1. Impact of 2006-2007 Drought on Jackson Blue Spring Kris Barrios Northwest Florida Water Management District

4. Rank Value Year Number of Days Missing Values 129.0919540 238.9219521 339.1519810 440.6619550 541.2419740 641.65194030 741.8319680 842.7620070 942.8619430 1044.23199962 1144.2120000 1245.1820060 1345.4619900 1446.0819620 1546.9619720 1647.14194110 1748.8319860 1849.02197631 1949.0819690 2049.1419710 PeriodRank Two-Year Cumulative Rainfall 1954-1955169.75 2006-2007287.94 1999-2000388.44 1940-1941488.79 1951-1952589.66 1968-1969690.91 1980-1981791.34 1967-1968893.71 1953-1954995.68 1971-19721096.1 1955-19561197.36 1939-19401299.14 1942-19431399.69 1957-195814102.24 1950-195115102.39 1981-198216103.42 1966-196717103.43 1976-197718103.76 1941-194219103.97 1985-198620104.31 Historic Rainfall Amounts – Annual and Biennial Record Lows

5. 30-Year Normal Annual Rainfall Total = 58.24 inches

6. On June 5, 2007 the NWFWMD responded with a water shortage warning: Order 07-001, Issuance of a Water Shortage Warning within the NWFWMD “All users in all classes are encouraged to reduce water use and to conserve water to the maximum extent possible.”

7. In May 2006, both ground water level and spring discharge drop below average.

8. Measurements conducted by Karst Environmental Services

9. Jackson Blue Spring Basin Refinement - 2007 The previous basin delineation used topographic elevation values with +/-5-foot accuracy resulting in 10-foot contours. The spring basin refinement used LiDAR (Light Detection And Ranging) elevation data with 0.5- foot accuracy. NWFWMD Staff collected water elevation data from 79 wells. The refinement increased the resolution of the Floridan Aquifer surface contours to 2 feet. water level measurement

11. LiDAR Elevation Detail Sinkholes Karst Depressions

13. Long term predictions indicate severe drought conditions ahead for the next few months to several years………..

14. For more information on the springs of Merritt’s Mill Pond: NWFWMD Technical File Report 07-01: Merritt’s Mill Pond Spring Vent Characterization Questions?