REPORT OF INVESTIGATIONS No. 40


 The Moore Creek watershed covers 32 square miles in Santa Rosa
County. The flow from this creek enters the Escambia River just up-
stream from Pine Barren Creek. The yield from this basin is estimated to
be approximately the same as Pine Barren Creek basin, about 29 inches
per year. Average flow from the basin is estimated to be 67 cfs.
 Canoe Creek lies mostly within Escambia County, Florida, with its
headwaters in Alabama-24 square miles in Florida and 13 square miles
in Alabama. The channel bed is lined with sand and gravel, and the
banks are steep and heavily wooded. Based on a field observation of the
physical characteristics of Canoe Creek basin, it appears that the flow
characteristics are similar to those of Pine Barren Creek. An average
flow of 78 cfs for Canoe Creek is obtained by multiplying the drainage
area by the unit runoff of 2.1 cfs per square mile for Pine Barren Creek.
 The drainage area of the Escambia River at the Century gaging
station is 3,817 square miles. The river above the Century gaging station
is called the Conecuh River in Alabama. Its basin is slightly elongated
in shape, with the longer axis lying in a northeast-southwest direction.
The Conecuh River is located along the southern edge of the basin. All
of its large tributaries have their headwaters along the northern edge of
the basin and flow southward to the Conecuh River.
 The seasonal distribution of flow at the Century gaging station, al-
 though from a large area located in Alabama, follows a pattern similar
 to that of the smaller nearby streams in Florida. The bar graph in figure
 27 shows the seasonal distribution of flows for a 27-year period at the
 gaging station at State Highway 4 near Century. The highest average
 flows occur in March and April and the lowest flows occur in September,
 October, and November. The variation 'of flows for any month can be
 great. January has the greatest variation of monthly mean flows, varying
 from a low of 1,900 cfs to a maximum of 31,500 cfs. October has the low-
 est variation of monthly mean flows ranging from 666 cfs to 7,530 cfs.
 Some streamflow characteristics for the 27-year period of record at
 the Century gaging station are indicated by the flow-duration curve in
 figure 17. Based on the flow-duration curve, the flow has been below
 1,000 cfs (646 mgd) for only 3 percent of the time. The maximum flow
 during the 27-year period ending in 1961 was 77,200 cfs, and the mini-
 mum flow recorded was 600 cfs (388 mgd). The computed peak dis-
 charge for the flood of March 1929 was 315,000 cfs. The elevation of this
 flood peak was 66.1 feet above sea level which was 4.5 feet above the
 floor of the bridge. Regional flood-frequency curves for the Escambia
 River basin are given in figure 20.
 The average yield per unit area from the Escambia River basin ap-


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