The Waikato River (North Island), Waitaki and Clutha Rivers (South Island) have all been extensively dammed. The Waikato River begins at the outlet of Lake Taupo, the Waitaki River receives water from three main glacial-formed lakes where water levels are controlled, and the main inputs to the Clutha River also arise via glacial-formed lakes; Wanaka, Wakitipu, and Hawea. Some statistics relating to these three hydroelectric dams are given below.
• Eight dams in series on the Waikato River, New Zealand's longest river system.
• Eight power stations on the Waitaki River including three artificial lakes, three natural lakes where water levels are regulated artificially for power generation, and a series of artificial canals.
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