Dobson's Culvert

Year proposed

  1904

Status

  Implemented, but failed

Location description

  '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.

Maximum discharge

  below 50 cumecs

Maintenance/Management description

   It only operated for 7 months before the structure was damaged and undermined by heavy seas. Susceptible to scouring of piles.

Cost description

  Construction cost = 7,200 pounds in 1904

Fish passage benefit rating

  Low

Potential running impacts or benefits