Threats to western riparian areas due to water withdrawals and other causes. Information at http://wrrc.arizona.edu/sites/wrrc.arizona.edu/files/JAWRA_Threats%20to%20Riparian%20Ecosystems%20in%20Western%20North%20America.pdf
Land subsidence due to water withdrawals. Information at http://ga.water.usgs.gov/edu/earthgwlandsubside.html and http://wrrc.arizona.edu/sites/wrrc.arizona.edu/files/USGS_Land%20Subsidence%20in%20the%20United%20States.PDF
Groundwater depletion across the nation. http://wrrc.arizona.edu/sites/wrrc.arizona.edu/files/USGS_Groundwater%20Depletion%20Across%20the%20Nation.pdf