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harm is occurring)
SFWMD
2000
Caloosahatchee River
and Estuary
SFWMD Draft
May 2003
An MFL exceedance occurs...when
(a) a 30 day average
salinity...exceeds 10 ppt...or (b) a
single, daily
average...exceeds...20...for two
consecutive years.
Vegetation: The resource at risk is a
640 acre bed of tapegrass, Vallisneria
americana, located downstream of
structure S-79
Recovery
(i.e., Currently significant
harm is occurring)
SFWMD
2003a, b
Lower
Hillsborough
River
SWFWMD Under Study A study is underway to reevaluate
a proposed MFL to maintain
existing biological communities
Test discharges of low salinity (<0.5
psu) water below the dam from
various sources and biological
sampling to determine what biological
communities can be maintained
Recovery
(i.e., Currently significant
harm is occurring,)
Montagna
(1999),
Janicki Env.
Inc. (2002)
Lower St.
Johns River
SJRWMD Being
developed
MFL identifies flows and levels
that will prevent the 5 ppt isohaline
from being moved more than 0.8
miles upstream
Flora and fauna: Considered salinity
tolerances of 60 species fish, one
arthropod and one plant (i.e.,
Vallisneria americana)
Prevent Sig.Harm (i.e.,
acknowledges ‘stress’ on
1,130 ac of freshwater
plants)
ECT (2002)
Biscayne Bay Characteristics
Freshwater Flow and Ecological Relationships in Biscayne Bay 2-1
SECTION 2
BISCAYNE BAY CHARACTERISTICS
PROJECT BOUNDARIES AND SUB-REGIONS
Biscayne Bay is a large, shallow sub-tropical estuary located in eastern MiamiDade County, in close proximity to a highly urbanized coastal area (Figure 1).
On the east side of Biscayne Bay, several miles off the coast, are a number of
narrow, offshore barrier islands. In 1974, the entire Bay was designated as an
Aquatic Preserve by the Florida legislature, and a draft management plan for the
aquatic preserve was developed, but never adopted. The Bay has also been
designated as an “Aquatic Park and Conservation Area” by the Miami-Dade
Board of County Commissioners. Biscayne National Park encompasses a large
portion of the Bay and along the mainland shoreline lies the longest stretch of
mangrove forest on Florida's east coast. Inland, hardwood hammocks grow with
various native and non-native vegetation. Seagrasses grow in beds throughout
the bay wherever conditions are favorable. The Biscayne Bay watershed also
includes 83,000 acres of agricultural lands that are located to the west and
southwest. Vegetables, tropical fruit and nursery plants are grown within this
agricultural area.
The project area (Figure 1) being examined includes all of Biscayne Bay
extending from the Miami-Dade/Broward County line south to the MiamiDade/Monroe County line, and from the western shoreline of the Bay to the
eastern near-shore areas located east of the barrier islands, keys, and Sandy
Shoals. In the central and southerly portions of the Bay, the effects of freshwater
inflows are experienced in areas to the west of the mangrove-lined shoreline. In
these areas, the project area also includes the vegetated communities that extend
westward from the shoreline to the L-31 Canal.
Biscayne Bay varies considerably in a variety of physical characteristics,
including width, depth, water quality and degree of connection to the open
marine waters of the Straights of Florida and the Atlantic Ocean. The bay varies
in width from being extremely narrow in the most northerly reaches to over nine
miles wide in the central areas. Water depths within the project area vary from
comparatively shallow (i.e., less than 1 foot) in intertidal shoreline areas to over
40 feet in dredged navigation channels. Within the project area, water quality
varies from very poor, in deep areas that are subjected to heavy pollutant loading
and little mixing, to very good, in east-central areas where there is little overland
pollution and good exchange with marine waters. Surface waters of Biscayne
Bay are directly connected with open marine waters in some central bay areas,
SNAKE CREEK AND OLETA RIVER
NORTHERN BISCAYNE BAY
MIAMI RIVER/GOVERNMENT CUT
CENTRAL BISCAYNE BAY
SOUTH-CENTRAL BISCAYNE BAY
SOUTHERN BISCAYNE BAY