Opening - pre 1868
Implemented for a defined
Description of option
The manual opening of the most westerly part of the lake every 2-3 years using digging sticks to prevent flooding of the Taumutu Pa. Lake levels at this time were potentially much greater with a head of 3+m or 8-9 feet above mean sea level (Harris, 1947). Prior to 1840 "According to legend when Lake Ellesmere was very high it was let out at the most westerly part of the lake by some hundreds of Maoris using flax sticks to scrape a narrow channel across the spit to the sea. It is stated that the fort then existing upon the site now occupied by the native church at Taumutu was surrounded by water" (Harris, 1947).
Opening, closing, and lake level control description
Lake was opened to prevent flooding of Taumutu Pa (approx every 2 yrs/ lake levels of order of 8-9 feet above msl), and to allow for eel & flounder migration at key times throughout the year.
above 300 cumecs
Fish passage benefit rating
Potential running impacts or benefits