page_title: Rangitata Diversion Race
section_title: Siphons
hierarchical_section_title: Rangitata Diversion Race / Original construction features / Siphons
caption_attribution_description: English: This image forms part of a series showing aspects of the canal and associated structures that were constructed to divert water from the Rangitata river for irrigation and power generation purposes. The canal terminates at the Highbank power station which releases the water into the Rakaia river.
context_page_description: The Rangitata Diversion Race or RDR is a combined irrigation and power generation scheme that diverts water from the Rangitata River to irrigate over 100,000 hectares of farmland in Mid-Canterbury, New Zealand.The RDR project was the first major river diversion in New Zealand, and the largest irrigation scheme in the country. It was originally constructed by the Public Works Department between 1937 and 1944. The main canal is 67 km long, 10 m wide and 3 m deep.
  The RDR supplies three community irrigation schemes, two hydroelectric power stations, the Ashburton District Council stockwater race system and various private stockwater and irrigation schemes.
context_section_description: The RDR canal passes beneath the North and South branches of the Ashburton River in siphons constructed from large concrete pipe sections.
caption: Siphon at South Branch of Ashburton River
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