REPORT OF INVESTIGATIONS NO. 42


 The net ground-water outflow (U) thus computed from the
Floridan aquifer for the.eastern and western basins for November
1959 and May 1962 are presented in table 13. About 80 percent
of the outflow from the western area originated from rainfall
within the basin; the remaining 20 percent was inflow from the
eastern basin. All outflow from the eastern area originated from
rainfall within the basin. More than half of the total amount of
ground water leaving the eastern basin flows to the Kissimmee
River basin. The mean annual ground-water outflows from the
eastern and western basins for the years 1959 and 1960 are assumed
to be the same as those shown in table 13 for November 1959.
The mean annual values for 1961 are assumed to be averages
between the values for the two periods in table 13. Mean annual
ground-water outflows thus computed for the 3 years are
summarized in table 14.
 Annual changes in the amount of ground water in storage in
the nonartesian aquifer were determined for the period 1959-61.
The net change in storage for the years 1959 and 1960 is negligible.
However, the net loss in water from storage during 1961 amounted
to about 7.4 inches in the eastern basin and about 2 inches in the
western basin. These storage losses add to precipitation as a source
of supply in the water-budget equation.
 Coefficients of storage of the artesian Floridan aquifer are
small (table 10). Therefore, changes in ground-water storage
during the period 1959-60 were insignificant quantities. During
1961, the net decrease of the piezometric surface was about 2 feet,
which is equivalent to a loss of about 0.2 inch of water from the
basins. This is an insignificant budget factor. Thus, change in
storage shown in table 14 was computed for only the nonartesian
aquifer.
 Comparative results of the annual water-budget for the eastern
 and western basins are summarized in table 14.

 OUTFLOW FROM GREEN SWAMP AREA
 The total surface runoff from 818 square miles, which includes
 most (94 percent) of the Green Swamp area, was measured at each
 of the five major outlets. Listed in table 15 are the mean monthly
 discharges determined at each of these outlets from the beginning
 of the investigation in July 1958 to June 1962.
 Table 15 shows the distribution of total discharge from month
 to month as well as that from the individual streams draining from
 the area. The effects of wet and dry years on the amount and


109