From Orlandoweather.com:
<http://b.www.orlandoweather.com/hurricanes/3716873/detail.html>
"But even the lower-than-expected rainfall from Frances was enough to flood low-lying areas along the St. Johns, which cuts between Seminole and Volusia, as well as areas of Osceola County such as Buenaventura Lakes and Poinciana, where water backed up in neighborhoods because it had nowhere to go.

Located on the south shore of Lake Monroe, which is part of the St. Johns River, Sanford is expected to see waters near the top of its sea wall by late Saturday, Decker said.

Flood stage is 5 feet 8 inches, and the waters are expected to rise to 6 feet 3 inches, he said. The sea wall is 7 feet, and the city has set aside a supply of sandbags.

Flooding problems would be worse if the district wasn't holding water upstream in two large reservoirs in Indian River County. The reservoirs cover 8,000 acres and hold millions of gallons of water.

For now, only one of the reservoirs is draining into the St. Johns -- and only at a minimum rate of about 5,000 gallons per second.

But the more it rains, the less likely the district can hold water in both reservoirs, Elledge said. Doing so could flood Indian River County.
"At some point, we're going to have to open that up," Elledge said. "Right now, we're able to hold that water. If we get another storm in the next week, then all bets are off.""