The people who designed, wrote, checked and then erected this Tourist Information Board at Contact Energy's Clyde Hydro may have been asleep at the wheel.
The person responsible has acknowledged her reliance on a few checks by others in the Company.
A quick calculation will tell you that the penstocks must weigh at least 85 tonnes - on the dimensions given, and probably a fair bit more than that.
AND 220 cumecs is 220,000 litres of water a second.
Contact energy is the beneficiary and the custodian of a lot of historic high quality engineering design and construction. They also operate the second biggest hydro dam in New Zealand - one which has as its holding lake billions of tons of water poised above Clyde and Alexandra townships. They should give us more confidence in their abilities, than this sign suggests.
The old guys from the Ministry of Works and the New Zealand Electricity Departments would be saddened to see the outcome of their heritage works treated like this.
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Photo taken in Clyde, New Zealand
Misplaced? Suggest new location