The ANNOTICO Reports
The Moses Project is a daring $4.5 billion dollar
construction project
sponsored by the Italian government
that is a series of 78 gargantuan movable underwater
dams that would rest
on the floor of the Adriatic Sea, massive barriers that
would be
mechanically raised above the surface when needed to
block extraordinary
high tide surges.
Venice in Peril, a British nongovernmental organization,
claims that
approach is very scary because it is a very inflexible
and untested
solution.
However if something isn't done, those concerned wonder
where Venice might
be in 100 years. "It's so overwhelming and sad. Maybe
it will be closed off
as a lake. Maybe it will be underwater and tourists can
see it from a
glass-bottom boat."
At the heart of the debate is tension between those who
believe in the
power of human technology to thwart the forces of nature
and those who
worry that Italy's master engineers, in their hubris,
may only complicate
Venice's problem.
New York Times
International Herald Tribune
By Elisabeth Rosenthal
February 22, 2005
VENICE - When Jane da Mosto scrambles from the water taxi
onto the front
steps of her family's ancient palazzo on the Grand Canal,
her gaze is
tinged with mourning. The once glorious Casa da Mosto
is now little more
than a decaying, waterlogged shell of a building, the
rising and
increasingly salty water of Venice lapping at the door
and eating away at
its walls.
"One day it will just fall into the canal," said Ms. da
Mosto, a researcher
with Corila, a consortium of groups studying the Venice
lagoon in hopes of
saving it.
Now, a daring multibillion-dollar construction project
sponsored by the
Italian government is just getting under way, in an effort
to meet that
goal. But many, including Ms. da Mosto, are skeptical
that it will be
enough."I don't like to think about where Venice might
be in 100 years,"
she said. "It's so overwhelming and sad. Maybe it will
be closed off as a
lake. Maybe it will be underwater and tourists can see
it from a
glass-bottom boat."
The Venice lagoon is one of the world's most delicate
and unstable
ecosystems, a unique place where saving a dying natural
habitat is crucial
to preserving human culture and history: centuries of
art and architecture
sit within the nature preserve and will be lost if the
lagoon succumbs.
And that has prompted increasingly passionate debates
here about radical
plans now under way to save it - plans that push at the
limits of
scientific knowledge and engineering capacity.
At the heart of the debate is tension between those who
believe in the
power of human technology to thwart the forces of nature
and those who
worry that Italy's master engineers, in their hubris,
may only complicate
Venice's problem.
The centerpiece of the Italian government's ambitious
plan - called the
Moses Project, after the parting of the Red Sea - is
a series of 78
gargantuan movable underwater dams that would rest on
the floor of the
Adriatic Sea, massive barriers that would be mechanically
raised above the
surface when needed to block extraordinary high tide
surges. Such tides,
which generally now occur a few times a year, produce
devastation in Venice
that is rapid and, at times, disastrous, like the flood
of 1966.
A prime project of Prime Minister Silvio Berlusconi, the
high-tech barriers
have a political weight that matches their physical heaviness,
300 tons
each, and their $4.5 billion price.
"These barriers are a huge environmental intervention
on a scale never done
before," said Alberto Scotti, the project's chief engineer,
who is as
confident and pragmatic about the plan as others are
emotional.
Critics worry that the huge barriers could further upset
nature's delicate
balance. They note that the barriers do nothing to allay
the city's
day-to-day deterioration, a result of more subtle forces
in the dying
lagoon, requiring less glamorous solutions.
Slowly sinking land and slowly rising water have left
many building walls
perpetually underwater. Increasing salt content in the
canals threatens the
city's foundations. The death of plant life on the lagoon
bed has turned
once variegated channels into conduits for rushing water
that pours into
the city every time there is a sea squall.
"At the moment, everyone is focused on the barrier - which
is very scary
because it is a very inflexible and untested solution,"
said Ms. da Mosto,
co-author of "The Science of Saving Venice," a book sponsored
by Venice in
Peril, a British nongovernmental organization.
"A lot of scientists think it will do the job, and a lot
think it won't,"
she added. "I can't tell you what the solution is, but
you also need to
stabilize the environment. And what I do know is that
the lagoon is
immensely complicated, and the more one relies on diverse
and reversible
solutions the better."
With comprehensive computer models and feasibility studies,
Mr. Scotti
stands behind his design. "We have checked everything
with modeling," he
said with a hint of exasperation. "We have models for
the morphology of the
lagoon. We can reproduce the wind, weather and tides.
And our models
suggest this will work and will have no negative environmental
impact."
Patching up Venice's continuing wounds is already an obsession,
and a
full-time job, for city officials and residents.
On a recent day in the Squero di San Trovaso, home of
Venice's famed
gondola workshops, the canals had been drained dry for
repairs. Dozens of
workers from Insula, a public-private partnership that
maintains the
canals, are poring over each centimeter of wall, patching
up areas of decay
and pumping foam through bright green hoses into the
walls in order to
reinforce them.
"Venice has to be maintained like a boat: you take it
out of water and
repair it," said Giorgio Barbarini, the driver of a water
taxi. "Venice is
falling apart because it is hard to maintain a whole
city like that."
>From an evolutionary standpoint, Venice's decline is
perhaps inevitable.
Lagoons, with their marshes and brackish waters, are
transitional coastal
ecosystems, tending to become freshwater lakes or to
blend in with the
adjacent sea over time. That process accelerates when
man cohabits with
this unstable bit of nature, as he has here for well
over 1,000 years.
Venetians have long manipulated water to protect their
city, diverting
rivers in the 14th century.
But the rapid changes in the ecosystem have occurred with
modernization in
the 20th century. Starting in the 1930's, an industrial
zone and other
lands were created by pumping groundwater out of the
marsh, seriously
accelerating sinkage. Shipping and pollution that followed
eroded many of
the crucial defensive features of the lagoon that for
centuries helped to
keep the sea at bay.
For example, the once textured lagoon floor is now mostly
flat and bereft
of plants, allowing water surges from sea storms to find
their way
unimpeded into the city.
The result is that the average water level in Venice is
9 inches, higher
than it was a century ago, and perhaps 40 inches higher
than 250 years ago,
according to researchers at Corila. The once brackish
water is now as salty
as the sea.
Global warming has not yet contributed substantially to
rising water levels
here, Ms. da Mosto said. Predictions of the phenomenon's
eventual effect on
the Adriatic vary widely: some scientists estimate a
rise due to global
warming of just three inches and others suggest the change
may be nearly a
yard.
Already, water routinely fills piazzas and seeps into
churches. It backs up
into homes through the sewers. It corrodes building walls
never meant to be
submerged. While the foundations of Venetian palazzos
were built of
materials that withstand water, the walls are brick and
porous.
"Lots of money has gone in to replastering and replacing
walls brick by
brick. We call it the sacrificial layer," Ms. da Mosto
said. "But in a few
years it is crumbling."
Against this backdrop, designers of the Moses Project
often seem perplexed
at the resistance in the city they have vowed to save.
There were years of
negotiations with local officials and environmental groups
before
construction got under way in May 2003.
Mr. Scotti noted that the project involved not just the
barriers, which
will be completed by 2010, but also plans to reinforce
building walls to
protect them from lesser floods, and designs to re-establish
wetlands as
well. Critics contend that these features are poorly
developed
afterthoughts.
"People here just accept floods and boots as part of life,"
Mr. Scotti
said. "But living in this condition puts them at a big
disadvantage
compared to people in Milan and Rome. This will mean
a change of life for
them."
Mr. Scotti's engineering challenge was enormous, both
in terms of the tidal
force and the government's requirement that the barriers
(far out at sea)
be invisible when not in use, a decision that many say
unnecessarily added
millions to the project.
Teams are now building artificial breakwaters to attenuate
tides. Over
time, thousands of steel poles will be pounded into the
floor of the
lagoon. To house the barriers, cement blocks, measuring
about 66 yards by
44 yards by 12 yards will be embedded in the sea floor.
It is the very size of the project that terrifies skeptics,
who fear that
such a huge endeavor will further disturb the lagoon.
While the Venice
lagoon has been studied extensively by scientists, much
of the work was
done locally and never coordinated or presented in scientific
journals, Ms.
da Mosto said. As a result, the complicated ecosystem
remains poorly
understood, she said.
But designers say they will build slowly and with extraordinary
care to
create a new safe haven for Venetians - even if it is
does not conform with
the lagoon's natural form. "Look, there is no natural
environment to
recover here in Venice anymore," Mr. Scotti said. "It
has been changed by
man for hundreds of years."
"What is important is to create a lagoon with a lot of
possibilities of
life," he continued. "The shape will not be natural.
The plants will not be
the same. There will be artificial material. There are
no books on how to
build a lagoon.
"We are human, so of course we are not able to reproduce
what God made
before."
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