Water year 2011 (October 1, 2010, through September 30, 2011) was a year of hydrologic drought (based on streamflow) in Oklahoma and the second-driest year to date (based on precipitation) since 1925. Drought conditions worsened substantially in the summe
Shivers, Molly J. mshivers@usgs.gov,Andrews, William J. wandrews@usgs.gov. Hydrologic drought of water year 2011 compared to four major drought periods of the 20th century in Oklahoma. 2013-01-01.