• Rangitata Race is 67km long extending from an intake on the Rangitata River at Klondyke to a discharge at Highbank on the Rakaia River.
  • Can carry a flow of approximately 30 cubic metres of water per second.
  • A second intake on the South Ashburton River can also divert approx 7 cubic metres per second of water (when available) into the RDR.
  • Three Community Irrigation Schemes, two hydroelectric power stations, Ashburton District Council stockwater race system and various private stockwater and irrigation schemes are supplied by the race.
  • Irrigation has priority of supply during the irrigation season extending from September 10th to May 9th each year.
  • During the rest of the year, Highbank power station located at the Rakaia end of the race. Has priority of supply.
  • The other power station, Montalto, is located 1.5kms downstream from the Mayfield-Hinds Irrigation Scheme.
  • Major control structures built along the race include the Rangitata intake and sandtrap, checkgates, spillways and siphons passing under rivers and streams which cross the race.
  • In total the RDR supplies irrigation to approximately 66,000ha of land during the irrigation season.
  • It was officially opened in 1945, but wasn't in its present form until 1982 when the Montalto Power station was built.
  • It is New Zealand’s largest irrigation scheme.