Water in New Zealand and are of varying types and origins. Many of the lakes in the central North Island area are volcanic crater lakes, while the majority of the lakes near the Southern Alps were carved by glaciers. Hydroelectric reservoirs are common in South Canterbury, Central Otago and along the Waikato River. Over 180,000 kilometres of rivers has been mapped in New Zealand, the longest being the Waikato River with a length of 425 kilometres and the largest river by volume is the Clutha River with a mean discharge of 533 cubic metres per second. New Zealand has many notable waterfalls, some of
Hutt River (New Zealand) the Ewen Bridge down to the Waione Bridge and back. The river was named "Hutt" after Sir William Hutt, chairman of the New Zealand Company. Early Māori residents, such as Ngāi Tara, called it Te Awakairangi. Later Māori settlers named it Te Wai o Orutu after Orutu, a Ngāti Mamoe ancestor. By the time European settlers arrived, Māori called it Heretaunga, a name adopted by an Upper Hutt suburb and secondary school. The river has a good stock of brown trout. Hutt River (New Zealand) The Hutt River (Māori:"Te Awakairangi", "Te Wai o Orutu" or "Heretaunga") flows through the southern