Permanent opening - 500m mole (Mr Langbein's plan)

Year proposed



  Not implemented

Location description


Description of option

  A permanent opening consisting of a mole bypassing gravel around the opening was proposed. This design used the Timaru experience as a guide and was designed with the mole extending seaward for 25 chains (500m). Provisions were included for an extension to the mole to be under taken in future if necessary.

Opening, closing, and lake level control description

  Permanent opening.

Maximum discharge


Maintenance/Management description


Cost description

  1932 cost: 110,000 pounds (using rock from Birdlings Flat run along the spit on a tramway)

Fish passage benefit rating


Potential running impacts or benefits