Lake Okeechobee is a big water source for a lot of South Florida.
Whenever we gets lots of rain on/near that big puddle our water managers
at South Floriduh Water Management District usually open any number of
the water control gates to the many many canals that can route overflow
water from Lake O and/or the everglades drainage areas,
thus lowering the lake water levels.
They can also lower the lake in anticipation of a big wet one, be it a measely
tropical storm like Ernesto, or a hurricane.
Opening drainage gates typically results in an increased outflow of fresh water
from the Big O(keechobee), thru the canals, eventually into the Intracoastal
Waterway, and out thru the coastal inlets. I've seen it drain so much at one
point that the tide at Boynton inlet never came in for 2 days
- it was a constant outflow of nice brown brackish water.
Brown water ... makes coastal diving a bit of a mess, and it also drives up the
bacterial test counts in the coastal waters. If you hear of em draining or lowering
the big O, keep an eye out for local beach closings (rare)
but also dig around for bacterial count tests.
A good source ...
http://surfrider.org/waterquality.asp