Howell (Seminole County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°38'21", Longitude 81°18'36"
Period of record: 47 sampling dates; August 16, 1991 to December 16, 1999
Surface area (Shafer et al. 1986): 406 acres / 164 hectacres
Lake Region (Griffith et al. 1997): Orlando Ridge
Geologic formation (Brooks 1981):
The geology is dominated by coastal sand and shelly silty sand of the preglacial Pleistocene.
Physiographic region (Brooks 1981):
The water body lies in the Casselberry-Oviedo-Geneva-Chuluota Hills division of the Central Lake District.
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 47 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
33 |
48 |
76 |
|
Long-term total nitrogen concentrations (µg/L) |
620 |
930 |
1650 |
|
Long-term total chlorophyll concentrations (µg/L) |
19.0 |
40.5 |
77.0 |
|
Long-term Secchi depth (ft) |
2.1 |
3.2 |
4.1 |
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-29-99 |
50 |
930 |
29.0 |
3.8 |
|
Feb-28-99 |
57 |
1020 |
40.0 |
3.8 |
|
Apr-03-99 |
57 |
900 |
32.0 |
3.6 |
|
May-06-99 |
54 |
950 |
36.7 |
3.4 |
|
Aug-01-99 |
64 |
1650 |
67.3 |
2.1 |
|
Dec-16-99 |
76 |
1120 |
29.5 |
2.8 |
|
|
|
|
|
|
|
1999 Average |
60 |
1090 |
39.1 |
3.2 |
Howell (Seminole County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on July 22, 1992
|
Percent area covered with aquatic vegetation (PAC, %) |
48 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
10 |
|
Average emergent plant biomass (kg wet wt/m2) |
2.6 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
1.4 |
|
Average submersed plant biomass (kg wet wt/m2) |
7.9 |
|
Average width of emergent and floating-leaved zone (ft.) |
37 |
|
Average lake depth (m) |
3 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
hydrilla |
Hydrilla verticillata |
100 |
|
bald cypress |
Taxodium distichum |
100 |
|
floating water-hyacinth |
Eichhornia crassipes |
60 |
|
water-pennywort |
Hydrocotyle umbellata |
60 |
|
elephant-ear |
Colocasia esculenta |
60 |
|
cat-tail |
Typha spp. |
50 |
|
maidencane |
Panicum hemitomon |
40 |
|
southern naiad |
Najas guadalupensis |
30 |
|
water primrose |
Ludwigia octovalvis |
30 |
|
red ludwigia |
Ludwigia repens |
20 |
|
tapegrass |
Vallisneria americana |
20 |
|
buttonbush |
Cephalanthus occidentalis |
20 |
|
willow |
Salix spp. |
20 |
|
common duckweed |
Lemna minor |
10 |
|
smartweed |
Polygonum hydropiperoides |
10 |
|
pickerelweed |
Pontederia cordata |
10 |
|
salt-bush |
Baccharis spp. |
10 |
|
torpedograss |
Panicum repens |
10 |
|
knot grass |
Paspalum distichum |
10 |
Howell (Seminole County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on May 2, 1994
|
Percent area covered with aquatic vegetation (PAC, %) |
58 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
16 |
|
Average emergent plant biomass (kg wet wt/m2) |
6.4 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
9.2 |
|
Average submersed plant biomass (kg wet wt/m2) |
17.5 |
|
Average width of emergent and floating-leaved zone (ft.) |
43 |
|
Average lake depth (m) |
3 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
floating water-hyacinth |
Eichhornia crassipes |
100 |
|
hydrilla |
Hydrilla verticillata |
90 |
|
common salvinia |
Salvinia rotundifolia |
70 |
|
cat-tail |
Typha spp. |
70 |
|
common duckweed |
Lemna minor |
50 |
|
elephant-ear |
Colocasia esculenta |
40 |
|
water primrose |
Ludwigia octovalvis |
30 |
|
alligator-weed |
Alternanthera philoxeroides |
20 |
|
water-pennywort |
Hydrocotyle umbellata |
20 |
|
buttonbush |
Cephalanthus occidentalis |
20 |
|
maidencane |
Panicum hemitomon |
20 |
|
torpedograss |
Panicum repens |
20 |
|
parrot's-feather |
Myriophyllum aquaticum |
10 |
|
red ludwigia |
Ludwigia repens |
10 |
|
salt-bush |
Baccharis spp. |
10 |
|
wax myrtle |
Myrica cerifera |
10 |
|
willow |
Salix spp. |
10 |
|
Baldwin flat sedge |
Cyperus globulosus |
10 |