FLORIDA GEOLOGICAL. SURVEY


collected at Woodruff Dam by the U. S. Weather Bureau. The remnaining five feet represents leakage to the ground. Clarks Hole receive no inflow during this period. Some of the other lakes did, which minimizes the apparent losses shown by graphs in figure 23.
   The Deadening area received about 11 inches of rain in July 1963, of which 8 inches fell during the last 10 days of the month. These heavv rains caused moderate rises in the lake levels and the piezometric surface of the Floridan aquifer. The ground-water level and lake levels, in general, showed about the same amount of rise, from 2 to 5 feet. The water level in Clarks Hole rose about 12 feet as a result of overflow from Hamlin Pond.
   Water in the Floridan aquifer moves in the general direction of the slope of the piezometric surface (fig. 13). Water moves to the center of The Deadening area from the northeast, and moves radially from The Deadening area toward Econfina Creek to the southeast, the Gulf of Mexico to the south, and Pine Log Creek to the southwest.
   Wells in The Deadening area showed larger gains during the rise of July 1963 than wells outside the area. This indicated that the Floridan aquifer gains water indirectly from rainfall more rapidly in The Deadening, area than in the surrounding area.
   Water diverted to The Deadening lakes would move from the lakes to the Floridan aquifer at a rate proportional to the head between the lake surfaces and the piezometric surface of the aquifer. Raised lake levels could increase this head and cause more water to enter the aquifer. If the lake levels are maintained at a constant elevation. the head that will be established depends on the ability of the Floridan aquifer to transmit water away from the area.

                   FLOW OF ECONFINA CREEK
    Information on the flow of Econfina Creek was obtained to determnine the amount of water available at the proposed point of diversion and to determine what effect diversion would have on streamfiow.
    The proposed point of diversion is just east of the north end of Porter Lake, about midway of the basin. The drainage area of Econfina Creek above the proposed point of diversion is about 67 square miles. The average flow at this point was estimated to be 90 mgd.
    Minimum flow at the point of diversion is the important criterion in determining the available flow. The greatest amount of water will be needed in the lakes when the creek flow is lowest. A minimum flow of 30 mgd was estimated on the basis of three discharge measurements and the relation of these measurements to the long-term flow record at the Bennett gaging station. This minimum flow probably will