aquatic life at the study site to be related to seasonal

changes in water depths.



Topographic Survey and Mapping

 A contour map for the general area of the study site

was prepared from topographic survey data collected by L.

L. Hampton in 1962 (pers. comm.). One-half ft (0.1524 m)

contours were mapped from elevation data at 400 ft (122 m)

distances along four parallel lines approximately 2675 ft

(815 m) apart and two connecting lines perpendicular to

them. The contour map covered an area of approximately

2585 ha and included the study -pond and marsh transect.

Elevations on the contour map were corrected to mean sea

level based on bench mark information from M. Duever (pers.

comm.).

 At the study site, elevations were measured to the

nearest 0.01 ft (3 mm) along two perpendicular transect

lines through the study pond using a surveyor's elevation

rod and a surveyor's level. One transect line extended

1200 ft (366 m) into the marsh from the edge of the pond.

On the opposite side of the pond this line intercepted a

recording well, the ground elevation of which had been

corrected to mean sea level by means of a nearby benchmark.

A contour map of the pond and cross-sectional profiles of

the pond and the marsh transect were prepared from the

survey data.