flow could be recovered from the fluorescent record, based on the period 1961 - 1986. 
When the model was tested on a validation sample (known SRS flow for 1940 - 1960), 
approximately 45% of the interannual variation was explained. The fluorescence record 
showed a sustained, marked decline which began about 1912 and ended around 1931. 
Fluorescence is significantly higher (P < 0.001) early in the record (pre 1932) than 
late in the record (1932 and later). Based on the significant relationship between 
fluorescence and SRS flow, this decrease is interpreted as recording decreased 
freshwater flow from the Everglades into Florida Bay and adjacent waters, perhaps by 
as much as 59%. The onset of decreased flow corresponded with the timing of 
construction of the extensive network of drainage canals to the east and south of Lake 
Okeechobee. These canals diverted water into the Atlantic Ocean which would normally 
have flowed into the Everglades from Lake Okeechobee. 
1895 - 1989 
Hanson, K., and G. A. Maul (1991) Florida precipitation and the Pacific El Nino, 1895-1989. 
Fla. Sci. . 54(3/4): 160-8. 
This study identifies rainfall anomalies, timed with major El Nino events, in seven 
climatic divisions of Florida. The study also determines the statistical significance of 
these rainfall anomalies. The seasonal and annual climatology of rainfall is presented 
for seven climatic divisions of the state for the period 1895 to 1989. Periodogram 
analysis indicates 5 to 6 yr variability in rainfall throughout most of Florida, in 
particular during winter and spring. Super-posed epoch analysis, utilizing only rainfall 
during the year prior to and concurrent with a major El Nino, shows that state-wide 
rainfall anomalies are timed with these Pacific events. The most significant anomalies 
are: (1) below normal rainfall over all of the state during winter and spring the second 
year of an El Nino; and (2) above normal rainfall over all of the state during winter and 
spring the second year of an El Nino. Largest rainfall anomalies have occurred in the 
southern climatic divisions of Florida. During winters of the second year of El Nino 
south Florida rainfall anomalies range from +76 to +94 mm (+3.0 to +3.7 in) depending 
on the climatic division. These anomalies are 45 to 66 percent above normal winter 
rainfall, and are significant at the 0.999 level. 
1905 - 1976 
DeGrove, J. M. (1983) History of water management in South Florida. In: Environments of 
South Florida: Present and Past II. P. J. Gleason (ed.). Miami Geological Society, Coral 
Gables, FL. 22-7. 
This paper describes the history of water management in South Florida from early 
efforts to secure federal assistance for the project during 1845 to 1850 to legislation 
passed in 1975 and 1976. 
1908 
Vaughan, T. W. (1910) A contribution to the geological history of peninsular Florida. 
Carnegie Inst. Publ. 133. Carnegie Institution, Washington, DC. 185 pp. 
This citation describes the geological history of the Florida Plateau as of 1910. The 
work contains descriptions of sampling expeditions to Florida Bay, the Florida Keys, 
Biscayne Bay, Card Sound, Barnes Sound, Blackwater Sound, Hoodoo Sound and the 
Bahamas in 1908 to collect sediment samples. The samples were found to be mostly 
silica and "carbonate of lime" (CaC0 3 ). Silica was abundant in the form of sand in the 
northern portion of Biscayne Bay, becoming rarer toward the southwest. It was 
present in small quantities as far as Big Pine Key. Towards the southwest, as the 
siliceous material became rarer, calcium carbonate became progressively more 
abundant, occurring as a flocculent sediment or ooze over practically the entire region 
from the lower portion of Biscayne Bay to the gulf end of Florida Bay. 
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