Open channel through Halswell to Avon-Heathcote Estuary
Northern Lake Ellesmere up through to the Halswell River. Bray (1875) Scheme No. 1 (see designs/drawings figure).
Description of option
A 15 mile (24.1 km) open channel cut was proposed from the north of Lake Ellesmere up through to the Halswell River - effectively reversing it.
Opening, closing, and lake level control description
Allows continuous discharge. Requires a higher lake level to obtain suitable hydraulic gradient.
below 50 cumecs
Cost for 15 miles of cutting: 1,245,600 pounds (Bray, 1875).
Fish passage benefit rating
Potential running impacts or benefits
The fall required over 24.1 km cut is far too great to prevent a rising of the lake level during a flood, even with the greater head available in 1875. Scheme more "one for preventing the drainage of the lake" (Bray, 1875).