REPORT OF INVESTIGATIONS NO. 42


the peak for Hillsborough. River near Tampa was on March 21.
The flood peak at the Tampa station occurred about two days later
than that at the Withlacoochee-Hillsborough overflow and about 3
days later than that at the Zephyrhills station.
 The gaging station near Tampa is in the upper pool at the
waterworks dam. In March 1960, the stage of the upper pool was
regulated between narrow limits by tainter gates and flashboards.
A stage-discharge relation was defined at 22nd Street, 0.5 mile
downstream from the dam, by measurements made during the
floods of 1959 and 1960. Mean daily discharges for the gaging
station at the dam were used with the stage-discharge relation to
compute the stage hydrograph for 22nd Street as shown in
figure 56.
 | o __________________ ___ __ ^ ^ ^ -________


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 10


 EXPLANATION

 Mean daolly stage at 22nd Street computed
 from mean daily discharge at gaging
 6 station 0.5 mile upstream.

 Mean daily stage at 22nd Street inferred
 from discharges at gaging station adjusted
 4 for no flow ot Withlacoochee- Hillsborough
 overflow.


 S 1 1 1 1 I I I I I


17 18 19 20


21 .-22 23 24 '25 26 27 28
 March 1960


29 30 31


Hydrographs of computed mean daily stage of Hillsborough River
 at 22nd Street,-Tampa, flood-of March 1960.


 16


Figure 56.