[teambob]

Strayan here. These nets are used quite widely by a number of local councils including Greater Sydney. They are not universally used though. Larger waterways may have a boom, a number have these nets, some have something like a metal sieve and many have nothing

Some people have suggested a vacuum may be easier. But a council in Australia always has bulldozers and rubbish trucks available, so it may fit better into that existing infrastructure