Hydrologist tells court how railway line worsened 2011 flood

A HYDROLOGIST has explained to the Grantham Commission of Inquiry how he came to conclude a railway line worsened the 2011 flood event.

Dr John Macintosh concluded the 2m-high railway embankment running through the town blocked the path of floodwater, increasing peak flood flow intensities.

His detailed report was leaked last week before being tendered into evidence when the commission resumed this week.

Dr Macintosh used numerous sources and computer modelling to compile his report, including residents' videos, photos and data from a registered surveyor.

Dr Macintosh outlined in detail to the commission on Tuesday the science behind water flow rates and the velocity of water at the peak of the flood.

"Between the quarry and the levee there was 4.6 gigalitres (4.6 billion litres) of water flowing at the time," he said.

"That area, compared with the actual flood plain, is about 3m deeper.

"The flow and volume of water in that region had the ability to move a tractor sideways."

Commissioner Walter Sofronoff asked all parties to agree on a timeline for written and oral submissions taking into account a final report was due at the end of next month.

The inquiry is expected to hear from two more witnesses on Wednesday before wrapping up. - APN NEWSDESK.

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