Crescent (Hillsborough County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°9'26", Longitude 82°35'28"
Period of record: 70 sampling dates; October 8, 1990 to December 31, 1999
Surface area (Shafer et al. 1986): 46 acres / 19 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Supplemental, unpublished water chemistry data, University of Florida.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 3 months sampled:
|
pH |
5.6 |
Sulfate (mg/L) |
33.0 |
|
Total alkalinity (mg/L as CaCO3) |
0.8 |
Calcium (mg/L) |
8.1 |
|
Conductance (µS/cm @ 25 °C) |
155 |
Magnesium (mg/L) |
4.0 |
|
Color (Pt-Co units) |
37 |
Sodium (mg/L) |
8.4 |
|
Chloride (mg/L) |
20.8 |
Potassium (mg/L) |
5.4 |
|
Silicon (mg/L) |
0.4 |
|
|
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) |
9 |
18 |
46 |
|
Long-term total nitrogen concentrations (µg/L) |
440 |
620 |
780 |
|
Long-term total chlorophyll concentrations (µg/L) |
2.3 |
10.2 |
59.7 |
|
Long-term Secchi depth (ft) |
3.7 |
6.2 |
10.8 |
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-30-99 |
19 |
650 |
15.3 |
5.7 |
|
Feb-27-99 |
19 |
680 |
5.7 |
8.0 |
|
Mar-27-99 |
16 |
610 |
3.7 |
7.0 |
|
May-02-99 |
19 |
660 |
6.7 |
6.9 |
|
May-28-99 |
15 |
660 |
3.0 |
7.0 |
|
Jun-27-99 |
14 |
750 |
6.0 |
8.2 |
|
Aug-07-99 |
13 |
580 |
4.7 |
7.6 |
|
Sep-03-99 |
14 |
770 |
6.3 |
7.8 |
|
Oct-01-99 |
13 |
720 |
4.3 |
9.4 |
|
Nov-05-99 |
14 |
640 |
6.0 |
6.5 |
|
Dec-12-99 |
12 |
520 |
5.7 |
6.9 |
|
Dec-31-99 |
14 |
580 |
6.7 |
8.7 |
|
|
|
|
|
|
|
1999 Average |
15 |
650 |
6.2 |
7.5 |
Crescent (Hillsborough County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on July 13, 1993
|
Percent area covered with aquatic vegetation (PAC, %) |
34 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
3 |
|
Average emergent plant biomass (kg wet wt/m2) |
3.8 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
0.5 |
|
Average submersed plant biomass (kg wet wt/m2) |
0.9 |
|
Average width of emergent and floating-leaved zone (ft.) |
21 |
|
Average lake depth (m) |
3 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
slender spikerush |
Eleocharis baldwinii |
100 |
|
spatterdock |
Nuphar luteum |
80 |
|
maidencane |
Panicum hemitomon |
80 |
|
torpedograss |
Panicum repens |
80 |
|
wax myrtle |
Myrica cerifera |
70 |
|
water primrose |
Ludwigia octovalvis |
60 |
|
pickerelweed |
Pontederia cordata |
50 |
|
water-pennywort |
Hydrocotyle umbellata |
50 |
|
buttonbush |
Cephalanthus occidentalis |
40 |
|
melaleuca |
Melaleuca quinquenervia |
30 |
|
. |
Juncus scirpoides |
20 |
|
common salvinia |
Salvinia rotundifolia |
10 |
|
fragrant water-lily |
Nymphaea odorata |
10 |
|
cat-tail |
Typha spp. |
10 |
|
willow |
Salix spp. |
10 |
|
para grass |
Brachiaria mutica |
10 |
|
yellow-eyed grass |
Xyris spp. |
10 |