Wivenhoe Dam manual 'not a priority in the field'
- From: The Australian
- February 07, 2012
FOLLOWING Wivenhoe Dam's manual was ''not a priority for operating in the field'' ahead of Brisbane's devastating flood, according to Seqwater's dam
manager.
Queensland's flood, after The Australian revealed a string of inconsistencies in the flood engineers' evidence suggesting they disregarded the manual and used the wrong-flood mitigation strategy in the days before Brisbane was swamped.
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Giving evidence this morning, SEQWater dam operations manager Rob Drury continued
to be grilled over an email he authored to a colleague at 8.23am on January 10, saying the dam was implementing a release strategy known as ''W2''.
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The official history, branded ''a fiction'' by counsel assisting Peter Callaghan SC, said the dam moved to strategy W3 two days earlier, bypassing W2 completely.
Mr Drury said: ''I didn't mean to be wrong at the time and didn't intend to be. But if the documents show it was not right, then I was wrong.''
Barrister Jim Murdoch SC, for mid-Brisbane River irrigators, then asked: ''As a senior professional, if you were wrong on that it's a humiliating error, isn't it?''
Mr Drury replied: ''The W-strategies were a priority for operating in the field. Me saying the wrong W strategy was purely off the top of my head, me saying what I thought at the time. The strategies, the releases, the (situation reports) were all the important things. There certainly wasn't comment on W-strategies though, because they were not at the time a priority nor a necessity.'
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Under the Wivenhoe manual, the engineers must always implement one of four strategies from the manual, ranging from limited releases that preserve downstream rural infrastructure, known as W1, to intensive releases to ensure the integrity of the dam, known as W4.
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Operators are saved from financial liability for damage caused by releases if they follow the manual, which prescribes environmental triggers before for each strategy can be implemented.
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Mr Drury denied knowing the email was inconsistent with the official report until he read it in The Australian last month.
The inquiry continues.
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