The Study Area for West Coonamble is located on the western side of the Castlereagh River (catchment area 8,400 km2 at the confluence of the Castlereagh River and Warrena Creek). The Study Area is bounded by Old Dubbo Road to the east, Effie Durham Street and Gadsens Street to the south and Conimba Street to the north. Quambone Road forms the south-western boundary of the Study Area and Coonamble Levee forms the north-eastern boundary of the Study Area. Developed areas of Coonamble Township which are located on the western floodplain of the Castlereagh River are included within the Study Area. There are approximately 680 dwellings and 1,700 population in West Coonamble. West Coonamble has a history of riverine flooding along the west bank of the Castlereagh River and on either side of Eurimie Creek.