The hydraulic study area is the Braidwood Township and areas up to one kilometre upstream and downstream along the creeks. It is defined generally by the 2(v) Zone of the Tallaganda Local Environmental Plan. The town and study area is located within in the upper reaches of the Shoalhaven River catchment. The catchments of Gillamatong Creek, Monkittee Creek, Flood Creek and Recreation Ground Creek at Braidwood have a total area of 77 square kilometres.

The primary objective of the Braidwood Creeks Flood Study is to determine the flood behaviour along Gillamatong, Monkittee, Flood and Recreation Ground Creeks within the township of Braidwood and for a distance of 1 kilometre from the Braidwood town boundary. The floodplain that this study covers extends to the estimated limit of the Probable Maximum Precipitation flood.