REPORT OF INVESTIGATIONS NO. 42


60









 Note Total runoff adjusted
 for change in storage in
 lakes and swamps above
30 --- gaging station.



f0


0


15 20 25


 Annual runoff, in inches
 Figure 49. Relation of effective annual rainfall and annual runoff,
 Palatlakaha Creek above Mascotte, 1946-61.

water flows from eastern basins than from western basins (table
14). The gain in streamflow by ground-water pumpage at Dade
City reduces the apparent water loss in the Withlacoochee River
basin above Trilby. The many large lakes and swamps in the upper
Palatlakaha Creek basin afford the opportunity for high evapo-
transpiration losses. The differences in ground-water inflows and
outflows in the Palatlakaha Creek and Withlacoochee River basins
and the increased evapotranspiration losses from the large lakes
and swamps could easily account for the 3 inches more potential
natural loss from the Palatlakaha Creek basin.

 WATER-BUDGET STUDIES

 A water budget is a quantitive statement of the balance between
the total water gains and losses of a basin or area for a period of
time. The budget considers all waters, surface and subsurface,
entering and leaving or stored within a basin. Water entering a