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Flood model overestimated flows

FLOODING IN Prague was not as bad as experts had predicted, engineers have said.

According to models produced by Prague University for flood defence planners, water levels should have risen higher.

Instead, the Vltava river which runs through the city handled higher than expected flows, and although flood defences were overtopped, the extend of flooding was not as widespread as expected.

According to the Prague university model, in a 1 in 100 year flood, flows of 4,000m expected in the Vltava.

In the event flows of 5,000m 3/sec were recorded - a one in 150 year event. But flooding was less extensive than that assumed in the 1 in 100 year model.

The model was produced for a Babtie engineered flood defence that was built last year. 'There are many possible reasons for the disparity of the figures - such as upstream inundation. But we will have to wait for the back analysis to see exactly how the river behaved, ' said Babtie managing director, Alex Macdonald.

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