Hiawatha (Hillsborough County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°10'7", Longitude 82°34'22"
Period of record: 70 sampling dates; July 26, 1990 to December 27, 1999
Surface area (Shafer et al. 1986): 136 acres / 55 hectacres
Lake Region (Griffith et al. 1997): Keystone Lakes
Geologic formation (Brooks 1981):
The geology is dominated by argillaceous to sandy impure limestone of the Tampa Formation.
Physiographic region (Brooks 1981):
The water body lies in the Land-O-Lakes subdivision of the Tampa Plain division of the Ocala Uplift District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 2 months sampled:
|
pH |
6.4 |
Sulfate (mg/L) |
10.2 |
|
Total alkalinity (mg/L as CaCO3) |
2.5 |
Calcium (mg/L) |
4.0 |
|
Conductance (µS/cm @ 25 °C) |
100 |
Magnesium (mg/L) |
2.0 |
|
Color (Pt-Co units) |
26 |
Sodium (mg/L) |
10.0 |
|
Chloride (mg/L) |
20.3 |
Potassium (mg/L) |
2.0 |
|
Silicon (mg/L) |
0.5 |
|
|
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 70 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
10 |
18 |
28 |
|
Long-term total nitrogen concentrations (µg/L) |
420 |
590 |
820 |
|
Long-term total chlorophyll concentrations (µg/L) |
3.0 |
11.5 |
25.7 |
|
Long-term Secchi depth (ft) |
3.5 |
6.0 |
8.7 |
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-13-99 |
21 |
610 |
14.0 |
5.8 |
|
Feb-17-99 |
22 |
540 |
10.0 |
5.4 |
|
Mar-19-99 |
19 |
520 |
7.0 |
6.5 |
|
Apr-19-99 |
19 |
570 |
7.0 |
5.4 |
|
May-18-99 |
18 |
450 |
3.0 |
7.8 |
|
Jun-24-99 |
18 |
540 |
6.7 |
6.7 |
|
Jul-23-99 |
16 |
450 |
8.3 |
5.8 |
|
Aug-19-99 |
16 |
650 |
8.7 |
7.0 |
|
Sep-22-99 |
21 |
590 |
18.7 |
5.3 |
|
Oct-27-99 |
22 |
560 |
14.3 |
4.5 |
|
Nov-24-99 |
21 |
550 |
15.7 |
3.5 |
|
Dec-27-99 |
22 |
540 |
14.3 |
5.0 |
|
|
|
|
|
|
|
1999 Average |
20 |
550 |
10.6 |
5.7 |
Hiawatha (Hillsborough County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on July 16, 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) |
3.8 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
0.8 |
|
Average submersed plant biomass (kg wet wt/m2) |
1.1 |
|
Average width of emergent and floating-leaved zone (ft.) |
13 |
|
Average lake depth (m) |
4 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
maidencane |
Panicum hemitomon |
80 |
|
slender spikerush |
Eleocharis baldwinii |
60 |
|
musk-grass |
Chara spp. |
60 |
|
pickerelweed |
Pontederia cordata |
50 |
|
elephant-ear |
Colocasia esculenta |
50 |
|
water primrose |
Ludwigia octovalvis |
50 |
|
torpedograss |
Panicum repens |
40 |
|
sawgrass |
Cladium jamaicense |
30 |
|
spatterdock |
Nuphar luteum |
20 |
|
water-pennywort |
Hydrocotyle umbellata |
20 |
|
bald cypress |
Taxodium distichum |
20 |
|
red ludwigia |
Ludwigia repens |
10 |
|
cat-tail |
Typha spp. |
10 |
|
buttonbush |
Cephalanthus occidentalis |
10 |