Lake Maraetai
| Lake Maraetai | |||||||||
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| Coordinates | 38 ° 26 '13 " S , 175 ° 50' 3" E | ||||||||
| Data on the structure | |||||||||
| Lock type: | Arch dam | ||||||||
| Construction time: | until 1952 and until 1970 | ||||||||
| Height of the barrier structure : | 87 m | ||||||||
| Crown length: | 133 m | ||||||||
| Crown width: | 11 m | ||||||||
| Base width: | 15.2 m | ||||||||
| Power plant output: | 360 MW | ||||||||
| Operator: | Mercury NZ Limited | ||||||||
| Data on the reservoir | |||||||||
| Altitude (at congestion destination ) | 184.98 m - 189.47 m | ||||||||
| Water surface | 4.12 km² | ||||||||
| Reservoir length | 8 kilometers | ||||||||
| Reservoir width | 60 - 1150 m | ||||||||
| Maximum depth | 68 m | ||||||||
| Catchment area | 572 km² | ||||||||
The Lake Maraetai is the river system of the Waikato River belonging Reservoir on the North Island of New Zealand .
Origin of name
In the Māori language, the name “ Maraetai ” is composed of the words “ marae ” for “open area” or “courtyard” in front of a wharenui (meeting house) and “ tai ” for the “sea” or “coast” . Therefore the name probably comes from some coast. As an example, there is a Maraetai southeast of Auckland at Waitemata Harbor .
geography
The 4.12 km² large Lake Maraetai is located around 32 km north of Lake Taupo and around 15 km south of the city of Tokoroa , flanked by a hilly landscape up to 350 m high on its eastern side. The lake is 8 km long and varies in width between 60 and 1150 m. The main part of the reservoir extends in the valley of the former river bed of the Waikato River . Another four parts, however, extend into the eastern side valleys, which extend to the east in the central part of the reservoir. The longest arm here has a length of 2.7 km. The height of the lake varies depending on the water level between 184.98 m and 189.47 m, with a maximum lake depth of 68 m. Its immediate water catchment area is 588 km².
The reservoir can be reached via the New Zealand State Highway 32 , which flanks the water on its southeast side, and via the New Zealand State Highway 30 , which touches the lake on the southern part.
Administratively, the lake belongs to the Waikato region .
The Lake Maraetai follow one after the reservoirs Lake Waipapa , Lake Arapuni and Lake Karapiro , the reservoirs Lake Whakamaru , Lake Atiamuri , Lake Ohakuri and Lake Aratiatia go ahead of him.
history
The reservoir and the two associated hydropower plants were commissioned in 1952 and 1970. Together, the power plants generate most of the electricity of all power plants on the Waikato River and together have a nominal output of 360 MW . As of 2020, the operator of both hydropower plants is the majority state-owned company Mercury NZ Limited .
The small town of Mangakino , located in the left arch of the lake , was built in the 1940s for the construction workers of the dam and had 4,456 inhabitants four years after the construction was completed. It was bigger than the city of Taupo at the time . As of 2013, the place had only 744 inhabitants with an unemployment rate of 12.9%.
See also
literature
- CHD Magadza : Physical and chemical limnology of six hydroelectric lakes on the Waikato River, 1970-72 . In: New Zealand Journal of Marine and Freshwater Research . Vol. 13, Issue 4 , 1979, pp. 561-572 , doi : 10.1080 / 00288330.1979.9515835 (English).
- Tracey Edwards, Mary de Winton, John Clayton : Assessment of the ecological condition of lakes in the Waikato region using LakeSPI - 2010 . In: Environment Waikato (Ed.): Environment Waikato Technical Report . 2010/24 , June 2010, ISSN 1177-9284 (English).
Individual evidence
- ↑ a b c d Topo maps . Land Information New Zealand , accessed January 4, 2020 .
- ↑ 06. Maraetai - Overview . Mighty River Power , archived from the original on July 20, 2011 ; accessed on January 8, 2020 (English, original website no longer available).
- ^ A b Edwards, Winton, Clayton : Assessment of the ecological condition of lakes in the Waikato region using LakeSPI - 2010 . 2010, p. 3 .
- ↑ Coordinates and longitudes were determined using Goggle Earth Pro Version 7.3.2.5776 on January 4th, 2020
- ^ Waikato Lake Levels . Mercury NZ Limited , accessed January 4, 2020 .
- ↑ Magadza : Physical and chemical limnology of six hydroelectric lakes on the Waikato River, 1970-72 . 1979, p. 572 .
- ↑ Hydro Generation . Mercury NZ Limited , accessed January 4, 2020 .
- ↑ Malcolm McKinnon : Volcanic Plateau place - Geothermal and hydroelectric power . In: Te Ara - the Encyclopedia of New Zealand . Ministry for Culture & Heritage , May 25, 2015, accessed January 4, 2020 .
- ↑ Malcolm McKinnon : Volcanic Plateau place - North and west of Taupō . In: Te Ara - the Encyclopedia of New Zealand . Ministry for Culture & Heritage , May 25, 2015, accessed January 4, 2020 .