Added a few more lanes but, more importantly, I voluntarily gave myself squinty eyes and traced Dumaresq Creek from a blurry Landsat low-resolution image. Armidale now has its creek bisecting the town, flowing north-west to south-east. (Osmarender only at this stage).

I not sure how to tag the waterway, though. It's bigger than a waterway=stream, and not as grand as a waterway=river. In Australian parlance, it's a creek. It doesn't have permanent flow.

Anyway, for the time being, "stream" will be fine.