just a bit of catarqact dam history...
Quote:
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The dam was completed in 1907 and cost about $1.3 million. When Cataract filled to capacity for the first time in January 1911, it soon became clear that the spillway should be widened to prevent any risk of floodwaters overtopping the dam wall. This work was completed in 1915. In 1968 a large flood saw the water level climb 1.5 metres overnight reaching 75mm below the walkways across the wall. About 150 million litres of water were discharged out of the old spillway.
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now look where the level is!
