Lake Ohakuri

Lake Ohakuri
	View from the dam to the southeast of Lake Ohakuri
Location:	North of the city of Taupo in the Waikato region , North Island , New Zealand
Tributaries:	Waikato River
Drain:	Waikato River
	New Zealand
Coordinates	38 ° 24 '56 " S , 176 ° 7' 5" E Coordinates: 38 ° 24 '56 " S , 176 ° 7' 5" E
	Data on the structure
Lock type:	Gravity dam
Construction time:	1956-1961
Height of the barrier structure :	51.8 m
Crown length:	94.5 m
Crown width:	9 m
Base width:	335 m
Power plant output:	112 MW
Operator:	Mercury NZ Limited
	Data on the reservoir
Altitude (at congestion destination )	285.1 m - 287.53 m
Water surface	12.9 km²
Reservoir length	11 km u. 14 km
Reservoir width	30 - 2030 m
Maximum depth	40 m
Catchment area	1 528 km²

The Lake Ohakuri is the river system of the Waikato River belonging Reservoir on the North Island of New Zealand . It is the second of a total of eight reservoirs that line up between Lake Taupo and the city of Cambridge on a section of the Waikato River .

Origin of name

In the Māori language, the name Ohakuri is composed of the guards “ oha ” for “souvenir” or “memory” and “ kuri ” for “dog” . The name could thus refer to a valuable coat made of dog fur.

geography

The 12.9 km ² large Lake Ohakuri is located around 26 km north of the city of Taupo . The reservoir consists of two arms, one that extends in the valley of the former river bed of the Waikato River and has a length of around 11 km and the second arm, which consists of the former river bed of the Whirinaki Stream and extends over around 11 km to Meanders northeast into the mountain landscape. The width of the arms vary between 30 and 880 m, with the lake measuring 2030 m at its widest, where the two arms meet. The height of the lake varies depending on the water level between 285.1 m and 287.53 m, with a maximum lake depth of 40 m. Its immediate water catchment area is 1528 km ² .

The reservoir can be reached from a small country road that branches off the New Zealand State Highway 1 and leads directly to the dam and the lake's power station.

Administratively, the lake belongs to the Waikato region .

The Lake Ohakuri follow one after the other reservoirs, Lake Atiamuri , Lake Whakamaru , Lake Maraetai , Lake Waipapa , Lake Arapuni and Lake Karapiro , the Lake Aratiatia precedes him.

history

The reservoir and the associated Ohakuri hydroelectric power station went into operation in 1961 and was designed for a nominal output of 90 MW .

The lake filled only 14 days in January / February 1961. Two thirds of the Orakei Korako geothermal area was flooded and the two geysers Minquini Geyser and Orakei Korako Geyser were lost forever.

As of 2020, the operator of the hydropower plant is the majority state-owned company Mercury NZ Limited .

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 5, 2020 .
↑ 03. Ohakuri - Overview . Mighty River Power , archived from the original on June 10, 2011 ; accessed on January 6, 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 5th, 2020
^ Waikato Lake Levels . Mercury NZ Limited , accessed January 5, 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 5, 2020 .
↑ 03. Ohakuri . Mighty River Power , archived from the original on June 20, 2011 ; accessed on January 5, 2020 (English, original website no longer available).
↑ Gregory Jones : 03. Ohakuri . Minority Geoscience Program, University of New Orleans , 2006, archived from the original on April 14, 2009 ; accessed on September 25, 2013 (English, original website no longer available).

[LINZ_Topo_Maps-1] Topo maps . Land Information New Zealand , accessed January 5, 2020 .

[Ohakuri_Overview-2] 03. Ohakuri - Overview . Mighty River Power , archived from the original on June 10, 2011 ; accessed on January 6, 2020 (English, original website no longer available).

[EW_Report_2010_S3-3] A ^b Edwards, Winton, Clayton : Assessment of the ecological condition of lakes in the Waikato region using LakeSPI - 2010 . 2010, p. 3 .

[Google_Earth-4] Coordinates and longitudes were determined using Goggle Earth Pro Version 7.3.2.5776 on January 5th, 2020

[Mercury_Lake_Level-5] Waikato Lake Levels . Mercury NZ Limited , accessed January 5, 2020 .

[Magadza_1979_S572-6] Magadza : Physical and chemical limnology of six hydroelectric lakes on the Waikato River, 1970-72 . 1979, p. 572 .

[Mercury_Hydro-7] Hydro Generation . Mercury NZ Limited , accessed January 5, 2020 .

[Hydro_Station_Ohakuri-8] 03. Ohakuri . Mighty River Power , archived from the original on June 20, 2011 ; accessed on January 5, 2020 (English, original website no longer available).

[Jones_2006-9] Gregory Jones : 03. Ohakuri . Minority Geoscience Program, University of New Orleans , 2006, archived from the original on April 14, 2009 ; accessed on September 25, 2013 (English, original website no longer available).