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1. forces the sea down while depressions
cause it to rise
a big depression then can thus raise the
water by up to 30 centimeters
it's often accompanied by heavy rains
which make the situation worse
finally a strong constant wind blowing
towards land can cause a significant
rise in the water level of up to one
meter
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more and more frequently the venetian
republic is coming under threat from the
adriatic sea
probably the aqua grande of november the
4th 1966
driven by a storm and a strong
southeasterly wind
the water rose to 194 centimeters above
the reference level
five thousand venetians lost their homes
concerned that venice might be swallowed
up entirely spread across the world the
1970s to save the city a unique barrage
was designed in the form of the mohs
project
after 15 years of massive construction
works this ingenious system of floating
gates attached to the bottom of the
lagoon
is entering its final phase
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the system is managed from a control
center since 2011 whenever floods
threaten
computers can close the barriers
virtually simulating an emergency
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on these screens we see the information
that the operator will consult when
deciding whether or not to operate the
gates
they arrive directly from each opening
and give the status of each sluice
there is also marine weather data
so when do you decide to close an entry
the italian state has defined the rules
to put these mobile gates into operation
the water must rise to 1.10 meters above
the reference level
when we decide to lift the gates air is
injected
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they pivot around the hinges to a
position of 45 degrees
the operational angle
to lower them we inject water instead of
air
and then they sink returning to our
horizontal position on the bottom
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why not tilt the gates at 90 degrees