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Lakes Of New Zealand
There are 3,820 lakes in New Zealand that have a surface area larger than one hectare. Many of the lakes in the central North Island are volcanic crater lakes. The majority of the lakes near the Southern Alps / Kā Tiritiri o te Moana were carved by glaciers. Artificial lakes created as hydroelectric reservoirs are common in South Canterbury, Central Otago and along the Waikato River. Statistics *Largest lake: Lake Taupō – *Deepest lake: Lake Hauroko – 462 m There are: *41 lakes with a surface area larger than 10 km2 (1000 ha) *229 lakes greater than 0.5 km2 (50 ha) *3820 lakes greater than 0.01 km2 (1 ha) Pollution A trophic level index is used as a measure of the pollution levels of lakes in New Zealand. Based on the monitoring of 134 lakes it is estimated that one third of New Zealand lakes have high nutrient levels or have poor water quality. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tongariro River Mouth
Mount Tongariro (; ) is a compound volcano in the Taupō Volcanic Zone of the North Island of New Zealand. It is located to the southwest of Lake Taupō, and is the northernmost of the three active volcanoes that dominate the landscape of the central North Island. Geology Mount Tongariro is part of the Tongariro volcanic centre, which consists of four massifs made of andesite: Tongariro, Kakaramea-Tihia Massif, Pihanga, and Ruapehu at the southern end of the North Island Volcanic Plateau. The andesitic eruptions formed Tongariro, a steep stratovolcano, reaching a height of . Tongariro is composed of layers of both lava and tephra and the eruptions that built the current stratovolcano commenced about 275,000 years ago. Tongariro consists of at least 12 cones. Ngāuruhoe, while often regarded as a separate mountain, is geologically a cone of Tongariro. It is also the most active vent, having erupted more than 70 times since 1839, the last episode in 1973 to 1975. Activity ha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Waikato River
The Waikato River is the longest river in New Zealand, running for through the North Island. It rises on the eastern slopes of Mount Ruapehu, joining the Tongariro River system and flowing through Lake Taupō, New Zealand's largest lake. It then drains Taupō at the lake's northeastern edge, creates the Huka Falls, and flows northwest through the Waikato Plains. It empties into the Tasman Sea south of Auckland, at Port Waikato. It gives its name to the Waikato region that surrounds the Waikato Plains. The present course of the river was largely formed about 17,000 years ago. Contributing factors were climate warming, forest being reestablished in the river headwaters and the deepening, rather than widening, of the existing river channel. The channel was gradually eroded as far up river as Piarere, leaving the old Hinuera channel through the Hinuera Gap high and dry. The remains of the old course are seen clearly at Hinuera, where the cliffs mark the ancient river edges. The Wai ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Dams And Reservoirs In New Zealand
Many of the largest dams and reservoirs in New Zealand have been developed principally to produce hydroelectricity. Other uses include irrigation and municipal water supply. Hydro-electric dams The main river systems comprising a series of dams and powerhouses are situated on the following rivers: :The Waikato River :The Waitaki River :The Clutha River Other schemes are standalone developments associated with specific sites. Tongariro Power Scheme The Tongariro Power Scheme (1,400 GWh) diverts water from the south side of Mount Ruapehu and the west and north sides of Tongariro into Lake Taupō, and thus eventually into the Waikato River. *Rangipo (cavern) (120 MW) * Tokaanu (240 MW) * Moawhango Dam The Waikato The hydro stations, starting from Lake Taupō, are (capacity in MW and nominal annual energy output in GWh): * Aratiatia (84 MW) (331 GWh) * Ohakuri (112 MW) (400 GWh) * Atiamuri (84 MW) (305 GWh) *Whakamaru (100 MW) (486 GWh) *Maraetai (360 MW) (855 GWh) * Waipapa (5 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Water In New Zealand
Water is relatively abundant in New Zealand due to the temperate climate and maritime weather patterns. In recent years, water pollution and draw-down of aquifers have become important environmental issues in New Zealand. Waters in New Zealand In New Zealand, there are more than of rivers and streams and about 4,000 lakes and over 200 underground aquifers. Annual water flow is 145 million litres per person. The reliable supply of good water is an important economic advantage for New Zealand, but its quality and availability is declining. Lakes There are 3,820 lakes in New Zealand with a surface area larger than , 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. Rivers and streams Over of rivers has been mapped in New Zealand, the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rivers Of New Zealand
The rivers of New Zealand are used for a variety of purposes and face a number of environmental issues. In the North Island's hill country the rivers are deep, fast flowing and most are unnavigable. Many of the rivers in the South Island are braided rivers. The navigable rivers were used for mass transport in the early history of New Zealand. Statistics The longest river in New Zealand is the Waikato River with a length of . The largest river by volume is the Clutha River / Mata-Au with a mean discharge of . The shortest river is claimed to be the Tūranganui River in Gisborne at long. Some of the rivers, especially those with wide flood plains and stop banks, have long road bridges spanning them. The Rakaia River is crossed by Rakaia Bridge, the longest bridge in New Zealand at . The third longest bridge is the Whirokino Trestle Bridge on State Highway 1 crossing the Manawatū River. Over of rivers have been mapped in New Zealand. Uses Before colonisation, Māori fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trophic Level Index
The trophic level index (TLI) is used in New Zealand as a measure of nutrient status of lakes. It is similar to the trophic state index but was proposed as alternative that suited New Zealand. The system uses four criteria, phosphorus and nitrogen concentrations, as well as visual clarity and algal biomass weighted equally. See also * Water pollution in New Zealand * Lakes of New Zealand *Environment of New Zealand The environment of New Zealand is characterised by an endemic flora and fauna which has evolved in near isolation from the rest of the world. The main islands of New Zealand span two biomes, temperate and subtropical, complicated by large mount ... External linksNew Zealand Ministry for the Environment- Trophic Level Index for lakesDefinitions of the 5 trophic states - Oligotrophic, Mesotrophic, Eutrophic, Supertrophic and Hypertrophic lakes References Water in New Zealand Water pollution {{NewZealand-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Taupō
Lake Taupō (also spelled Taupo; mi, Taupō-nui-a-Tia or ) is a large crater lake in New Zealand's North Island, located in the caldera of the Taupō Volcano. The lake is the namesake of the town of Taupō, which sits on a bay in the lake's northeastern shore. With a surface area of , it is the largest lake by surface area in New Zealand, and the second largest freshwater lake by surface area in geopolitical Oceania after Lake Murray in Papua New Guinea. Motutaiko Island lies in the southeastern area of the lake. Lake Taupō has a perimeter of approximately and a maximum depth of . It is drained by the Waikato River (New Zealand's longest river), and its main tributaries are the Waitahanui River, the Tongariro River, and the Tauranga Taupō River. It is a noted trout fishery with stocks of introduced brown and rainbow trout. The level of the lake is controlled by Mercury Energy, the owner of the eight hydroelectric dams on the Waikato River downstream of Lake Taupō, usin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Central Otago
Central Otago is located in the inland part of the Otago region in the South Island of New Zealand. The motto for the area is "A World of Difference". The area is dominated by mountain ranges and the upper reaches of the Clutha River and tributaries. The wide flat plateau of the Maniototo which lies between the upper reaches of the Taieri River and the Clutha's northern tributary the Manuherikia River, Manuherikia is also part of Central Otago. Characterised by cold winters and hot, dry summers, the area is only lightly populated. First significant European occupation came with the discovery of gold at Gabriel's Gully near Lawrence, New Zealand, Lawrence in 1861, which led to the Central Otago goldrush. Other towns and villages include Alexandra, New Zealand, Alexandra, Bannockburn, New Zealand, Bannockburn, Clyde, New Zealand, Clyde, Cromwell, New Zealand, Cromwell, Millers Flat, New Zealand, Millers Flat, Naseby, New Zealand, Naseby, Omakau, Ranfurly, New Zealand, Ranfurly, Rox ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fiordland Lake Marian
Fiordland is a geographical region of New Zealand in the south-western corner of the South Island, comprising the westernmost third of Southland. Most of Fiordland is dominated by the steep sides of the snow-capped Southern Alps, deep lakes, and its steep, glacier-carved and now ocean-flooded western valleys. The name "Fiordland" comes from a variant spelling of the Scandinavian word for this type of steep valley, "fjord". The area of Fiordland is dominated by, and very roughly coterminous with, Fiordland National Park, New Zealand's largest National Park. Due to the often steep terrain and high amount of rainfall supporting dense vegetation, the interior of the Fiordland region is largely inaccessible. As a result, Fiordland was never subjected to notable logging operations, and even attempts at whaling, seal hunting, and mining were on a small scale and short-lived, partly also because of the challenging weather. Today, Fiordland contains by far the greatest extent of un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
South Canterbury
South Canterbury is the area of the Canterbury Region of the South Island of New Zealand bounded by the Rangitata River in the north and the Waitaki River (the border with the Otago Region) to the south. The Pacific Ocean and ridge of the Southern Alps / Kā Tiritiri o te Moana form natural boundaries to the east and west respectively. Though the exact boundaries of the region have never been formalised, the term is used for a variety of government agencies (e.g., the South Canterbury District Health Board) and other entities (such as the South Canterbury provincial rugby team). It is one of four traditional sub-regions of Canterbury, along with Mid Canterbury, North Canterbury, and Christchurch city. Geography South Canterbury's geography covers a wide range of different terrains, from alpine slopes across the glacier carved lakes Tekapo and Pukaki and high country basin of the Mackenzie Country to undulating lowland hills and the Canterbury Plains. Sheep farming is an import ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Southern Alps
The Southern Alps (; officially Southern Alps / Kā Tiritiri o te Moana) is a mountain range extending along much of the length of New Zealand's South Island, reaching its greatest elevations near the range's western side. The name "Southern Alps" generally refers to the entire range, although separate names are given to many of the smaller ranges that form part of it. The range includes the South Island's Main Divide, which separates the water catchments of the more heavily populated eastern side of the island from those on the west coast. Politically, the Main Divide forms the boundary between the Marlborough, Canterbury and Otago regions to the southeast and the Tasman and West Coast regions to the northwest. Names The Māori name of the range is , meaning "the Mirage of the Ocean". The English explorer James Cook bestowed the name ''Southern Alps'' on 23 March 1770, admiring their "prodigious height". p. 384. They had previously been noted by Abel Tasman in 1642, whose ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
