42 FLORIDA GEOLOGICAL SURVEY

cfs and the peak flow on the same day was 24,800 cfs-over 2% times
greater.
 The flow-duration curve for Pine Barren Creek given in figure 15
shows the percent of time a specified discharge has been equaled or
exceeded. For example, the mean daily flows at the gaging station were


CHANNEL DISTANCE ABOVE SOUTH, IN MILES


 Figure 24. Channel-bottom profile of Pine Barren Creek.


greater than 67 cfs (43 mgd) for 98 percent of the time. If an industry
needs a water supply of 43 mgd, a deficiency 2 percent of the time might
be tolerated if it were uniformly distributed, with only a few days of
deficient flow in any continuous period. A deficient flow of 2 percent of
the time, on the other hand, could prove disastrous if it came in a con-
tinuous period of several months duration.
 The data given in figure 25 are helpful in determining probability
of length of periods of deficient flow. The lowest average flow for a
specified period can be determined from the lower curve in figure 25.


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