yes . Again, and I am sorry to be graphic, but here it is, don't forget , these dams have little creatures in them, Yabbbies, what not, chains mean nothing to them... bits come apart.
also. he has to drag ( a ) a body, wrapped in (b) a heavy chain from a bush track to someone's operative dam, that is, a dam that is being used for cattle or sheep, people look at their dams every day in the summer, sometimes twice a day, it's a fetish, 'go and look at the dam' is the normal greeting, the trail from the chain would surely be noticed....
don't take my word for it, though.
Body Decomposition in Water: A Complete Timeline & Guide