Download or read book Trends in Streamflow Above and Below Dams Across the Columbia River Basin from 1950 to 2012 written by John Christophe Hammond and published by . This book was released on 2014 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt: Climate change, combined with population growth, is expected to exacerbate water scarcity globally. In the Columbia River basin (CRB), streamflow is managed for multiple objectives with a network of dams and reservoirs distributed throughout the basin that may mitigate climate change effects on water scarcity. This study quantified trends in daily streamflow from 1950-2012 in 28 pairs of gages above and below dams in the CRB, including the U.S. and Canada. Each gage pair consisted of an above-dam gage that is primarily forested and has little apparent human disturbance and minimal flow regulation or diversions, combined with a below-dam gage immediately downstream of a major dam and reservoir. Monthly streamflow and precipitation for a total of 59 sites was correlated with monthly indices of the Pacific Decadal Oscillation (PDO), the Northern Pacific Index (NPI), the Pacific North America pattern (PNA), and the 700-millibar wind speeds (u700) using Pearson's r. Long-term trends and patterns in daily streamflow and climate data were estimated using linear regression, the Mann-Kendall test, and wavelet analysis. Streamflow was generally weakly correlated with NPI, PNA, and PDO, while positively correlated with upper elevation wind speed at low elevations during wet months. Fewer than half of above-dam gages in the CRB have experienced increasing trends in daily streamflow from mid-March to the beginning of May over the period 1950 to 2012, whereas a majority has experienced decreasing trends from the middle of May to the middle of October. These trends in above-dam basins are consistent with trends expected from climate change, but they also may be affected by legacies of past forest harvest or wildfire. Below dams, reservoir management appears to have overwritten the signal of earlier snowmelt, except in the Boise sub-basin, but long-term declines in late summer flows were evident at half of below-dam sites. Declining summer flows below dams were attributable to a variety of factors, including changes in reservoir management as well as reservoir management that propagates signals from above dam catchments, such as climate change or forest-harvest legacy effects on streamflow. There have been very few significant changes in annual flow volume throughout the basin, and these streamflow trends represent a small percentage of annual flow volume; thus, observed trends appear to be shifts in timing rather than shifts in the annual water balance. The magnitude of 60-yr declines in late summer flow in above-dam catchments represents only a few percent of annual yield, and much less than the storage capacity of the dams, but these long-term changes may be quite important for water yield during the late summer low-flow period. These findings are relevant for strategies to adaptively manage water resources in light of the ongoing planning for renegotiation of the U.S.-Canada Columbia River Treaty.
Download or read book Where the River Flows written by Sean W. Fleming and published by Princeton University Press. This book was released on 2019-08-06 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rivers are essential to every aspect of civilization, yet how many understand how they work? Fleming takes readers on a journey along our planet's waterways, providing a scientist's reflections on the profound interrelationships that rivers have with landscapes, ecosystems, and societies.
Download or read book 1980 Level Modified Streamflow 1928 1978 written by and published by . This book was released on 1983 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Managing the Columbia River written by National Research Council and published by National Academies Press. This book was released on 2004-08-27 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flows of the Columbia River, although modified substantially during the twentieth century, still vary considerably between seasons and between years. Lowest flows tend to occur during summer months when demand for irrigation water is at its highest and when water temperatures are greatest. These periods of low flows, high demand, and high temperature are critical periods for juvenile salmon migrating downstream through the Columbia River hydropower system. Although impacts on salmon of any individual water withdrawal may be small, the cumulative effects of numerous withdrawals will affect Columbia River flows and would pose increased risks to salmon survival. The body of scientific knowledge explaining salmon migratory behavior and physiology is substantial, but imperfect, and decision makers should acknowledge this and be willing to take action in the face of uncertainties. In order to provide a more comprehensive water permitting process, the State of Washington, Canada, other basin states, and tribal groups should establish a basin-wide forum to consider future water withdrawal application permits. If the State of Washington issues additional permits for water withdrawals from the Columbia River, those permits should contain provisions that allow withdrawals to be curtailed during critical high-demand periods.
Download or read book Climatology of the Interior Columbia River Basin written by Sue A. Ferguson and published by . This book was released on 1999 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Columbia River Basin written by United States. Congress. Senate. Committee on Interior and Insular Affairs and published by . This book was released on 1950 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: Considers (81) H.R. 5472.
Download or read book Water Quality of the Lower Columbia River Basin written by and published by . This book was released on 1996 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report on Streamflow Depletion Columbia River Basin written by Columbia Basin Inter-Agency Committee. Water Management Subcommittee and published by . This book was released on 1957 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Columbia River Basin Project for Water Supply and Water Quality Management written by United States. Public Health Service and published by . This book was released on 1961 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report on Determination of Historical Flows at Selected Power Sites Columbia River Basin written by Columbia Basin Inter-Agency Committee. Water Management Subcommittee and published by . This book was released on 1956 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Commentary on Columbia River Instream Flows written by Howard D. Copp and published by . This book was released on 1983 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Snow Surveys and Irrigation Water Forecasts for Columbia River Basin written by Agricultural Engineering Bureau and published by . This book was released on 1939 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A River in Common written by John M. Volkman and published by . This book was released on 1997 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: Report to the Western Water Policy Review Advisory Commission.
Download or read book Columbia River and Its Tributaries written by United States. Congress. House. Committee on Irrigation and Reclamation and published by . This book was released on 1943 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Adjusted Streamflow and Storage 1928 1978 written by and published by . This book was released on 1981 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Columbia River Basin written by United States. Bureau of Reclamation and published by . This book was released on 1949 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Navigation and Flood Control on the Columbia River and Its Tributaries written by United States. Congress. Senate. Committee on Agriculture and Forestry and published by . This book was released on 1936 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
