AT THE POINT
Observations carried out at exact degree confluence. Site is on a wild Dog Fence, on the western Qld-NSW border.
Point information & photos: Col Grant. Author's email: email@example.com
IN THE DEGREE SQUARE
Climate: The closest representative weather station is at the Tibooburra Post Office, which is 110 km south-west of the confluence, and has an elevation of 183 m.
The highest temperature recorded was 47.6°C in January 1973, and the lowest was -2.5°C in June 1982. The greatest rainfall recorded in a year was 755.4 mm in 1974, and the lowest was 47.9 mm in 1919. These and other climate statistics for Tibooburra can be found at: Australian Bureau of Meteorology, http://www.bom.gov.au/climate/averages/tables/cw_046037_All.shtml
Extremes of Nature: Since 1906 there have been no cyclones to pass within 50 km of the degree confluence, but two have passed within 200 km (Agnes, 1956; and David, 1976). 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 Tibooburra having an average of 74 days annually with maximum temperatures equal to or over 35°C. With a low annual rainfall and only 32 days on average a year, the area is also among the driest in Australia.
The population of the degree square is probably less than 20.
Bulloo River Overflow
Looking west along the Wild Dog Fence and maintenance track towards a part of the Bulloo Overflow, a wide floodplain on which the Bulloo River (from the north) usually "disappears" through infiltration into the ground and evaporation.
One of the functions of the fence is to serve as a border between NSW and Qld. However the 29° parallel of latitude, on which the border is based, lies a short distance south of the fence.
The main function of the Wild Dog Fence is to keep dingoes out of the sheep grazing areas. For the safety of fence, only maintenance staff with permits are allowed to travel along the fence. Members of the public are forbidden to travel the fence track. A maintenance depot operated by two families is located on the southern side of the gate. The fence needs constant maintenance to keep dingoes out of NSW.
Compiled by: Col Grant 2008
Edited by: Hayley Freemantle
More to come