in turn improves smolt survival through reservoirs and at ocean entry. The purpose of this document is to examine key technical issues regarding the benefits of flow augmentation as a strategy for improving survival of downstream migrants. Reservoir drawdown, an altemative strategy for increasing water velocity through the mainstream Snake and Columbia rivers will also be examined. Data sets and analyses that pertain to Snake River stocks will be emphasized, particularly those stocks currently listed as threatened or endangered. This document focuses on treating two smolt responses that can be useful in reflecting the effects of flow augmentation, or increased water velocity; travel time or migration speed, and survival. Although there has been recent interest in using migrational timing as a measure of flow effects that response reflects principally the temporal initiation of the migration event and does not provide a performance measure once fish are in transit between two locations.
Return to the River will describe a new ecosystem-based approach to the restoration of salmon and steelhead populations in the Columbia River, once one of the most productive river basins for anadromous salmonids on the west coast of North America. The approach of this work has broad applicability to all recovery efforts throughout the northern hemisphere and general applicability to fisheries and aquatic restoration efforts throughout the world. The Pacific Northwest is now embroiled in a major public policy debate over the management and restoration of Pacific salmon. The outcome of the debate has the potential to affect major segments of the region's economy - river transportation, hydroelectric production, irrigated agriculture, urban growth, commercial and sport fisheries, etc. This debate, centered as it is on the salmon in all the rivers, has created a huge demand for information. The book will be a powerful addition to that debate. A 15 year collaboration by a diverse group of scientists working on the management and recovery of salmon, steelhead trout, and wildlife populations in the Pacific Northwest Includes over 200 figures, with four-color throughout the book Discusses complex issues such as habitat degradation, juvenile survival through the hydrosystem, the role of artificial production, and harvest reform