This is what the SCA is doing in Kangaloon.
They have failed to take any notice of their own Engineering Report.
Instead of fitting a proper "aeration tank" which would collect and remove the slurry of oxidised iron particles in the water - they have allowed the iron to contaminate the bush, adjacent to the Nepean River.
In this little levee bank, which forms an informal "pool" the existing Lomandra rush plants are all coated in iron particulate matter, as is the ground underneath.
I have personally reported this matter to the Chief Executive of the SCA, Mr Graeme Head. I await his response, with interest.