The flume at Papakaio between tunnels 1 and 2

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Comments (1)

Bruce Comfort on September 30, 2011

This is the second shortest aqueduct on the race. Just 12 feet long on McLeod's original drawings and between tunnels 1 and 2, like all the aqueducts it would have originally been rectangular open top box section and made from Kauri (wood) It has no intermediate supports and spans side to side over an unnamed creek which tumbles through a limestone gorge downstream. The drawings prepared by Donald McLeod for this aqueduct and the two tunnels nearby (that is the downstream portal of tunnel 1 in the photo) are derived from McLeod's very accurate and sophisticated survey plans. His drawings show the aqueduct and the two short sections of the race upstream of it out of tunnel 1 and downstream of it towards the intake of tunnel 2 - here seen lined with limestone blocks as drawn by the designer.

Had the survey been inaccurate or the construction of the race defective, this short aqueduct would have of necessity been longer - if the race was too elevated at this point or shorter (possibly non existent or at the same level as the stream which would have been very hard to deal with) had the race been set too low.

The fact that it is exactly as designed is a tribute to the surveying and the construction - considering survey instruments were quite unsophisticated in 1876 - 77 when the survey was done.

On the farm on which this aqueduct is situated is a small open fronted implement shed partly made from Kauri planks with tar on them. These planks will almost certainly come from the original flume when it was replaced by the half round steel in the 1940s.

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Photo details

  • Uploaded on September 26, 2009
  • Attribution-Noncommercial-No Derivative Works
    by Bruce Comfort
    • Camera: OLYMPUS IMAGING CORP. FE230/X790
    • Taken on 2009/03/24 15:08:11
    • Exposure: 0.008s (1/125)
    • Focal Length: 13.30mm
    • F/Stop: f/4.900
    • ISO Speed: ISO50
    • Exposure Bias: 0.00 EV
    • No flash

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