Implemented, but failed
'A few chains west of the present opening site' (Dalmer, 1970).
Description of option
This pile-supported pipe culvert had a flap at the seaward end. The piles were 30 ft long at the seaward end but, approximately 8 years after it failed, Dobson commented that 50 ft piles would be necessary. The dimensions of the culvert are unknown.
Opening, closing, and lake level control description
Allows continuous low discharge, attempts to keep lake at a constant (relatively low) level.
below 50 cumecs
It only operated for 7 months before the structure was damaged and undermined by heavy seas. Susceptible to scouring of piles.
Construction cost = 7,200 pounds in 1904
Fish passage benefit rating
Potential running impacts or benefits