Grandin (Putnam County)

Florida LAKEWATCH Water Chemistry Summary

Location: Latitude 29°40'33", Longitude 81°52'51"

Period of record: 103 sampling dates; November 1, 1988 to November 23, 1999

Surface area (LAKEWATCH): 311 acres / 126 hectacres      Bathymetric Map

Lake Region (Griffith et al. 1997): Eastern Flatlands

Geologic formation (Brooks 1981):

The geology is dominated by undifferentiated sand with humate zones and concentrations of heavy minerals of the Pliocene.

Physiographic region (Brooks 1981):

The water body lies in the Interlachen Sand Hills division of the Central Lake District.

Supplemental, unpublished water chemistry data, University of Florida.

Numbers reported below are the average for 2 months sampled:
 
pH
5.5
 Sulfate (mg/L)
7.2
Total alkalinity (mg/L as CaCO3)
0.4
 Calcium (mg/L)
2.5
Conductance (µS/cm @ 25 °C)
54
 Magnesium (mg/L)
1.0
Color (Pt-Co units)
35
 Sodium (mg/L)
5.2
Chloride (mg/L)
9.5
 Potassium (mg/L)
0.0
Silicon (mg/L)
0.6
    

Long-term Florida LAKEWATCH Data

Numbers reported below are the minimum, average, and maximum value for the 103 months sampled:

 
Minimum
Average
Maximum
Long-term total phosphorus concentrations (µg/L)
16
32
70
Long-term total nitrogen concentrations (µg/L)
150
540
860
Long-term total chlorophyll concentrations (µg/L)
4.7
21.3
45.3
Long-term Secchi depth (ft)
1.5
3.4
5.5

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-25-99
26
400
14.3
4.0
Feb-19-99
38
460
25.0
3.5
Mar-22-99
32
370
18.0
3.5
Apr-20-99
70
690
8.3
2.5
May-24-99
40
640
13.3
3.3
Jul-20-99
33
480
11.0
4.7
Aug-23-99
33
510
26.0
3.5
Oct-26-99
22
530
34.7
3.5
Nov-23-99
30
540
30.0
3.5
         
1999 Average
36
510
20.1
3.6

Grandin (Putnam County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on August 6, 1991

Percent area covered with aquatic vegetation (PAC, %)
8
Percent of lake's volume filled with vegetation (PVI, %)
2
Average emergent plant biomass (kg wet wt/m2)
1.2
Average floating-leaved plant biomass (kg wet wt/m2)
1.6
Average submersed plant biomass (kg wet wt/m2)
0.0
Average width of emergent and floating-leaved zone (ft.)
49
Average lake depth (m)
2

Frequency that plant species occur in 10 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
water-pennywort Hydrocotyle umbellata
80
elephant-ear Colocasia esculenta
50
water primrose Ludwigia octovalvis
50
maidencane Panicum hemitomon
40
spatterdock Nuphar luteum
30
smartweed Polygonum hydropiperoides
30
cat-tail Typha spp.
30
para grass Brachiaria mutica
30
floating water-hyacinth Eichhornia crassipes
20
common salvinia Salvinia rotundifolia
20
red root Lachnanthes caroliniana
20
alligator-weed Alternanthera philoxeroides
10
slender spikerush Eleocharis baldwinii
10
pickerelweed Pontederia cordata
10
willow Salix spp.
10
torpedograss Panicum repens
10
yellow-eyed grass Xyris spp.
10

Grandin (Putnam County)

Florida LAKEWATCH Aquatic Plant Summary

Aquatic plant data collected on June 16, 1998

Percent area covered with aquatic vegetation (PAC, %)
12
Percent of lake's volume filled with vegetation (PVI, %)
5
Average emergent plant biomass (kg wet wt/m2)
22.3
Average floating-leaved plant biomass (kg wet wt/m2)
17.0
Average submersed plant biomass (kg wet wt/m2)
0.2
Average width of emergent and floating-leaved zone (ft.)
93
Average lake depth (m)
2

Frequency that plant species occur in 10 evenly spaced transects around the lake.

Common Name Plant Species
Frequency (%)
water primrose Ludwigia octovalvis
100
smartweed Polygonum hydropiperoides
90
wax myrtle Myrica cerifera
90
floating water-hyacinth Eichhornia crassipes
70
common salvinia Salvinia rotundifolia
70
pickerelweed Pontederia cordata
70
elephant-ear Colocasia esculenta
70
para grass Brachiaria mutica
60
slender spikerush Eleocharis baldwinii
50
cat-tail Typha spp.
50
water-pennywort Hydrocotyle umbellata
40
buttonbush Cephalanthus occidentalis
30
torpedograss Panicum repens
30
alligator-weed Alternanthera philoxeroides
20
baby-tears Micranthemum umbrosum
20
maidencane Panicum hemitomon
20
water spider orchid Habenaria repens
20
duck-potato Sagittaria lancifolia
10
frog's-bit Limnobium spongia
10
fragrant water-lily Nymphaea odorata
10
salt-bush Baccharis spp.
10
willow Salix spp.
10
soft rush Juncus effusus
10
knot grass Paspalum distichum
10
rush spp. Juncus dichotomus
10
red maple Acer rubrum
10

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