Weekly Estuarine
Conditions Update - As of April 21, 2009
St. Lucie Estuary
Current Conditions:
Over the past week,
no discharge occurred at S-80. Discharge from the
|
Weekly Average Salinity (ppt) |
|
|
Sampling Site |
Surface |
Bottom |
Envelope |
|
20.5 (20.7) |
21.5 (21.1) |
|
HR1 (N. Fork) |
24.8 (23.8) |
25.7 (24.6) |
|
|
27.3 (26.2) |
27.5 (26.5) |
8.0 – 25.0 |
A1A Bridge |
31.6 (30.4) |
33.4 (32.1) |
20.0 – 31.0 |
Salinity throughout the estuary increased slightly last week. At both the Roosevelt and A1A Bridges, weekly average salinity is slightly above the upper bound of the preferred range. Salinity conditions in the estuary are considered to be fair considering the time of year, the location in the estuary, and salinity preference of the oyster, Crassostrea virginica.
Caloosahatchee Estuary
Current Conditions:
During the past week, discharge averaged 324 cfs at S-79, 277 cfs at S-78, and 703 cfs at S-77. The concentration of chlorides at the Olga Plant was 129 ppm yesterday. The current weekly average salinities (in bold) at the six monitoring sites in the Caloosahatchee Estuary are given below in parts per thousand (ppt), along with the previous week’s (in parenthesis).
Weekly Average Salinity (ppt) |
||
Sampling Site |
Surface |
Bottom |
|
5.3 (5.5) |
6.4 (6.4) |
Rt. 31 Bridge |
5.3 (7.6) |
7.0 (9.0) |
I-75 Bridge |
6.0 (9.7) |
9.6 (11.4) |
|
14.8 (17.8) |
18.5 (18.6) |
|
24.7 (25.9) |
25.2 (26.9) |
Shell Point |
34.1 (34.2) |
34.5 (35.2) |
The 7 day pulse
release at S-79 ended on Friday, 4/17/09. Average salinity decreased
slightly throughout the estuary. Conditions in the upper estuary east of
FWRI (Fish and
Wildlife Research Institute) reports that water samples collected alongshore
between Pinellas and
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