FLORIDA GEOLOGICAL SURVEY


are indications of the size and ability of the water-table aquifer to store and transmit water. Figure 11 is a graph of streainllow of Econfina Creek near Compass Lake for the period April 1 to May 7, 1963.




  30


  40
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           5       10       Is      20       25      30       5
                APRIL            1963                     MAY
Figure 11. Graph of streaxnflow of Econfina Creek near Compass Lake for the period April 1 to May 7, 1963.
The low-flow portion of this graph represents seepage from the watertable aquifer. The nearly flat slope of the low-flow portion of this graph, such as that immediately preceding the rise of April 30, shows that storage of water in the aquifer is sufficient to maintain the low flow for long periods of no rainfall.
   The secondary artesian aquifer which is present along the Gulf coast also provides for storage of water in the basin. This aquifer is saturated at all times, therefore the volume of water stored in it does not change. Water discharges from this aquifer to the Gulf and to wells. There is some exchange of water between this secondary artesian aquifer and the aquifers above and below.
   The Floridan aquifer is the most extensive aquifer in the basin and the one from which most water is obtained. A more detailed study was made of the characteristic of this aquifer.
                 AQUIFER CHARACTERISTICS
    Certain hydraulic features of aquifers are of prime importance to water-supply planners and developers. These hydraulic features, ob-