Beresford (Volusia County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°59'10", Longitude 81°20'34"
Period of record: 93 sampling dates; July 15, 1991 to December 21, 1999
Surface area (LAKEWATCH): No data available. (Bathymetric Map)
Lake Region (Griffith et al. 1997): Eastern Flatlands
Geologic formation (Brooks 1981):
The geology is dominated by dune sand and shell with silty sand, silt, and clay of the Princess Ann Formation.
Physiographic region (Brooks 1981):
The water body lies in the St. John’s Offset division of the Central Lake District.
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 93 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
39 |
72 |
146 |
|
Long-term total nitrogen concentrations (µg/L) |
860 |
1280 |
2130 |
|
Long-term total chlorophyll concentrations (µg/L) |
3.0 |
41.3 |
156.7 |
|
Long-term Secchi depth (ft) |
1.1 |
2.3 |
3.9 |
1999 Florida LAKEWATCH Data
Numbers reported below are monthly averages calculated from 3 stations for total phosphorus (TP, µg/L), total nitrogen (TN, µg/L), chlorophyll (CHL, µg/L) and Secchi depth (SECCHI, ft) during 1999:
|
Date |
TP (µg/L) |
TN (µg/L) |
CHL (µg/L) |
SECCHI (ft |
|
Feb-09-99 |
62 |
1210 |
57.0 |
2.4 |
|
Mar-09-99 |
65 |
1200 |
58.0 |
2.0 |
|
Apr-09-99 |
71 |
1350 |
71.3 |
1.8 |
|
May-12-99 |
83 |
1590 |
76.7 |
1.9 |
|
Jun-14-99 |
74 |
1470 |
73.0 |
1.7 |
|
Jul-15-99 |
49 |
1470 |
55.3 |
2.1 |
|
Aug-15-99 |
47 |
1620 |
62.7 |
2.0 |
|
Oct-16-99 |
80 |
1450 |
35.7 |
2.2 |
|
Nov-16-99 |
101 |
1540 |
4.0 |
2.0 |
|
Dec-21-99 |
96 |
1600 |
3.0 |
2.5 |
|
|
|
|
|
|
|
1999 Average |
73 |
1450 |
49.7 |
2.1 |
Beresford (Volusia County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on June 22, 1999
|
Percent area covered with aquatic vegetation (PAC, %) |
22 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
16 |
|
Average emergent plant biomass (kg wet wt/m2) |
10.7 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
5.8 |
|
Average submersed plant biomass (kg wet wt/m2) |
1.1 |
|
Average width of emergent and floating-leaved zone (ft.) |
68 |
|
Average lake depth (m) |
2 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
para grass |
Brachiaria mutica |
90 |
|
water-pennywort |
Hydrocotyle umbellata |
80 |
|
bald cypress |
Taxodium distichum |
80 |
|
red maple |
Acer rubrum |
80 |
|
floating water-hyacinth |
Eichhornia crassipes |
70 |
|
alligator-weed |
Alternanthera philoxeroides |
70 |
|
spatterdock |
Nuphar luteum |
70 |
|
giant reed |
Phragmites australis |
70 |
|
buttonbush |
Cephalanthus occidentalis |
60 |
|
tapegrass |
Vallisneria americana |
50 |
|
musk-grass |
Chara spp. |
50 |
|
water-lettuce |
Pistia stratiotes |
40 |
|
willow |
Salix spp. |
40 |
|
big rose mallow |
Hibiscus grandiflorus |
40 |
|
common salvinia |
Salvinia rotundifolia |
30 |
|
cat-tail |
Typha spp. |
30 |
|
elephant-ear |
Colocasia esculenta |
20 |
|
maidencane |
Panicum hemitomon |
20 |
|
three-square |
Scirpus americanus |
20 |
|
common duckweed |
Lemna minor |
10 |
|
bacopa |
Bacopa monnieri |
10 |
|
hydrilla |
Hydrilla verticillata |
10 |
|
salt-bush |
Baccharis spp. |
10 |
|
wax myrtle |
Myrica cerifera |
10 |
|
water primrose |
Ludwigia octovalvis |
10 |
|
Egyptian paspalidium |
Paspalidium geminatum |
10 |
|
elderberry |
Sambucus canadensis |
10 |
|
water hemlock |
Cicuta mexicana |
10 |
|
jointed flat sedge |
Cyperus haspan |
10 |
|
sword grass |
Scirpus pungens |
10 |
|
canna |
Canna spp. |
10 |