FLORIDA GEOLOGICAL SURVEY


streams in the Big Coldwater Creek basin have perennial flows. The
average flow from the basin is estimated to be 542 cfs, of which 517 cfs
come from the drainage area within Santa Rosa County.
 The unit runoff of East Fork and West Fork, the two main tributaries
of Big Coldwater Creek, is slightly lower than that of the main creek.
The unit runoff from the upper 64 square miles of East Fork is 2.0 cfs
per square mile; that from the upper 39.5 square miles of West Fork is
1.9 cfs per square mile; and that from the 237 square miles above State


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 s0
30


VALLEY DISTANCE ABOVE MOUTH,


IN MILES


 Figure 29. Channel-bottom profile of Pond Creek.


Highway 191, below the confluence of the two forks, is 2.2 cfs per square
mile. The intervening drainage area of 133.5 square miles between the
two gaging stations on the forks and the gaging station on State High-
way 191 has a unit runoff of 2.5 cfs per square mile. About 60 percent
of the flow of West Fork Coldwater Creek is base flow and 40 percent
is direct runoff from overland flow.
 Streamflow records have been collected for 23 years (1938-61) on
Big Coldwater Creek. The gaging station near Milton is located on State
Highway 191 and measures flow from 237 square miles. The flow-dura-


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02-4--62
0 2 4 6 a 10 12 14 is is 20 22 24 ef


3