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the potentiometer settings which determined mean,

amplitude, and frequency of the signals. The maximum,

minimum and mean for the annual solar radiation cycle were

based on long-term semi-monthly measurements at Belle Glade

(R.J. Allen, Jr., pers. comm.). The maximum, minimum and

mean for the annual cycle of surface water area were based

on the digital simulation of surface water area fluctuation

(Figure 61) under 1974-75 (June-May) rainfall conditions

using the water model (model in Figure 14).

 Solar radiation was the same in each simulation, but

amplitude and mean of the water area variation were changed

to approximate primitive (predrainage) conditions,

conditions less drained than present, present conditions,

and conditions more drained than present. Model I

simulated the ecosystem's response to primitive conditions,

present conditions, and conditions with maximum and minimum

water levels lowered approximately 1.5 ft (46 cm) below

present. Model II simulated the system's response to a

water table approximately 3 inches (7.6 cm) higher than

present, the present condition, the water table 8 inches

(20 cm) lower than present, and the water level fluctuation

approximately 1.5 ft lower than present.

 Model II also simulated situations in which mean areas

of land surface covered by water were the same as the

present condition but seasonal oscillations were reduced.

Simulations were made with five different degrees of

damping of the oscillation.