REPORT OF INVESTIGATIONs No. 41


the center of the well field. The cone of depression which had been developing in this field was clearly established by 1961.
   The maps of the Panama City area showing the piezometric surface of the Floridan aquifer, figures 13, 18, and 20, illustrate the effect of development of water from this aquifer. The piezometric surface in 1908 (fig. 18) is indicative of the general conditions in the area up to about 1930. By 1947 the 4 principal well fields were producing enough water to develop sizeable cones of depression in the piezometric sur-


Figure 20. Map showing the piezometric surface of the Floridan aquifer in the Panama City area in April 1947.

face (fig. 20). A comparison 6f piezometric surfaces in figures 13 and 20 clearly shows that increased pumping from expanded well fields has extended the cones of depression and has lowered water levels generally throughout the Panama City area during the period from 1947 to 1962.
                   THE DEADENING LAKES
   The Deadening is a group of lakes in the lower end of a closed creek basin 'in the southeastern corner of Washington County, as shown in figure 21. These lakes receive the surface drainage from the