Most of the remaining rivers in the Northern Hemisphere with significant hydroelectric power potential are northward flowing boreal rivers. In this book the downstream impacts on the riverine environment of damming such a river are investigated. The book describes a forty-year longitudinal study of the effects on river morphology and riparian vegetation communities of the regulation of Peace River, in northwestern Canada. When the initial dam was closed in 1967, this was the fifth largest project in the world. There is no precedent for such a longitudinal study of the downstream impact of a major hydroelectric power development anywhere in the world. Accordingly, this book will be of major interest for hydroelectric power developers and engineers, for environmentalists, and for river scientists. An online database of all the main observations will provide material for problem study by advanced students of river hydraulics and geomorphology. The 1200 km downstream river includes cobble-gravel, sandy gravel and sand-bed reaches, so the principal channel types are encompassed. Beginning with a description of the effect of regulation on the flow and sediment regimes of the river, it proceeds to study changes in downstream channel geometry, on the lower course of tributaries, and on the hydraulic geometry, the overall morphology of the channel, and riparian vegetation succession. The river is subject to annual freeze-up and break-up, so a chapter is devoted to the ice regime of the river. The penultimate chapter presents a prediction of the ultimate equilibrium form of the regulated river based on rational regime theory. A notable feature of this study is that, while the dams control the water flow in the river, most of the sediment supply to the river is delivered downstream of the dams, so the principal controlling factors of river channel form (water and sediment inputs) are conveniently separated, permitting an exceptional quasi-experimental opportunity to study the isolated effect of water control. Furthermore, a controlled release of water over eight weeks in 1996, after 27 years of regulated flow, created an approximation of a pre-regulation annual flood in the river, providing an opportunity to study the effect of such a flow in a regulated channel. In comparison, a major, natural flood occurred over several days in 1990, providing an exceptional opportunity to study the comparative effect of floods of high magnitude and greatly differing duration. Altogether, this study provides unprecedented insights into river dynamics as the result of the fortuitous distribution of water and sediment inputs and the history of flows. There is no precedent for a book on this theme, though there have been volumes and review papers that gather results from individual synoptic studies. The most recent such book, however, was published in 1984 (Petts, G. E., Impounded rivers: perspectives for ecological management, John Wiley and Sons, Chichester, 326pp.). There has since been much knowledge accumulated on downstream effects of dams which is summarized along with the new results in the proposed volume. The study was conducted on a large, northward flowing boreal river; a river type that represents most of the remaining hydroelectric power potential in the Northern Hemisphere. Hence the results will be of interest not only to river scientists but to the entire hydroelectric power development community, comprising developers, engineers and managers, as well as to concerned environmentalists. The authors assume that it will be a service to the interested community to publish the results in a single volume rather than in a sequence of scattered research papersThis book is far more than a case study. It carefully brings together a range of studies that have been previously inaccessible providing a rare and rather comprehensive analysis of the effects of a big dam on a river, a river that itself represents an example of the kind of system that is likely to receive considerable attention in the future from dam engineers and environmentalists.

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