WATER RESOURCES OF ORANGE COUNTY 65
o 6,000
,000 "
00
a 400
(I IZOO ...-UJ
z
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0.5 2 5 I0 20 30 40 50 60 70 80 90 95 9 99 995 99.9 99.99
PERCENT OF TIME SPECIFIC CONDUCTANCE WAS EQUALED OR EXCEEDED
Figure 29. Cumulative frequency curve of specific conductance of the
Econlockhatchee River near Bithlo, October, 1959 May, 1962.
from October 1959 to May 1962. Figure 30 shows the relation of specific conductance to hardness and mineral content for the Econlockhatchee River near Bithlo. Hardness and mineral content were the only properties of the water that could be related to the specific conductance for the Econlockhatchee River. The sodium, chloride, and sulfate content is usually very low. By using figure 29 in conjunction with figure 30, the percentage of time that hardness and mineral content would exceed a given value can be estimated.
Little Econlockhatchee River
The Little Econlockhatchee River drains 71 square miles of Orange County east of Orlando. Altitudes in this basin range from about 35 feet near the county line to 127 feet at the eastern edge of Orlando. Figure 27 shows a profile of the bed of the Little Econlockhatchee River.
A few lakes exist along the western rim of the basin but none exist elsewhere. Many swamps and marshes temporarily store water and thereby reduce the magnitude of peak flows in the river.