257


Sources of the values are shown in footnotes to the tables.

Constants changed to reflect present and primitive

conditions are indicated.



Simulations

 Given in Figures 59 through 61 are monthly values for

the forcing function and important hydrologic parameters of

the system simulated on the digital computer under

primitive (predrainage) and present (postdrainage)

conditions for a 25-yr period. Figure 59A is a plot of

monthly rainfall over the study area based on recorded

rainfall at Ft. Myers from June 1950 through May 1975

(indicated year intervals are from June through May).

Figure 59B presents digital simulations of monthly runoff

and ET from the study region under predrainage and

postdrainage conditions. Runoff is higher and ET lower in

the postdrainage state. Simulations of monthly stages of

surface water (depth at the deepest local point) and

average depth of surface water over the entire surface

water area are given in Figure 60A. In the case of both

parameters depth is greater under primitive than under

present conditions. Surface water seldom reaches the depth

under present conditions that is reached under primitive

conditions, and the water surface falls lower under present

conditions than under primitive conditions. Under present

conditions, simulated depth at the deepest point falls

below 3.5 ft (1.1 m) on four occasions; May 1962, 1967,