Hewitt (Putnam County)

Hewitt (Putnam County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 29°32'32", Longitude 81°55'35"

Period of record: 14 sampling dates; April 11, 1990 to September 24, 1991

Surface area (Shafer et al. 1986): 97 acres / 39 hectacres

Lake Region (Griffith et al. 1997): Trail Ridge

Geologic formation (Brooks 1981):

The geology is dominated by quartz sand and quartzite gravel with sandy clay beds of the Hawthorne Formation.

Physiographic region (Brooks 1981):

The water body lies in the St. John’s Offset division of the Central Lake District.

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 2 months sampled:

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 14 months sampled:

	Minimum	Average	Maximum
Long-term total phosphorus concentrations (µg/L)	4	8	19
Long-term total nitrogen concentrations (µg/L)	110	170	280
Long-term total chlorophyll concentrations (µg/L)	1.3	4.5	12.7
Long-term Secchi depth (ft)	4.4	8.4	12.7

Florida LAKEWATCH data were not collected in 1999.

Hewitt (Putnam County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on May 20, 1992

Percent area covered with aquatic vegetation (PAC, %)	0
Percent of lake's volume filled with vegetation (PVI, %)	0
Average emergent plant biomass (kg wet wt/m2)	2.1
Average floating-leaved plant biomass (kg wet wt/m2)	1.5
Average submersed plant biomass (kg wet wt/m2)	0.9
Average width of emergent and floating-leaved zone (ft.)	34
Average lake depth (m)	3

Frequency that plant species occur in 10 evenly spaced transects around the lake.