REPORT OF INVESTIGATIONS No. 42


 600000


 400,000



a,
f aoopoo

- 200,000
0
0
ao


- 100,000




 50,000


100


200


500


1000


2000


 Drainage area, in square miles
 Figure 57. Relation between basin runoff and drainage area for
 Withlacoochee River, March 16 to April 20, 1960.


square miles at gaging station minus 394 square miles above the
two reservoirs).
 Peak discharges for the flood of March 1960 have been plotted
against drainage areas at gaging stations in the Withlacoochee
River basin as shown in figure 58. The peak discharge at
Withlacoochee-Hillsborough overflow was 1,880 cfs. From the
relation in figure 58, the drainage area that would produce a peak
discharge of 1,880 cfs for the March flood would be 100 square
miles. Effective drainage areas for the gaging stations downstream
from Withlacooche-Hillsborough overflow have been computed by
subtracting 100 square miles from the measured drainage areas of
each. The curve shown by the broken line in figure 58 represents
the theoretical relation of drainage areas to flood peaks that would
have prevailed if no flood discharge had been diverted from the
basin.


 Holder 0


 Croom
 Trilby




 Note:
 Runoff at Trilby,
 Croom, and Holder
 adjusted to include
 diversion from basin
 Rerdell through Withlacoochee-
 Hillsborough overflow.

- Eva I


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