An Evaluation Of Flood Management Benefits Through Floodplain Rstoration On The Willamette River Oregon U S A
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An Evaluation Of Flood Management Benefits Through Floodplain Rstoration On The Willamette River Oregon U S A
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Author : Kevin G. Coulton
language : en
Publisher:
Release Date : 1996
An Evaluation Of Flood Management Benefits Through Floodplain Rstoration On The Willamette River Oregon U S A written by Kevin G. Coulton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Flood control categories.
Willamette River Floodplain Restoration Oregon
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Author : United States. Office of the Assistant Secretary of the Army (Civil Works)
language : en
Publisher:
Release Date : 2014
Willamette River Floodplain Restoration Oregon written by United States. Office of the Assistant Secretary of the Army (Civil Works) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Environmental impact analysis categories.
Optimizing Reservoir Operations To Adapt To 21st Century Expectations Of Climate And Social Change In The Willamette River Basin Oregon
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Author : Kathleen M. Moore
language : en
Publisher:
Release Date : 2015
Optimizing Reservoir Operations To Adapt To 21st Century Expectations Of Climate And Social Change In The Willamette River Basin Oregon written by Kathleen M. Moore and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Cities and towns categories.
Reservoir systems in the western US are managed to serve two main competing purposes: to reduce flooding during the winter and spring, and to provide water supply for multiple uses during the summer. Because the storage capacity of a reservoir cannot be used for both flood damage reduction and water storage at the same time, these two uses are traded off as the reservoir fills during the transition from the wet to the dry season. Climate change, population growth, and development in the western US may exacerbate dry season water scarcity and increase winter flood risk, creating a need to critically evaluate the status quo for reservoir operations. Focusing on a system of thirteen reservoirs (the Willamette Project) in the Willamette River Basin, Oregon, we estimated the values of reservoir management for reducing expected damages in the floodplain and for storing water for recreation in and around the reservoirs. We then used these values in a dynamic program to estimate the optimal fill path over the winter-spring transition period for both historical conditions and future scenarios of climate and social change. The value of stored water for summertime reservoir recreation was estimated based on the response of recreational use day counts to variation in water levels at nine of the reservoirs over the period 2001 to 2011. Visitor days were found to decline by as much as 2% per foot of drop in water level below full pool. The implied value of water to recreational users varied from $0.10 to $78 per acre-foot per month, depending on the reservoir. This range of values is comparable to prior estimates of the value of reservoir recreation in other parts of the western US, and is also similar to the value of water to irrigated agriculture in the Willamette River Basin, estimated in other studies. Because water cannot be used for recreation and irrigation at the same time, these results suggest that management of the Willamette reservoirs may benefit society by releasing stored water in summer for downstream needs from some reservoirs, while maintaining full pool for recreation in others, as prescribed currently. The expected value of flood damage reduction was estimated based on the probability of floods, flood inundation depth, and reservoir capacity, for three scenarios of future development in the Willamette River Basin, which were simulated by the Willamette Water 2100 land transition model over the period from present to 2100 using mid-range projections of future climate (MIROC5) and assumptions about future population growth. Estimates of expected flood damage reduction varied as a function of flood risk over the course of the winter and spring, as well as the rate of population growth and associated development in the floodplain. At a weekly time scale the expected benefits of flood damage reduction ranged from a high in mid-January of $304 million to $1,284 million (depending on the rate of population growth), to near zero at the end of May. Finally, these analyses were combined in a dynamic programming approach to evaluate the optimal rate of fill for the Willamette Project reservoirs, at a weekly time step over the period from January to the end of May. This was done by treating the system of thirteen reservoirs as a single reservoir. The dynamic program found the fill path that minimized the sum of flood damages and foregone recreation benefits, subject to the constraint of available water inflows to the reservoir system. The estimated optimal fill path depended on the rate of decline of expected flood damages from mid-January to May. Anticipated future increases in winter flood risk and reduced spring streamflow, associated with climate change, shifted the optimal fill path to begin earlier and to fill more slowly, compared to the optimal fill path under historical conditions. The model confirms the intuitive result that the greater the value of stored water the earlier the optimal date to begin filling. Conversely, the greater the expected value of flood damage reduction the later the initiation of fill. Despite uncertainties in the estimated values of expected flood damage reduction and stored water for recreation, as well as the limitations of the dynamic program in modelling the coordinated management of multiple reservoirs, the approach and findings of this analysis contribute to our understanding of how reservoir management may need to adapt to future changes in water supply and demand.
Economic Analysis Of Restoration Practices To Improve Water Quality And Fish Habitat Of A Large River Floodplain
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Author : Saichon Seedang
language : en
Publisher:
Release Date : 2004
Economic Analysis Of Restoration Practices To Improve Water Quality And Fish Habitat Of A Large River Floodplain written by Saichon Seedang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Ecosystem management categories.
In- stream water temperature is one of the most important environmental factors associated with the decline in salmonid populations and their habitats in the Pacific Northwest. Most ecological restoration practices that attempt to reduce instream temperatures center on replanting or reestablishing riparian vegetation and increasing flows. However, in a large floodplain river like the Willamette, restoring hyporheic flow may also play an important role in reducing water temperature. The objective of this dissertation is to examine restoration practices that focus on the reduction of water temperatures in the upper mainstem Willamette River, Oregon, for the benefit of salmonid species. Economic information is developed to determine the cost-effectiveness of water temperature reduction strategies. The CEQUAL- W2 water temperature model is used to simulate the effects of upstream combinations of riparian shading and flow increments on downstream water temperatures. Costs associated with these strategies are estimated. These costs consist of the opportunity costs of losing agricultural production, and losing recreation due to flow releases from up-stream reservoirs. The effectiveness of each strategy in reducing water temperature and the associated costs are used to construct a cost-effectiveness frontier. The results indicate that the cumulative effects of shading and flows have little impact on temperature reduction downstream. Even when maximum available resources are allocated to investments in shade and flow increases they cannot lower summer water temperatures sufficiently to meet the state water temperature standard. However, the restoration practices selected from the cost-effectiveness frontiers method do provide ranges of achievable temperature reductions at minimum costs. These results are thus useful management tools when selecting policies to pursue water temperature goals. Hyporheic temperature reduction is also examined. Restoration practices associated with this type of cooling are done through removal/reconnection of the obstacles that are necessary to allow the process of re-creating dynamic channel complexity. The observed significant reduction of summer water temperatures associated with channel complexity indicates that this approach is more flexible in reducing temperature than approaches that rely on flow increments or/and shade. Although the costs associated with the hyporheic approach are substantial, the effects of such a long-term ecological improvement of floodplain habitat may substantially benefit salmonid populations.
Willamette Basin Land Use Study Flood Plain Management Policy In The Willamette Basin
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Author : Oregon. Planning and Development Division (1963-1967)
language : en
Publisher:
Release Date : 1965
Willamette Basin Land Use Study Flood Plain Management Policy In The Willamette Basin written by Oregon. Planning and Development Division (1963-1967) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Regional planning categories.
Willamette River Floodplain Restoration Oregon
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Author : United States. Office of the Assistant Secretary of the Army (Civil Works)
language : en
Publisher:
Release Date : 2014
Willamette River Floodplain Restoration Oregon written by United States. Office of the Assistant Secretary of the Army (Civil Works) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Environmental impact analysis categories.
Flood Plain Information
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Author : United States. Army. Corps of Engineers. Portland District
language : en
Publisher:
Release Date : 1971
Flood Plain Information written by United States. Army. Corps of Engineers. Portland District and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Flood control categories.
Review Plan
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Author : United States. Army. Corps of Engineers. Portland District
language : en
Publisher:
Release Date : 2012
Review Plan written by United States. Army. Corps of Engineers. Portland District and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Fishes categories.
Willamette River Basin Oregon Bank Protection And Channel Improvement
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Author : United States. Army. Corps of Engineers
language : en
Publisher:
Release Date : 1964
Willamette River Basin Oregon Bank Protection And Channel Improvement written by United States. Army. Corps of Engineers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Flood control categories.
Applying Ecological Principles To Land Management
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Author : Virginia H. Dale
language : en
Publisher: Springer Science & Business Media
Release Date : 2011-06-27
Applying Ecological Principles To Land Management written by Virginia H. Dale and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-06-27 with Science categories.
This volume incorporates case studies that explore past and current land use decisions on both public and private lands, and includes practical approaches and tools for land use decision-making. The most important feature of the book is the linking of ecological theory and principle with applied land use decision-making. The theoretical and empirical are joined through concrete case studies of actual land use decision-making processes.