REPORT OF INVESTIGATIONS No. 41


                        THOUSANDS OF FEET
      25   20    15    10    5     0     5     o 0  15   20   25


    50

W
W 00-         _       _50 Computations based onA

S200 T= 4OOgpd/ft.                                _          
        S = .0005

   250  _ __ _ __ __ 
Figure 15. Theoretical drawdowns along a line of 10 wells after 100 days of
         pumping at a rate of 200 gallons per minute at each well.

is established between the amount being pumped and the amount moving to the well, either through a decrease in natural discharge or an increase in natural recharge. Water-level records (p. 33) in the well field of the International Paper Company show that the cone of depression in that well field had stabilized by 1951 -as a result of controlled pumping.
                         WATER USE
   Water planners should know how much of the available water is being used and the areas from which it is taken. Oftentimes, the amount of water available in an aquifer is ascertained by determining how much is being withdrawn and by measuring the effects of this withdrawal on the water levels in the aquifer. For example, the low water levels in the Floridan aquifer prior to February 1964 were near the level where dewatering of the aquifer would begin near the centers of heavy pumping.
   The major uses of water within the Econfina Creek basin are recreation, manufacture of paper products, and public and domestic supplies. An undetermined though relatively small amount is used for irrigation. More than 80 named lakes, inland bays that cover over 100 square miles, and the larger streams are used for recreation.
   Information was collected on the various municipal and industrial uses of water within the basin, except recreation, in order to estimate the total amount being withdrawn. Data on principal water-supply systems are given in table 2.