Lowbidgee Floodplain
Encyclopedia
Balranald, New South Wales
Balranald is a town and local government area in the Riverina district of New South Wales, Australia. At the 2006 census the population was 1,216....
to near Waradgery Station, about 20 km west of Hay
Hay, New South Wales
Hay is a town in the western Riverina region of south western New South Wales , Australia. It is the administrative centre of Hay Shire Local Government Area and the centre of a prosperous and productive agricultural district on the wide Hay Plains....
, in south-western New South Wales. It comprises an extensive (c.2000 km2) floodplain
Floodplain
A floodplain, or flood plain, is a flat or nearly flat land adjacent a stream or river that stretches from the banks of its channel to the base of the enclosing valley walls and experiences flooding during periods of high discharge...
of the lower Murrumbidgee River
Murrumbidgee River
The Murrumbidgee River is a major river in the state of New South Wales, Australia, and the Australian Capital Territory . A major tributary of the Murray River, the Murrumbidgee flows in a west-northwesterly direction from the foot of Peppercorn Hill in the Fiery Range of the Snowy Mountains,...
and its tributaries, including the confluence of the Murrumbidgee with the Lachlan River
Lachlan River
- Course :The river rises in the central highland of New South Wales, part of the Great Dividing Range, 13 km east of Gunning. Its major headwaters, the Carcoar River, the Belubula River and the Abercrombie River converge near the town of Cowra. Minor tributaries include the Morongla Creek...
, with numerous swamps and lakes. The extent of the floodplain has been reduced in size from over 3000 km2 at the beginning of the 20th century by the construction of dam
Dam
A dam is a barrier that impounds water or underground streams. Dams generally serve the primary purpose of retaining water, while other structures such as floodgates or levees are used to manage or prevent water flow into specific land regions. Hydropower and pumped-storage hydroelectricity are...
s, irrigation systems
Irrigation
Irrigation may be defined as the science of artificial application of water to the land or soil. It is used to assist in the growing of agricultural crops, maintenance of landscapes, and revegetation of disturbed soils in dry areas and during periods of inadequate rainfall...
and other hydraulic engineering
Hydraulic engineering
This article is about civil engineering. For the mechanical engineering discipline see Hydraulic machineryHydraulic engineering as a sub-discipline of civil engineering is concerned with the flow and conveyance of fluids, principally water and sewage. One feature of these systems is the extensive...
works, with the water inflow declining by at least 60% between 1888 and 1998. Apart from Yanga National Park
Yanga National Park
Yanga is a 31,190-hectare national park located on frontage of on the Murrumbidgee River and east of Balranald, in the Riverina region of southwest New South Wales...
(established in 2005 on the former Yanga Station) most of the floodplain consists of commercial irrigated farmland
Farmland
Farmland generally refers to agricultural land, or land currently used for the purposes of farming. It may also refer to:*Arable land, land capable of cultivating crops*Farmland, Indiana, a town in the United States...
.
Birds
A 1908 km2 area of the floodplain, defined as the maximum area of contemporary flooding, has been identified by BirdLife InternationalBirdLife International
BirdLife International is a global Partnership of conservation organisations that strives to conserve birds, their habitats and global biodiversity, working with people towards sustainability in the use of natural resources...
as an Important Bird Area
Important Bird Area
An Important Bird Area is an area recognized as being globally important habitat for the conservation of bird populations. Currently there are about 10,000 IBAs worldwide. The program was developed and sites are identified by BirdLife International...
(IBA) because it has supported up to 650,000 waterbirds during times of major flooding, and regularly supports over 1% of the world populations of Black Swan
Black Swan
The Black Swan is a large waterbird, a species of swan, which breeds mainly in the southeast and southwest regions of Australia. The species was hunted to extinction in New Zealand, but later reintroduced. Within Australia they are nomadic, with erratic migration patterns dependent upon climatic...
s, Freckled Duck
Freckled Duck
The Freckled Duck is a moderately large, broad-bodied duck native to southern Australia. The duck is protected by law...
s, Pink-eared Duck
Pink-eared Duck
The Pink-eared Duck is a species of duck found in Australia.It has a large spatulate bill like the Australasian Shoveler, but is smaller at 38–40 cm length. Its brown back and crown, black and white barred sides and black eye patches on its otherwise white face make this bird unmistakable...
s, Grey Teal
Grey Teal
The Grey Teal, Anas gracilis is a dabbling duck found in open wetlands in New Guinea, Australia, New Zealand, Vanuatu and Solomon Islands....
s, Australasian Shoveler
Australasian Shoveler
The Australasian Shoveler is a species of dabbling duck in the genus Anas. It ranges from 46–53 cm. It lives in heavily vegetated swamps. In Australia it is protected under the National Parks and Wildlife Act, 1974...
s, Straw-necked Ibis
Straw-necked Ibis
The Straw-necked Ibis is a bird of the ibis and spoonbill family Threskiornithidae. It can be found throughout Australia, New Guinea, and parts of Indonesia. Adults have distinctive straw-like feathers on their neck....
es, Yellow-billed Spoonbill
Yellow-billed Spoonbill
The Yellow-billed Spoonbill is common in southeast Australia; it is not unusual on the remainder of the continent, and is a vagrant to New Zealand, Lord Howe Island and Norfolk Island. It is around 90 cm long, and has white plumage with a yellow bill, legs and feet. It nests in trees, marshes or...
s and White-headed Stilt
White-headed Stilt
The White-headed Stilt or Pied Stilt is a bird in the Recurvirostridae family. It is sometimes treated as a distinct species Himantopus leucocephalus, sometimes included in the Common or Black-winged Stilt as Himantopus himantopus leucocephalus.This shorebird is found in Australia, Brunei,...
s. Other birds that have been recorded in large numbers include Whiskered Tern
Whiskered Tern
The Whiskered Tern is a seabird of the tern family Sternidae. This bird has a number of geographical races, differing mainly in size and minor plumage details....
s and Eurasian Coot
Eurasian Coot
The Eurasian Coot, Fulica atra, also known as Coot, is a member of the rail and crake bird family, the Rallidae. The Australian subspecies is known as the Australian Coot.-Distribution:...
s. Reduced inundation of the floodplain, through the construction of water management works, has resulted in waterbird numbers dropping by 90%, from an average of 140,000 in 1983-86 to 14,000 in 1998-2001.