Methods of practice and guidelines for using survey-grade global navigation satellite systems (GNSS) to establish vertical datum in the United States Geological Survey: U.S. Geological Survey Techniques and Methods, book 11, chap. D1, 102 p. with appendixes.
In 2011, new record-low monthly discharge occurred at 52 of 113 streamgages that have 20 or more years of data. These 52 streamgages are located throughout Georgia. Most of the State received lower-than-normal precipitation; from central Georgia to Florida, the State received 50-75 percent of normal precipitation. Normal is defined as a 30-year average for 1971-2000. New record-low 7-day average discharge occurred at 24 of 113 streamgages that have 20 or more years of data in 2011. The majority of these streamgages were located in southern Georgia. These maps represent hydrologic conditions during the 2011 WY compared to available historical data. The colors represent runoff (flow per unit area) as a percentile of long-term averages. Runoff was calculated for each basin and assumed to be uniform over the entire basin area. Only streamflow stations with a complete daily-flow dataset for the 2011 WY were used (U.S. Geological Survey, 2012c). For the first quarter of the 2011 WY (October-December 2010), much of the State was observing "below normal" and "much below normal" runoff conditions as a result of extreme temperatures and lack of precipitation during the preceding summer months of the 2010 WY (A). Little to no precipitation kept the majority of the State in drought during the second and third quarter of the 2011 WY (B, C). After receiving 50-75 percent of normal precipitation from central Georgia to Florida during the 2011 WY, the majority of the State was in an extreme drought during the fourth quarter as runoff was "much below normal," and large areas of the State observed some of the lowest runoff conditions on record (D).
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