29°S 145°E Lake Wombah – Queensland by Degrees

AT THE POINT

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ne

Looking north                                                                      Looking east

sw

Looking south                                                                     Looking west

Observations carried out at a site 20.4 km due south of degree confluence (rain made property tracks impassable)

The degree confluence is on the western Qld-NSW border, in an area that drains into Cuttaburra Basin, between the Paroo and Warrego Rivers.

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GPS

gron

Ground

Plains Area

The area is SW of the degree confluence 29°S 145°W. There is no clearly defined drainage pattern, with clay pans, areas subject to inundation and local internal drainages predominating. Officially the area lies between the Warrego and Paroo catchments.

The clay content of the soil allows water to remain on the surface rather than soaking rapidly into the ground.

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Plains Area

Point information & photos: Col Grant 2008. Author's email:cgrant@vnc.qld.edu.au

IN THE DEGREE SQUARE

Access Tracks

After the rain the local roads become slippery and prone to damage by vehicles. All the dirt roads in the Bourke Shire (NSW) closed after the rain in late September 2008, and reopened only after sufficient drying out. They remained slippery and access tracks to properties were no recommended.

Thus observations were carried out some km's away from the true degree confluence.

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Access Tracks

 

Climate: The closest weather station is at the Wanaaring Post Office (048079) in NSW, which is 115 km south-west of the confluence and has an elevation of 108m.

 

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Year

Mean max
(ºC)

36.6

35.4

32.6

27.9

22.6

19.0

18.6

21.1

25.5

29.3

32.3

35.0

28.0

Mean min
(ºC)

21.7

20.9

17.4

12.8

8.7

5.4

4.1

5.3

9.2

13.1

16.6

19.6

12.9

Mean rain
(mm)

34.9

33.8

26.3

15.9

24.2

19.6

17.6

15.0

13.9

20.3

24.8

28.7

275.0

The highest temperature recorded was 47.0°C in January 2001, and the lowest was -3.9°C in July 1997. The greatest rainfall recorded in a year was 746.6 mm in 1976, and the lowest was 45.0 mm in 1982. These and other climate statistics for Wanaaring can be found at: Australian Bureau of Meteorology, http://www.bom.gov.au/climate/averages/tables/cw_048079_All.shtml

Extremes of Nature: Since 1906 there have been no cyclones to pass within 50 km of the degree confluence, but one to pass within 200 km (Agnes, 1956). Cyclone information for this area and all of Australia can be found at the Australian Bureau of Meteorology website, http://www.bom.gov.au/cgi-bin/silo/cyclones.cgi

Cyclone tracks within 200 km of the confluence, 1906 to 2006 (Bureau of Meteorology web site)

The area can experience extreme heat throughout some of the year, with Wanaaring having an average of 72 days annually with maximum temperatures equal to or over 35°C. The area is also quite dry, an experiences on average only 32 days a year with rain.

Today:

The population of the degree square is probably less than 20.

Edited by:  Hayley Freemantle