J Pat Carter/Associated Press
Protesters greeted Gov. Rick Scott as he toured the newly polluted areas. More Photos »
CLEWISTON, Fla. — On wind-whipped days when rain pounds this part of South Florida, people are quickly reminded that Lake Okeechobee, with its vulnerable dike and polluted waters, has become a giant environmental problem far beyond its banks.
Beginning in May, huge downpours ushered in the most significant threat in almost a decade to the bulging lake and its 80-year-old earthen dike, a turn of events with far-reaching consequences. The summer rains set off a chain reaction that devastated three major estuaries far to the east and west, distressing residents, alarming state and federal officials and prompting calls for remedial action.
With lake waters at their limit, there were only two choices, neither of them good. One was to risk breaching the 143-mile dike, a potential catastrophe to the agricultural tracts south of the lake and the small communities that depend on them. The other was to release billions of gallons of polluted water into delicate estuaries to the east and west.
Following its post-Hurricane Katrina guidelines, the Army Corps of Engineers chose the estuaries, rather than test the dike's vulnerabilities.
As a result, the St. Lucie River estuary in the east and the Caloosahatchee River estuary in the west, which depend on a naturally calibrated balance of salt and fresh water, were overwhelmed. The rush of fresh water from the lake and the estuaries' own river basins, along with the pollutants carried in from farms, ranches, septic tanks and golf courses, has crippled the estuaries and, on the east coast of the state, the Indian River Lagoon.
A breeding ground for marine life, estuaries are crucial to the ecosystem. As algae caused by pollutants quickly spread and fresh water overpowered saltwater, oysters died in droves. Manatees, shellfish and the sea grasses and reefs that help sustain the estuaries all were badly hit.
"These coastal estuaries cannot take this," said Mark D. Perry, the executive director of the Florida Oceanographic Society, based in Stuart. "Enough is enough. This cannot continue to happen. These estuaries are so important to us, our environment and our economies."
The damage to the estuaries has been so profound and the clamor from local communities so intense that political leaders have pledged action. Gov. Rick Scott, a Republican, visited the affected areas last month and proposed spending a total of $130 million for two separate projects.
One is intended to ease some of the pressure on Lake Okeechobee by allowing more water to go south into the Everglades, where it should flow naturally. The water will flow under a series of bridges that will be completed over the Tamiami Trail. By law, the water flowing into the Everglades is filtered and treated, unlike the water that heads to the estuaries.
South Florida was expressly engineered to prevent too much water from moving south, which is why most of the flow from the lake is pushed east and west. Canals to the south were dug to make way for agricultural fields, mostly containing sugar cane, and for urbanization. The little water that is released flows around those areas.
Environmentalists have fought for decades to correct the flow into the Everglades, a gargantuan and costly undertaking.
A second project would clean more of the polluted water in the St. Lucie River Basin that flows into the river. There are plans for a similar storm water treatment area on the west coast to help curb the damage.
"Every drop of water that we can send south and keep out of the Caloosahatchee and St. Lucie estuaries is a win for Florida families," Mr. Scott said recently when he proposed $90 million for one of the projects. "My message to families being impacted is that we will not give up on you."
Among other projects quickly moving forward is one to store more water outside the lake, including on private property, and another to unclog culverts south of the lake. A prominent state senator, Joe Negron, recently held a hearing in Stuart to talk about the problems stemming from the lake and possible solutions.
A top priority is repairing the frail Herbert Hoover Dike surrounding Lake Okeechobee, which is more than half the size of Rhode Island and is renowned for its bass fishing. A 2006 report on the lake found that the dike, long ranked among the most vulnerable in the country, posed a "grave and imminent danger."
But the repairs take time and large amounts of money.
Anda sedang membaca artikel tentang
In South Florida, a Polluted Bubble Ready to Burst
Dengan url
https://scienceteko.blogspot.com/2013/09/in-south-florida-polluted-bubble-ready.html
Anda boleh menyebar luaskannya atau mengcopy paste-nya
In South Florida, a Polluted Bubble Ready to Burst
namun jangan lupa untuk meletakkan link
In South Florida, a Polluted Bubble Ready to Burst
sebagai sumbernya
0 komentar:
Posting Komentar