Ashby (Volusia County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°55'29", Longitude 81°5'58"
Period of record: 78 sampling dates; June 27, 1993 to December 29, 1999
Surface area (Shafer et al. 1986): No data available.
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 Wet Prairie division of the Eastern Flatwoods District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 3 months sampled:
|
pH |
6.9 |
Sulfate (mg/L) |
6.8 |
|
Total alkalinity (mg/L as CaCO3) |
12.7 |
Calcium (mg/L) |
6.9 |
|
Conductance (µS/cm @ 25 °C) |
80 |
Magnesium (mg/L) |
6.8 |
|
Color (Pt-Co units) |
146 |
Sodium (mg/L) |
7.3 |
|
Chloride (mg/L) |
13.5 |
Potassium (mg/L) |
0.8 |
|
Silicon (mg/L) |
1.8 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 78 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
32 |
95 |
182 |
|
Long-term total nitrogen concentrations (µg/L) |
390 |
800 |
1470 |
|
Long-term total chlorophyll concentrations (µg/L) |
0.7 |
5.8 |
97.3 |
|
Long-term Secchi depth (ft) |
1.0 |
1.7 |
4.3 |
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 |
|
Jan-16-99 |
110 |
800 |
1.7 |
1.0 |
|
Feb-20-99 |
109 |
840 |
3.0 |
1.5 |
|
Mar-20-99 |
96 |
780 |
4.7 |
1.5 |
|
Apr-17-99 |
106 |
820 |
3.3 |
1.0 |
|
May-15-99 |
99 |
760 |
9.7 |
1.5 |
|
Jun-19-99 |
84 |
670 |
5.0 |
2.0 |
|
Jul-17-99 |
113 |
630 |
7.3 |
2.0 |
|
Aug-14-99 |
125 |
1470 |
97.3 |
1.5 |
|
Sep-25-99 |
115 |
910 |
15.0 |
1.7 |
|
Oct-22-99 |
181 |
1070 |
0.7 |
1.5 |
|
Nov-20-99 |
182 |
1170 |
1.3 |
1.0 |
|
Dec-29-99 |
131 |
1150 |
1.0 |
1.0 |
|
|
|
|
|
|
|
1999 Average |
121 |
920 |
12.5 |
1.4 |
Ashby (Volusia County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on August 4, 1994
|
Percent area covered with aquatic vegetation (PAC, %) |
34 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
5 |
|
Average emergent plant biomass (kg wet wt/m2) |
3.2 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
3.4 |
|
Average submersed plant biomass (kg wet wt/m2) |
1.2 |
|
Average width of emergent and floating-leaved zone (ft.) |
167 |
|
Average lake depth (m) |
2 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
spatterdock |
Nuphar luteum |
100 |
|
cat-tail |
Typha spp. |
100 |
|
water primrose |
Ludwigia octovalvis |
90 |
|
alligator-weed |
Alternanthera philoxeroides |
80 |
|
floating water-hyacinth |
Eichhornia crassipes |
60 |
|
tapegrass |
Vallisneria americana |
60 |
|
common salvinia |
Salvinia rotundifolia |
50 |
|
smartweed |
Polygonum hydropiperoides |
40 |
|
wax myrtle |
Myrica cerifera |
40 |
|
azolla |
Azolla caroliniana |
30 |
|
duck-potato |
Sagittaria lancifolia |
30 |
|
water-pennywort |
Hydrocotyle umbellata |
30 |
|
hydrilla |
Hydrilla verticillata |
30 |
|
maidencane |
Panicum hemitomon |
30 |
|
pickerelweed |
Pontederia cordata |
20 |
|
willow |
Salix spp. |
20 |
|
flat-sedge |
Cyperus odoratus |
20 |
|
parrot's-feather |
Myriophyllum aquaticum |
10 |
|
southern naiad |
Najas guadalupensis |
10 |
|
buttonbush |
Cephalanthus occidentalis |
10 |
|
giant bulrush |
Scirpus californicus |
10 |
|
torpedograss |
Panicum repens |
10 |
|
rush fuirena |
Fuirena scirpoidea |
10 |
|
red root |
Lachnanthes caroliniana |
10 |
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