Marsha (Orange County)
Florida LAKEWATCH Water Chemistry Summary
Location: Latitude 28°28'42", Longitude 81°28'58"
Period of record: 85 sampling dates; June 13, 1992 to December 17, 1999
Surface area : No data available.
Lake Region (Griffith et al. 1997): Doctor Phillips Ridge
Geologic formation (Brooks 1981):
The geology is dominated by phosphatic sand, silty sand, and clay of the Hawthorne Formation.
Physiographic region (Brooks 1981):
The water body lies in the Dr. Phillips Ridge division of the Central Lake District.
Supplemental, unpublished water chemistry data, University of Florida.
Numbers reported below are the average for 1 month sampled:
|
pH |
6.9 |
Sulfate (mg/L) |
13.3 |
|
Total alkalinity (mg/L as CaCO3) |
12.0 |
Conductance (µS/cm @ 25 °C) |
129 |
|
Color (Pt-Co units) |
13 |
Chloride (mg/L) |
22.0 |
Long-term Florida LAKEWATCH Data
Numbers reported below are the minimum, average, and maximum value for the 85 months sampled:
|
|
Minimum |
Average |
Maximum |
|
Long-term total phosphorus concentrations (µg/L) |
4 |
10 |
41 |
|
Long-term total nitrogen concentrations (µg/L) |
170 |
430 |
920 |
|
Long-term total chlorophyll concentrations (µg/L) |
1.0 |
3.5 |
16.3 |
|
Long-term Secchi depth (ft) |
9.0 |
13.7 |
18.0 |
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 |
|
Feb-21-99 |
11 |
490 |
7.0 |
10.3 |
|
Mar-25-99 |
13 |
420 |
4.0 |
10.7 |
|
Apr-29-99 |
15 |
490 |
3.7 |
12.4 |
|
May-19-99 |
7 |
330 |
2.7 |
11.3 |
|
Jun-28-99 |
11 |
550 |
3.7 |
12.0 |
|
Jul-29-99 |
6 |
440 |
3.7 |
13.3 |
|
Aug-21-99 |
9 |
490 |
3.7 |
13.1 |
|
Sep-29-99 |
41 |
920 |
4.7 |
13.5 |
|
Oct-18-99 |
17 |
500 |
3.0 |
15.3 |
|
Nov-25-99 |
19 |
480 |
2.0 |
12.5 |
|
Dec-17-99 |
11 |
500 |
2.7 |
13.4 |
|
|
|
|
|
|
|
1999 Average |
14 |
510 |
3.7 |
12.5 |
Marsha (Orange County)
Florida LAKEWATCH Aquatic Plant Summary
Aquatic plant data collected on September 2, 1993
|
Percent area covered with aquatic vegetation (PAC, %) |
44 |
|
Percent of lake's volume filled with vegetation (PVI, %) |
6 |
|
Average emergent plant biomass (kg wet wt/m2) |
5.2 |
|
Average floating-leaved plant biomass (kg wet wt/m2) |
2.8 |
|
Average submersed plant biomass (kg wet wt/m2) |
8.3 |
|
Average width of emergent and floating-leaved zone (ft.) |
61 |
|
Average lake depth (m) |
6 |
Frequency that plant species occur in 10 evenly spaced transects around the lake.
|
Common Name |
Plant Species |
Frequency (%) |
|
fragrant water-lily |
Nymphaea odorata |
100 |
|
bog-moss |
Mayaca fluviatilis |
100 |
|
maidencane |
Panicum hemitomon |
90 |
|
hydrilla |
Hydrilla verticillata |
80 |
|
pickerelweed |
Pontederia cordata |
70 |
|
musk-grass |
Chara spp. |
70 |
|
rush fuirena |
Fuirena scirpoidea |
70 |
|
banana-lily |
Nymphoides aquatica |
60 |
|
water primrose |
Ludwigia octovalvis |
60 |
|
red ludwigia |
Ludwigia repens |
40 |
|
dwarf arrowhead |
Sagittaria subulata |
40 |
|
wax myrtle |
Myrica cerifera |
40 |
|
torpedograss |
Panicum repens |
40 |
|
water-pennywort |
Hydrocotyle umbellata |
30 |
|
southern naiad |
Najas guadalupensis |
30 |
|
buttonbush |
Cephalanthus occidentalis |
30 |
|
Florida bladderwort |
Utricularia floridana |
30 |
|
St. John's wort |
Hypericum spp. |
30 |
|
red root |
Lachnanthes caroliniana |
30 |
|
yellow-eyed grass |
Xyris spp. |
30 |
|
. |
Scirpus cubensis |
30 |
|
slender spikerush |
Eleocharis baldwinii |
20 |
|
smartweed |
Polygonum hydropiperoides |
20 |
|
cat-tail |
Typha spp. |
20 |
|
common duckweed |
Lemna minor |
10 |
|
frog's-bit |
Limnobium spongia |
10 |
|
spatterdock |
Nuphar luteum |
10 |
|
cone-spur bladderwort |
Utricularia gibba |
10 |
|
salt-bush |
Baccharis spp. |
10 |
|
willow |
Salix spp. |
10 |
|
flat-sedge |
Cyperus odoratus |
10 |
|
pipewort |
Eriocaulon spp. |
10 |
|
Tracy's beak-rush |
Rhynchospora tracyi |
10 |
|
leconte sedge |
Cyperus lecontei |
10 |