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During the 1990s and 2000s dairy farming expanded into drier regions such as Canterbury. In these areas dairy farms need irrigation to grow enough pasture to feed the cows. This has increased the demand for water from rivers and streams and depleted their flow.
Te whakamahi i tēnei tūemi
Reference: DCDL-0001322
by Tom Scott
Permission of the Alexander Turnbull Library, National Library of New Zealand, Te Puna Mātauranga o Aotearoa, must be obtained before any re-use of this image.