Culms triquetrous (my first image shows six that I'd cut and bunched), a little over 5mm diameter, largest were more than 1 m long. Plants in a narrow band about 80m long in a side channel of Ginninderra Creek. No evidence for any flowering this summer, but the creek has run very high a few times, most recently in the first week of April, and flooding the side channel with swift flows. Sedge mass is under Casuarinas (and one huge Salix babylonica) and growing near Carex appressa tussocks and Phragmites beds.