I watched a bloke at Oallen not that long ago and his banker was over 100 metres from the waters edge now given the extremely porous sand and gravel there the water from his banker was not even flowing 6 feet before it all disappeared in the sand. Not one drop of the water he was pumping made it back to the river so there was no turbidity, the water was slowly filtered back into the river and no one would have known any different.