Selwyn River
Selwyn River / Waikirikiri
Selwyn River near Dunsandel, November 2017
Selwyn River is located in New Zealand
Selwyn River
Location of the mouth within New Zealand
EtymologyTranslates as "gravelly water", and named after Bishop Selwyn.
Native nameWaikirikiri (Māori)
Location
CountryNew Zealand
Physical characteristics
Source 
 • locationSouthern Alps
Mouth 
 • location
Lake Ellesmere / Te Waihora
Length80 km (50 mi)

The Selwyn River (Māori: Waikirikiri, officially gazetted as Selwyn River / Waikirikiri) flows through the Selwyn District of Canterbury in the South Island of New Zealand.[1]

Description

Result of flooding on the Selwyn River - Glentunnel (June 2021)
The River Walk, where the Wairiri Stream meets the Selwyn River. This is 210 metres downstream from the photo above (November 2019)

The river has its source in the Southern Alps and flows east for 80 kilometres (50 mi) before emptying into Lake Ellesmere / Te Waihora, south of Banks Peninsula. Terrace cliffs above the river's upper reaches gave the town of Whitecliffs its name.

For much of its course the river flows through wide shingle channels. In drought years, the river can disappear beneath this bed and seem to dry up completely. This frequently occurs where State Highway 1 crosses the river at the settlement of Selwyn, about 20 kilometres (12 mi) upstream from its outflow into Lake Ellesmere.

In the foothills, the Selwyn flows year-round. On the plains, the riverbed is highly permeable, and the river overlays a deep and porous aquifer. As soon as the river reaches the plains, water begins leaking down through the bed and into the aquifer. In most months, all river-water disappears within 5 kilometres (3 mi) of leaving the foothills. The next 35 kilometres (22 mi) of the river remains dry for most of the year, apart from a small section around the confluence with the permanently flowing Hororata River. About 15 kilometres (9 mi) upstream from Lake Ellesmere shallow groundwater rises back to the surface, and the Selwyn becomes permanent again.

Bridges

There are six bridges that cross the Selwyn River. These are at: Whitecliffs (Whitecliffs Road), Glentunnel (SH 77), Coalgate (Hororata Road), Hororata (Bealey Road), Selwyn (SH 1) and Irwell (Leeston Road). It is also possible to cross at Coes Ford when the river is not in flood. Chamberlains Ford is no longer a ford. The nearby Irwell bridge provides access to the other side of the river.[2]

Ecology

Disappearing river flows have significant ecological effects: when the river’s surface water disappears, so does the habitat for many aquatic plants and animals. In response to loss of surface water, aquatic invertebrates and fish must disperse, seek refuge in remnant aquatic habitats, or die. Aquatic plants, algae, and bacteria must form resting stages or die. The dry central reaches of the Selwyn River also constitute a significant barrier for dispersal of invertebrates and for fish migrating between Lake Ellesmere and the headwaters.[3]

Fishing

The Selwyn river was viewed historically as one of New Zealand’s best trout fisheries. In the 1960s a trout trap at Coes Ford was reported to count up to 14,000 returning spawning trout. In 2017, the numbers have declined to the stage that only dozens of trout could be counted when returning to spawn.[4] The fish in the river have been described as low in number and the majority of the fish are quite small.[5]

Pollution

The Canterbury Regional Council (ECan) has permitted intensive dairy farming around Selwyn and it has been suggested that this has led to a deterioration in the water quality of the Selwyn river.[6] In May 2021, it was reported that Nitrate levels in the Selwyn River has increased by 50%.

It is no longer recommended that people go swimming in the Selwyn River. Coes Ford was once a well known swimming spot in Canterbury.[7][8] The water at Coes Ford was reported to be in the worst 25% in New Zealand for total nitrate levels in 2020.[9] The pollution at Coes Ford is thought to come from Silverstream creek, which used surrounded by many of the dairy farms in the area.[10]

Chamberlain's Ford which crosses the Selwyn RIver had an algal bloom health warning issued in December 2020. There were benthic cyanobacteria found in the river.[11] Algal Blooms of benthic cyanobacteria have also been reported at in the Selwyn river at Whitecliffs Domain and Whitecliffs Road in March 2021.[12]

Greenpeace placed billboards in the Selwyn River to protest the degree of pollution in it in February 2020.[13]

Naming

The Selwyn River and its gorge were named in 1849 by the chief surveyor of the Canterbury Association, Joseph Thomas, for Bishop Selwyn. The name was later adopted for the township, the district, and an electorate.[14]

The New Zealand Ministry for Culture and Heritage gives a translation of "gravelly stream" for Waikirikiri.[15]

References

  1. ↑ "Place name detail: Selwyn River/Waikirikiri". New Zealand Gazetteer. New Zealand Geographic Board. Retrieved 5 April 2008.
  2. ↑ "Selwyn District Council". Selwyn District Council. Retrieved 16 May 2021.
  3. ↑ Mike Scarsbrook; Scott Larned; Graham Fenwick; Dave Kelly. "Biodiversity in a disappearing river". NIWA. Archived from the original on 23 February 2013. Retrieved 22 March 2013.
  4. ↑ "Welcome To The Future – Popular Family Swimming Spot Dries Up | Fish & Game NZ". Fish & Game. Retrieved 16 May 2021.
  5. ↑ "Selwyn River". nzfishing.com. Retrieved 16 May 2021.
  6. ↑ "Nitrates in Selwyn River up 50% in 22 months, Federation of Freshwater Anglers says". NZ Herald. Retrieved 16 May 2021.
  7. ↑ "Where we used to swim: The turning point for Canterbury's Selwyn River". Stuff. 5 January 2020. Retrieved 16 May 2021.
  8. ↑ "Selwyn". Swimmable Rivers. Retrieved 16 May 2021.
  9. ↑ "Water quality data reveals a 'very mixed bag' for Canterbury rivers". Stuff. 28 September 2020. Retrieved 16 May 2021.
  10. ↑ "Where we used to swim: The turning point for Canterbury's Selwyn River". Stuff. 5 January 2020. Retrieved 12 November 2021.
  11. ↑ "Health Warning Removed For Algal Bloom In The Waikirikiri/ Selwyn River At Chamberlains Ford". www.scoop.co.nz. 2 February 2021. Retrieved 16 May 2021.
  12. ↑ "Health Warning Removed For Algal Bloom In The Selwyn/Waikirikiri River At Whitecliffs Domain And Whitecliffs Road". www.scoop.co.nz. 5 March 2021. Retrieved 16 May 2021.
  13. ↑ "Three billboards protest pollution in Canterbury's Selwyn River". Stuff. 13 February 2020. Retrieved 16 May 2021.
  14. ↑ Reed, A. W. (2010). Peter Dowling (ed.). Place Names of New Zealand. Rosedale, North Shore: Raupo. p. 362. ISBN 9780143204107.
  15. ↑ "1000 Māori place names". New Zealand Ministry for Culture and Heritage. 6 August 2019.

43°45′S 172°26′E / 43.750°S 172.433°E / -43.750; 172.433

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.