Spotted in Macgregor some distance from Ginninderra Creek where they are sometimes seen. Called ACT Wildlife who agreed it was unusual to find them that far from the creek but no need to 'rescue' it or return it to the creek. Sure enough it eventually slipped into a storm water drain and presumably travelled underground to an outlet by the creek.
Drains are great habitat (assuming not too polluted). My brothers used to fish on banks of Barwon R., Geelong, Vic for carp and would hear happy munching noises behind them as the catch was utilised. They took me there and after dark the Rakali would appear out of stormwater pipes and swim by. In Melbourne on inner urban Merri Ck they were regularly seen swimming.