AWMA’s Fish Exclusion Screen Solution will provide New Zealand’s Rangitata Diversion Race (RDR) with 374m2 of screening surface.
The Diversion Race is a 67 km long channel which diverts water from the South Island’s Rangitata River for irrigation, stock water and hydropower generation.
AWMA were awarded the design and construct contract to supply a diversion screen solution that will deliver required flows whilst excluding sporting and native fish.
In order to accommodate large flows exceeding 2850 ML/d (33m3/s), the RDR project requires seven stainless steel Self-Cleaning Cylindrical T-Screens each of 2.1m diameter and 8m in length, weighing over 6 tonnes each. As well as, one Self-Cleaning Flat Screen 3.5m high and 30m long.
This presents a total 374m2 screening area of 2mm stainless steel wedge wire screen, over 86m in length with infrastructure weighing in excess of 100 tonne.
A fish bypass will return fish safely back into the river. Manufacture began in October 2020, the structure is due to be commissioned in October 2021.
AWMA Fish Exclusion Screen Solutions are guided by the USEPA 316(b) compliant design requirements and the NIWA Fish Screening: good practice guidelines for Canterbury. Innovative screening technologies are available for numerous applications, contact the AWMA Screen Team for further information.
