Most River Flows across the U.S. are Altered by Land and Water Management, Leading to Ecological Degradation (the full report can be gotten by clicking on the appropriate link in the press release)
This isn't very surprising, but it's good (in a research-descriptive way, not in an ecologically sound way) to see it quantified.
Two quotes from the press release illustrate the theme of this research publication:
“This USGS assessment provides the most geographically extensive analysis to date of stream flow alteration,” said Bill Werkheiser, USGS Associate Director for Water. “Findings show the pervasiveness of stream flow alteration resulting from land and water management, the significant impact of altered stream flow on aquatic organisms, and the importance of considering this factor for sustaining and restoring the health of the Nation's streams and ecosystems."
“Management practices related to water demand continue to alter stream flows in many places,” said Jeff Ostermiller, Water Quality Manager with the Utah Division of Water Quality. “Understanding the ecological effects of these flow alterations helps water managers develop effective strategies to ensure that water remains sufficiently clean and abundant to support fisheries and recreation opportunities, while simultaneously supporting economic development.”
Annual and seasonal cycles of water flows — particularly the low and high flows — shape ecological processes in rivers and streams. An adequate minimum flow is important to maintain suitable water conditions and habitat for fish and other aquatic life. High flows are important because they replenish floodplains and flush out accumulated sediment that can degrade habitat.
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