Marshes, Cypress Strands, and SwamD Hammocks

 Areas of major wetlands units were obtained from land

use maps for Hendry, Collier, and Lee Counties (DeBellevue,

1976; Brown,1976; Lehman, 1976). Maximum volumes of water

retained in sloughs were approximated by estimating average

depths of sloughs from elevation profiles (ALICO, pers.

comm. and Florida Department of Transportation, pers.

comm.). The profiles are listed in Table 4. Curves of

water depth versus water surface area were developed from

cross-sections from the profiles. Water volume was taken

as the integral of (or area under) each curve, and water

surface area was plotted against water volume.


Ponds of Less than 100 Acres

 Area of ponds was obtained by multiplying number of

ponds by average size of ponds. The ponds in each county

were marked and counted on a 1:250,000 scale index sheet of

Hurd infrared photographs from 1950. Average size of ponds

in sample areas was determined from 1:20,000 scale

Agricultural Soil Conservation and Stabilization (ASCS)

infrared aerial photographs (9" x 9") in Hendry and Collier

Counties. Figures 16 and 17 show the locations of the

areas covered by the sample 9" x 9" photographs. Areas of

circular or near-circular ponds were calculated by

measuring average diameters and using the equation for the

area of a circle. Areas of irregular shaped ponds were

determined by a digital planimeter (Hewlett-Packard