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Recent studies of past climate and streamflow conditions have broadened understanding of long-term water availability in the Colorado River, revealing many periods when streamflow was lower than at any time in the past 100 years of recorded flows. That information, along with two important trends-a rapid increase in urban populations in the West and significant climate warming in the region-will require that water managers prepare for possible reductions in water supplies that cannot be fully averted through traditional means. Colorado River Basin Water Management assesses existing scientific information, including temperature and streamflow records, tree-ring based reconstructions, and climate model projections, and how it relates to Colorado River water supplies and demands, water management, and drought preparedness. The book concludes that successful adjustments to new conditions will entail strong and sustained cooperation among the seven Colorado River basin states and recommends conducting a comprehensive basinwide study of urban water practices that can be used to help improve planning for future droughts and water shortages.
Recent studies of past climate and streamflow conditions have broadened understanding of long-term water availability in the Colorado River, revealing many periods when streamflow was lower than at any time in the past 100 years of recorded flows. That information, along with two important trends-a rapid increase in urban populations in the West and significant climate warming in the region-will require that water managers prepare for possible reductions in water supplies that cannot be fully averted through traditional means. Colorado River Basin Water Management assesses existing scientific information, including temperature and streamflow records, tree-ring based reconstructions, and climate model projections, and how it relates to Colorado River water supplies and demands, water management, and drought preparedness. The book concludes that successful adjustments to new conditions will entail strong and sustained cooperation among the seven Colorado River basin states and recommends conducting a comprehensive basinwide study of urban water practices that can be used to help improve planning for future droughts and water shortages.
Sustained drought in the Upper Colorado River Basin allowed native and nonnative plant species to colonize low-lying bar surfaces within the last five years. The effects of this vegetation at bar and reach scales were assessed by combining a 2-dimensional hydraulic model with models for rigid and flexible vegetation developed by Smith (2001; 2006). Modeling results showed that the vegetation characterized in 2005 produced the greatest reduction in velocity and shear stress (15% and 35% respectively) at flows equal to 28% of bankfull discharge. At the highest flow modeled (76% of bankfull discharge) the vegetation produced almost no change in velocity, but reduced the bed shear stress by 11%. While local effects on the bar were pronounced, overall flow patterns were not greatly changed in the reach. Additional model results simulating future growth of vegetation indicate significant increases in shear stress in the main channel, which could cause channel change.