This is one of the few in-reservoir structures that is not plastered, so it may have been erected after the construction period around 1910. It is a small weir with overflow falling vertically into pipework that is buried in the bund - so some sort of overflow must have been constructed at this place as the bund was built up - it may have been an open vertical tube - these are notoriously less efficient at spilling water than a horizontal weir.
The rim of the bund is up just 600 above the weir - sufficient to have "caught" most but not all of the waves on the surface if the reservoir was full on a windy day!
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Photo taken in Centennial Park, Otipua Creek 7974, New Zealand
Misplaced? Suggest new location