From appearance, could be either Carex appressa (which is much more common) or Carex tereticaulis, but the photo isn't clear enough for to confirm. However, Carex appressa is more likely, because it is more common, occurring in the type of location of this sighting.
The photo of the seed head didn't come out well. This was a large plant, bigger than I expect from Carex appressa. It was on the slope, away from the water. The seed heads were pretty well spent, so might not be much help in identification.
The (useful) difference between them: Carex tereticualis has a rounded stem (culm) and Carex appressa more triangular. It is common for these to get established at high water level mark, during a max fill phase; and then when levels recede, the tussocks look "stranded" and well away from the water.
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