The South Island of New Zealand witnessed a revolution in irrigation system installation last year through a $30 million project to extrude pipe up to 1.6-m in diameter onsite.
Historically the irrigation water for the farms in the mid Canterbury area of New Zealand's South Island has been supplied through open channels. This particular scheme, called the Valetta Irrigation project receives its water from the Rangitata Diversion Race, which is a canal constructed in the early part of the 20th century taking water from the Rangitata River. However the open channel system loses a large amount of water due to seepage and evaporation. In this case it was calculated that a piped irrigation system would deliver water savings of 28% and enable 37% more land to be irrigated without increasing the level of water extraction.