Waimakariri River

{{Infobox river

| name = Waimakariri River

| name_native =

| name_native_lang =

| name_other =

| name_etymology = From Māori {{lang|mi|wai}} (water) and {{lang|mi|makariri}} (cold)

| image = Waimakariri03_gobeirne.jpg

| image_size = 270px

| image_caption = View of the Waimakariri River looking towards the Southern Alps

| map = {{Maplink|frame=yes|type=line|plain=yes|zoom=8|frame-align=center|frame-width=270|frame-height=270|stroke-color=#0000ff|stroke-width=2}}

| map_size = 270px

| map_caption = Interactive map of the Waimakariri River

| pushpin_map =

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| subdivision_type1 = Country

| subdivision_name1 = New Zealand

| subdivision_type2 = Region

| subdivision_name2 = Canterbury

| length = {{convert|151|km|mi|abbr=on}}

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| discharge1_avg = {{convert|76|m3/s|cuft/s|abbr=on}}

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| source1 = Southern Alps, near Mount Rolleston

| source1_location = Southern Alps, Canterbury

| source1_coordinates= {{coord|42|54|13|S|171|29|48|E|display=inline}}

| source1_elevation = {{convert|1535|m|abbr=on}}

| mouth = Brooklands Lagoon, Pacific Ocean

| mouth_location = near Kaiapoi

| mouth_coordinates = {{coord|43|23|26|S|172|42|29|E|display=inline,title}}

| mouth_elevation = {{convert|0|m|abbr=on}}

| progression =

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| tributaries_left = Bealey River, Poulter River, Esk River, Eyre River, Kaiapoi River

| tributaries_right = White River, Broken River, Kowai River, Styx River

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The Waimakariri River is one of the largest rivers in Canterbury, on the eastern coast of New Zealand's South Island. It flows for {{convert|151|km|mi}} in a generally southeastward direction from the Southern Alps across the Canterbury Plains to the Pacific Ocean.

The river rises on the eastern flanks of the Southern Alps, eight kilometres southwest of Arthur's Pass. For much of its upper reaches, the river is braided, with wide shingle beds. As the river approaches the Canterbury Plains, it passes through a belt of mountains, and is forced into a narrow canyon (the Waimakariri Gorge), before reverting to its braided form for its passage across the plains. It enters the Pacific north of Christchurch, near the town of Kaiapoi.

Instead of being unoccupied Crown land as are most New Zealand river beds, the bed of the Waimakariri River is vested in the Canterbury Regional Council (Environment Canterbury).Waimakariri River Improvement Act 1922, [http://www.legislation.govt.nz/act/local/1922/0022/latest/DLM42599.html Section 17(1)] – Parliament of New Zealand.

Name

The name Waimakariri comes from the Māori words {{lang|mi|wai}}, meaning water, and {{lang|mi|makariri}}, meaning cold.{{cite book |last=Reed |first=A. W. |author-link=Alexander Wyclif Reed |date=2002 |editor-last=Dowling |editor-first=Peter |title=The Reed Dictionary of New Zealand Place Names |edition=2002 |location=Auckland |publisher=Reed |page=551 |isbn=0790007614}} The river was briefly renamed as the Courtenay River in 1849 by the chief surveyor of the Canterbury Association, Joseph Thomas, in honour of Lord Courtenay. However, this name quickly fell into disuse in favour of the traditional Māori name.{{cite book

| pages = 25–27

| last=Blain

| first=Rev. Michael

| title=The Canterbury Association (1848–1852): A Study of Its Members' Connections

| year=2007

| publisher=Project Canterbury |location=Christchurch

| url= http://anglicanhistory.org/nz/blain_canterbury2007.pdf

| access-date= 21 March 2013

}}{{cite book

| page = 121

| title = A History of Canterbury: Volume I : to 1854

| volume =

| last = Hight

| first = James

|author2=C. R. Straubel

| year = 1957

| publisher = Whitcombe and Tombs Ltd

| location = Christchurch

}} The Waimakariri is colloquially referred to as the 'Waimak', a shortening of the Māori name.{{cite book | last = Logan | first = Robert | title = Waimakariri. The story of Canterbury's "river of cold rushing water" | publisher = Robert Logan | location = Christchurch | year = 1987 | isbn = 0-473-00520-4}}

Geography

The source of the Waimakariri is located in the Southern Alps, at the head of a valley to the west of Arthur's Pass, where it is primarily fed by snow melt and glacial runoff. The river flows in a southerly direction, before turning east around the base of Mount Stewart. The river at this stage becomes braided, and is joined by the Bealey River as it flows across wide shingle beds.

As the river is joined by the Esk River, the Waimakariri river is forced into a narrow series of gorges and ceases being braided. This continues as the river flows through the foothills of the Southern Alps, and its valley is used by the Midland Line railway as part of its traverse of the Southern Alps. The river exits the foothills at the Waimakariri Gorge, at which point it again expands to a braided system.

Once on the Canterbury Plains, the Waimakariri flows in a roughly east-south-easterly direction towards the Pacific Ocean. As with other braided river systems, the main channels frequently change within the primary riverbed, especially during periods of high flow rates. Geological evidence indicates that this mobility has extended to the river itself in the past, at times flowing through the current location of Christchurch into what is now the Avon Heathcote Estuary, and in a different era flowing into Lake Ellesmere / Te Waihora, to the south of Banks Peninsula.[http://www.ecan.govt.nz/Our+Environment/Land/Parks+and+Reserves/Waimakariri+River.htm Waimakariri River, An important asset to the region], Environment Canterbury website, retrieved 18 April 2008. To protect Christchurch and other settlements near the river, multiple flood protections have been constructed either side of the river since European settlement, dating as early as the Canterbury Rivers Act 1868.{{cite web |title=Canterbury Rivers Act 1868 (32 Victoriae 1868 No 21) |url=http://www.nzlii.org/nz/legis/hist_act/cra186832v1868n21343/ |website=nzlii.org |access-date=30 May 2020}}

The river currently reaches the Pacific Ocean just to the north of Christchurch, entering Pegasus Bay by way of Brooklands Lagoon. The Waimakariri marks one of only a few breaks in the roughly {{convert|50|km|abbr=on}} length of Pegasus Bay. Along with two other rivers which enter Pegasus Bay (Ashley River / Rakahuri and Waipara River), the Waimakariri is almost entirely responsible for the sediment which forms the bay and its coastal plain.{{cite journal |last1=Blake |first1=G.J. |title=The rivers and the foreshore sediment of Pegasus Bay, South Island, New Zealand |journal=New Zealand Journal of Geology and Geophysics |date=16 January 2012 |volume=11 |issue=1 |pages=225–235 |doi=10.1080/00288306.1968.10423687}}

Bridges

Due to the size of the river, only a limited number of bridges cross the Waimakariri. From upstream to downstream, the current bridges are:

;Waimakariri Falls

{{coord|-42.91821|171.48729|type:landmark_region:NZ|display=inline|name=Waimakariri Falls}}

This simple suspension bridge is just downstream from the Waimakariri Falls located on a tramping track close to the Waimakariri Falls Hut.{{cite web |title=Waimakariri Falls Hut |url=https://www.doc.govt.nz/parks-and-recreation/places-to-go/canterbury/places/arthurs-pass-national-park/things-to-do/huts/waimakariri-falls-hut/ |publisher=Department of Conservation |access-date=25 August 2022}}

;Bealey Bridge

{{coord|-43.01981|171.5964|type:landmark_region:NZ|display=inline|name=Bealey Bridge}}

The Bealey Bridge is located immediately upstream from where the Bealey River flows into the Waimakariri. It is part of State Highway 73. Bealey Bridge is single-lane, with a passing bay in the middle. It is in a remote location and does not cater for pedestrians.{{cite web |title=SH73 Waimakariri River/Bealey Bridge essential repairs over three nights |url=https://www.nzta.govt.nz/media-releases/sh73-waimakiriri-riverbealey-bridge-essential-repairs-over-three-nights/ |publisher=NZ Transport Agency |access-date=7 December 2020}}

;Midland Line bridge #42

{{coord|-43.01153|171.7148|type:landmark_region:NZ|display=inline|name=Midland Line bridge #42}}

Some {{convert|10|km}} downstream from the Bealey Bridge, the Midland Line crosses the river. KiwiRail records this bridge as number 42 on its bridge asset list.{{cite web |title=KiwiRail Bridges |url=https://catalogue.data.govt.nz/dataset/kiwirail-bridges3 |publisher=KiwiRail |access-date=7 December 2020}} It is located where Red Beech Stream flows into the Waimakariri.{{LINZ|id=5011 |name=Red Beech Stream |access-date=7 December 2020}}

;Mount White Bridge

{{coord|-43.00573|171.74686|type:landmark_region:NZ|display=inline|name=Mount White Bridge}}

The Mount White Bridge is, as the crow flies, located {{convert|2.7|km}} downstream from the KiwiRail bridge. It is much older than the Bealey Bridge. The abutment on the left bank of the Waimakariri is located within the delta created by the Hawdon River.{{LINZ|id=22442 |name=Hawdon River |access-date=7 December 2020}}

;Waimakariri Gorge Bridge

{{coord|-43.35987|172.05027|type:landmark_region:NZ|display=inline|name=Waimakariri Gorge Bridge}}

The Waimakariri Gorge Bridge is, as the crow flies, located {{convert|46|km}} downstream from the Mount White bridge. This bridge was completed in 1877 and originally served both road and rail traffic (of the Oxford Branch). The bridge is on the register of Heritage New Zealand as a Category II structure.{{NZHPT|1797 |Waimakariri Gorge Bridge |7 December 2020}}

;SH1 Waimakariri Bridges

{{coord|-43.41519|172.64672|type:landmark_region:NZ|display=inline|name=SH1 Waimakariri Bridges}}

The SH1 Waimakariri Bridges are twin bridges connecting Christchurch with the region north of the Waimakariri River via State Highway 1. It is located {{convert|48|km}} downstream from the Waimakariri Gorge Bridge. As part of the Christchurch Northern Motorway, each bridge was widened from two to three lanes during 2020, plus a cycleway added.{{cite web |title=Christchurch Northern Corridor |url= https://www.nzta.govt.nz/projects/christchurch-motorways/christchurch-northern-corridor/ |publisher=NZ Transport Agency |access-date=7 December 2020}}

;Main North Road bridge

{{coord|-43.41310|172.65137|type:landmark_region:NZ|display=inline|name=Main North Road bridge}}

Just {{convert|400|m}} downstream from the state highway bridges is the Main North Road bridge, often referred to as the Old Waimakariri Bridge.{{cite press release |author= |title=Bridge Closed Following Crash – Canterbury |url= https://www.scoop.co.nz/stories/AK2006/S00158/bridge-closed-following-crash-canterbury.htm |publisher=New Zealand Police |agency=Scoop |date= 7 June 2020 |access-date=7 December 2020}} This two-lane traffic bridge does not cater for walking or cycling.{{cite web |title=Waimakariri District Walking/Cycling Strategy |url= http://cyclingchristchurch.co.nz/2016/11/04/waimakariri-district-walkingcycling-strategy/ |publisher=Cycling in Christchurch |access-date=7 December 2020 |date=4 November 2016}}

;Main North Line bridge #17

{{coord|-43.41293|172.65151|type:landmark_region:NZ|display=inline|name=Main North Line bridge #17}}

Immediately downstream from the Main North Road bridge, the Main North Line crosses the river. Kiwirail records this bridge as number 17 on its bridge asset list.

{{Gallery

| title = Current bridges over the Waimakariri River

| align = center

| height =

| width =

| captionstyle =

| File:A bridge over Waimakariri River by Waimakariri Falls hut, Arthur's Pass National Park, New Zealand 17.jpg

| alt1=Photo of a swing bridge with steel netting over a gorge river

| Waimakariri Falls Bridge

| File:Bealey Bridge.jpg

| alt2=photo of a bridge over a river, with snow capped mountains in the background

| Bealey Bridge

| File:Two DXC class locomotives crossing the Waimakariri River bridge.JPG

| alt3=photo of two locomotives pulling a train over a bridge

|Midland Line bridge

| File:Waimakariri River bridge.jpg

| alt4=photo of a bridge over a river

| Mount White Bridge

| File:Waimakariri Gorge Bridge 002.JPG

| alt5=photo of a bridge high above over a river

| Waimakariri Gorge Bridge

| File:Between the bridges 20170422 8637 EOS M-22.jpg

| alt6=view across a river between two bridges

| SH1 bridges (looking north)

| File:Bridge over Waimakariri River, New Zealand 08.jpg

| alt7=photo of a bridge over a river

| Main North Road bridge

| File:Bridge over Waimakariri River, New Zealand 02.jpg

| alt8=photo of a bridge over a river

|Main North Line bridge (adjacent road bridge in the background)

}}

Ecology

As one of the largest rivers on the Canterbury plains, the Waimakariri is an important habitat for wildlife, including many endangered species of plants and animals. The dry sections of riverbed are home to black-fronted terns, where braids in the river provide a natural barrier to predators.{{cite web |title=Waimakariri zone biodiversity |url=https://www.ecan.govt.nz/your-region/your-environment/our-natural-environment/nature-in-your-area/waimakariri-zone-biodiversity/ |website=Environment Canterbury |access-date=30 May 2020 |language=en-NZ}} The river and its tributaries are home to native species, including crayfish / kōura, New Zealand longfin eel, short-finned eel, lamprey and many species of invertebrates. The river is one of the few remaining habitats for the critically endangered Canterbury mudfish (kowaro), which previously inhabited wetlands across the Canterbury plains, while a portion of its riverbank is home to one of only two known remaining populations of Olearia adenocarpa.

Introduced fish are common along the entirety of the Waimakariri River, making the river a popular location for fishing. As with most of New Zealand, this primarily includes brown and rainbow trout, as well as Chinook salmon (Oncorhynchus tshawytscha).{{cite web |title=Where to Fish: Waimakariri River |url=https://nzfishing.com/north-canterbury/where-to-fish/waimakariri-river/ |website=nzfishing.com |access-date=30 May 2020}} The salmon population dates to the early 1900s, when they were introduced from California, and results in large salmon runs near the river mouth in summer.McDowall, R. M. (1990) New Zealand freshwater fishes: a natural history and guide. Heinemann-Reed, Auckland, 553 p.

Development

File:View of the Waimakariri River at Kowai Bush, near Springfield, 1927 ATLIB 299398.png

In 1923 the river was mainly investigated for a hydroelectric dam to supply electricity to Christchurch. It received support from the community but the dam was never built since the Government offered inexpensive electricity from the Lake Coleridge scheme.{{cite news | last = Crean| first = Mike| title = Waimak's elusive dam| publisher = The Press| date = 2008-04-26}}

The Central Plains Water Trust is proposing to take {{convert|40|m3/s|cuft/s}} of water from two points on the Waimakariri River as part of the Central Plains Water enhancement scheme.[http://www.ecan.govt.nz/Resource+Consents/Central+Plains+Water+Trust.htm Central Plains Water Trust applications for resource consent] {{webarchive|url=https://web.archive.org/web/20070315071824/http://www.ecan.govt.nz/Resource+Consents/Central+Plains+Water+Trust.htm |date=15 March 2007 }} Environment Canterbury Resource Consents webpage, retrieved 6 October 2007.

File:Water pollution sign on the Waimakariri River.JPG

Pollution

In 2007 the Waimakariri was ranked as one of the ten most polluted of the larger rivers in New Zealand.{{cite web|url=http://www.mfe.govt.nz/environmental-reporting/freshwater/river/league-table/river-water-quality-league-tables.html |title=New Zealand's National River Water Quality Network – River water quality league tables|date=20 October 2009|publisher=Ministry for the Environment |access-date=27 December 2012}} Some of the pollution was caused by liquid wastes from industries such as a meat processing plant and wool scourers in the vicinity of the river. The wastes were discharged directly into it but as of 2012 it was piped to the municipal sewage treatment plant. There had been some non-compliance issues with the resource consents for water discharge.{{cite web|url=http://www.scoop.co.nz/stories/AK1212/S00573/fish-game-celebrates-waimakariri-water-quality.htm|title=Fish & Game Celebrates Waimakariri Water Quality|date=21 December 2012|work=Fish & Game press release|publisher=Scoop|access-date=27 December 2012}}

Cultural references

The Waimakiriri River is described in several works by author Ruth France. Her poem "After Flood", published under the pseudonym "Paul Henderson", describes "the alive / Roar of the river loud on the loose", and as being an "age-long wanderer, age-wily".{{Cite book |last=Henderson |first=Paul |title=After Flood |publisher=Caxton Press |year=1955 |pages=15}} Her novel, Ice Cold River (1961), describes the flooding of a family farm at Christmas after the Waimakariri River bursts through a stopbank:

The water advanced so slowly and quietly that it seemed no more than the tide making in an estuary backwater.... [Q]uite suddenly, the lake of water seemed to lift itself, hurled itself over the garden and against the house in a wave that thumped as did a blasting operation at a distance. Immediately the house was surrounded, and the wave went on, eating up the fields with rapid teeth of dirty foam, in which sticks and grass and debris turned over, were engulfed, and reappeared in an endless sucking whirlpool.{{Cite book |last=France |first=Ruth |title=Ice Cold River |publisher=Constable |year=1961 |location=London |pages=148–150}}

References

External links

[http://ecan.govt.nz/publications/Pages/waimakariri-river-regional-plan.aspx Waimakariri River Regional Plan] at Environment Canterbury
[https://archive.org/details/Dalmer1971 The Waimakariri River as a water resource. Dalmer, 1971 ]

Category:Hurunui District

Category:Rivers of the Canterbury Region

Category:Rivers of New Zealand

Category:Braided rivers in New Zealand

Category:Waimakariri District

Category:Arthur's Pass National Park