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“Rivers have to be allowed to take more space. They have to be turned from
flood-chutes into
flood-foilers,” says Nienhuis. And the Dutch, for whom
preventing floods is a matter of survival, have gone
furthest. A nation built
largely on drained marshes and seabed had the fright of its life in 1993 when
the
Rhine almost overwhelmed it. The same happened again in 1995, when a
quarter of a million people were
evacuated from the Netherlands. But a new
breed of “soft engineers” wants our cities to become porous, and
Berlin is their
shining example. Since reunification, the city’s massive redevelopment has
been governed by
tough new rules to prevent its drains becoming overloaded
after heavy rains. Harald Kraft, an architect
working in the city, says: “We now
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