FLORIDA GEOLOGICAL SURVEY


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  Figuare 22 Geohydrologic sections through the WVhite Oak Creek basin,
                  southeastern Washington County.

shown by the graphs in figure 23. The similarity of the graphs of lake and ground-water levels indicates hydrologic continuity between the lakes and the aquifer.
   Flow from White Oak Creek enters Swindle Swamp and separates, part going to Porter Lake and parL going to Still Pond through Black Slough (fig. 21). The flow from Still Pond is to Hamlin Pond by way of subsurface channels. These subsurface channels are evidenced by sink holes through which movement of water can be seen. Hanilin Pond overflows to Hammock Lake. Wages Pond receives surface drainage from Howard Swamp and overflows to Gully Pond. Hammock Lake and Gully Pond are at a lower stage than the other lakes because they receive surface flow only when the other lakes overflow.
   A comparison of the recessions of lake levels to the expected evaporational losses indicates the lakes lose water to the underlying Floridan aquifer. The level of Clarks Hole, an arm of Hamlin Pond, receded seven feet from August to December 1962. Below a stage of 55 feet, Clarks Hole is separated from Hamlin Pond and the shore line is below the line of vegetation, which eliminates most transpirational losses. The major water losses from Clarks Hole below a stage of 55 feet are evaporation and downward leakage. During the 5-month period that water levels in Clarks Hole declined seven feet, the evaporational loss was about 2 feet, based on pan evaporation records