REPORT OF INVESTIGATIONS NO. 48


Figure 1.-Location of Lake Jackson.


limit of the gage. During these periods monthly measurements of
the water level were obtained from an auxiliary staff gage. The
monthly hydrograph for Lake Jackson is shown by figure 2. Figure
3 shows for the period of record the per cent of time that the
lake was at or above a particular level.

 RAINFALL

 Rainfall has not been measured at Lake Jackson but rainfall
at, or near, Tallahassee has been recorded since 1886. The
average yearly rainfall for Tallahassee for all years of record
through 1965 is 57.32 inches. The variation in annual rainfall at
Tallahassee is shown by figure 4.
 Rainfall at Quincy, Florida and Monticello, Florida (fig. 1)
 has been recorded since 1917 and 1906, respectively; however, the
 record for Monticello is incomplete for several years prior to 1920.
 The long-term average of yearly rainfall for all years of complete
 record through 1965 is 55.33 inches for Quincy and 56.82 inches
 for Monticello. Figure 5 compares the cumulative yearly rainfall
 at Tallahassee with that at both Quincy and Monticello. In each