Hi again Fergie
I think we may simply be talking at cross purposes here. I know the map you're referring to, and that's the one labelled as "Hot Zone" along Rees Way and Creekside Park. Then a bigger circle outisde that one, extending more towards Moggill Rd direction.
But I don't think the main search was conducted based on that Hot Zone - I think that was based around the BC house as the centre. That's only going on what a couple of detectives told me during the height of the search, when we had to search our property and our dam.
But - same difference really. All of that did not result in Allison being found - that finding was pure chance. And as I mentioned before, if she HAD been washed out into the main stream of the Brisbane River, then any connection with Kholo Creek, the scout camp, Ugly Creek, etc etc would never have been known. The river is still very tidal and has significant flow, especially after that rainfall, and on an outgoing tide, a body could easily float several Km downstream.
Just as an example, back in the days when I was younger, fitter, and a keen water skier, we pulled a body out of the water. She had been seen jumping off the Jindalee bridge earlier that morning, and it was only 2-3 hours later that we found her down near the Tennyson Power House, downstream from the Indooroopilly Bridge. That is several Km, as the river is very winding.
If Allison had been washed out of Kholo Creek - and she was only metres from the mouth of the creek - we would never have made the connection with the area at all unless some other evidence turned up or a confession was made!