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Riverina

Region in New South Wales, Australia

  • 28 min read
  • 10 chapters
Murrumbidgee River in Wagga Wagga.
Tim Keegan · CC BY-SA 2.0

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Through Irrigation, Grazing and Wool

Home to Aboriginal groups including the Wiradjuri people for over 40,000 years, the Riverina was colonised by Europeans in the mid-19th century as a pastoral region providing beef and wool to markets in Australia and beyond. In the 20th century, the development of major irrigation areas in the Murray and Murrumbidgee valleys has led to the introduction of crops such as rice and wine grapes. The Riverina has strong cultural ties to Victoria, and the region was the source of much of the impetus behind the federation of Australian colonies.

Major population and service centres in the Riverina include the cities of Wagga Wagga, Leeton, Griffith and Albury. Wagga Wagga is home to a campus of Charles Sturt University and two major Australian Defence Force establishments. Albury is also home to a campus of Charles Sturt University which is located in the suburb of Thurgoona and one major Australian Defence Force establishment. La Trobe University has a campus in Wodonga, Victoria.

Geography

Government agencies and other bodies

The delineation of the Riverina region varies by government agency or body. Common official boundaries include the Australian Bureau of Statistics' Statistical Area Level 4 Riverina region, Australian Electoral Commission's Federal Election Boundary called Riverina, Natural Resource Management Regions Riverina region, Regional Development Australia's Riverina region and Interim Biogeographic Regionalisation for Australia's Riverina region.

Common usage

In common usage the Riverina generally comprises the agricultural and pastoral areas of New South Wales, west of the Great Dividing Range and in the drainage basin of the snow-fed Murray and Murrumbidgee Rivers. The northern boundary beyond the Riverina is determined by the Lachlan River catchment area and is referred to as the Central West. Along the Murray to the south, the Riverina borders the state of Victoria. West of the confluence of the Murray and Murrumbidgee is the beginning of the more arid Far West region.

In general, the Riverina is an alluvial plain formed by deposition carried from the Great Dividing Range by streams between 30,000 and 15,000 years ago. The terrain includes rolling hills to the east but then becomes flatter to the west with most of that plain reaching less than 200 metres (660 ft) above sea level. The western Riverina consists largely of featureless saltbush plain.

Landform and hydrology

The geology of the Riverina comprises several troughs and sedimentary basins. The western Riverina is presumed to be a continuation of the Ballarat and Bendigo geological zone while eastern sections are underlain by western portions of the Lachlan Fold Belt. There is potential for the Riverina to host several mineral deposit types including coal, petroleum, coal seam methane, gypsum, orogenic gold, Cobar style polymetallic systems, heavy mineral sands and possibly diamonds in these fold belt rocks and basins. Riverina soils are generally sandy along the river channels, with more saline grey and brown clays found on rarely flooded areas on the perimeter of the floodplain. As the Murrumbidgee passes downstream, the water and soil become more saline.

The Riverina is drained by the large Murray-Darling Basin. Rivers and streams in the Riverina generally flow east to west. As well as the Murray, Murrumbidgee and Lachlan, other streams include Billabong Creek and the Edward River, an anabranch of the Murray. Much of the water carried by these streams is diverted. In 2001–2002, 52% of the Murray and Murrumbidgee water runoff was diverted, 77% of which was used for irrigation.

Climate

The Bureau of Meteorology classifies the Riverina in the Hot Dry Zone (with cooler winters) climatic zone. Places in this zone can be very hot in the summer months while in the winter, nights can be considerably cold with cool to mild days. Mean daily maximum temperatures in the Riverina range from 31.0 °C (87.8 °F) in January and 12.4 °C (54.3 °F) in July in Wagga Wagga to 33.2 °C (91.8 °F) in January and 14.8 °C (58.6 °F) in July in Hillston. Under the Köppen climate classification, the region predominantly falls in the hot-summer Mediterranean climate (Csa) zone, although areas in the west of the region would feature the semi-arid (BSk / BSh) climate and those in the east would have a humid subtropical (Cfa) climate, though still with Mediterranean climate tendencies when it comes to the rainfall pattern.

Rainfall levels in the Riverina are generally low with the median annual rainfall over most of the region between 250–500 millimetres (9.8–19.7 in), rising to between 500–800 mm (20–31 in) on the eastern fringe. Because the region is situated on the upwind side of the Great Dividing Range, winter would receive the most rainfall in the year, with areas in the southern Riverina (around Albury), having the wettest winters, while in the north rainfall patterns are fairly consistent throughout the year. Corowa, in the south eastern Riverina has an average rainfall of 539.4 millimetres (21.2 in) per year while mean annual rainfall at Hay is 367.2 millimetres (14.5 in). Drought in 2006 saw the lowest ever recorded rainfall in towns such as Lockhart, Tarcutta and Narrandera.

Despite the very low elevation compared to other regions of the state known for colder winters, snow has been recorded on multiple occasions in Albury and Wagga Wagga, and on 24 July 1936 a flurry of snow was reported in Hay, which at just 90 metres (300 ft) above sea level would make it the lowest altitude that snow has ever been observed to in New South Wales. In Narrandera it last snowed in June 1908, July 1901 and August 1899. The most recent occurrence of snow in the Riverina proper was at Junee in August 2019 – excluding the mountainous parts of the South West Slopes.

Riverina bioregion

One method of classification of boundaries for the Riverina is the Interim Biogeographic Regionalisation for Australia that defines the bioregion as an area comprising 9,704,469 hectares (23,980,270 acres), with biogeographic sub-regions covering each of the Lachlan, Murrumbidgee, Murray Fans, Victorian Riverina, Robinvale Plains and Murray Scroll Belt.

The NSW National Parks & Wildlife Service has divided New South Wales into 17 distinct bioregions. Bioregions are quite large areas of land that capture a geophysical pattern which is linked to fauna and flora ecosystems. The Riverina bioregion is an area of land that comprises part of the larger Riverina area but also extends into Victoria. It has been defined by the New South Wales Parks and Wildlife Service as extending from Ivanhoe in the Murray Darling Depression Bioregion south to Bendigo, and from Narrandera in the east to Balranald in the west. 74.03% of the bioregion is in New South Wales, the remainder in Victoria.

In another mapping the World Wildlife Fund has made this area part of the larger Southeast Australia temperate savanna ecoregion that covers the western plains of New South Wales.

River channels in the region support river red gum (Eucalyptus camaldulensis) and River Cooba (Acacia stenophylla) communities. Nearby higher areas contain black box (Eucalyptus largiflorens) woodlands and a salt-tolerant grass, saltbush and daisy understorey. Yellow box (Eucalyptus melliodora) and grey box (Eucalyptus microcarpa) occur along with Cypress Pine (Callitris glaucophylla) on areas rarely subjected to flooding. The area away from the rivers often consists of treeless plains, consisting of various saltbush (Atriplex) species, Cotton Bush (Maireana aphylla) and varieties of Danthonia and Austrostipa native grasslands.

Significant mammals endemic to forests in the bioregion include various species of glider, such as sugar gliders (Petaurus breviceps), feathertail gliders (Acrobates pygmaeus) and squirrel gliders (Petaurus norfolcensis) as well as koalas (Phascolarctos cinereus) A wide variety of birdlife makes its home in wetlands in the Riverina, including many migratory species. Competition from introduced species and the effect of clearing, grazing and pasture improvement has led to a decline in the diversity of native flora and fauna in the area.

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