The bar does not necessarily have to be dredged all the time ,...

The bar does not necessarily have to be dredged all the time , the berths and areas in the harbour where deposition takes place also have to be maintained, At times there is no bar , ie after a fresh
It would be in the ports interest that the vessel uplifted maximum cargo for which they would have received wharfage which in turn would have kept the dredge operating.. The port has managed to keep the dredge Kawatiri in service by outport dredging without earning wharfage in the past few years.
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At the end of the day Bathurst have a powerful tool sitting there as a backstop when it comes to negotiating rail freight rates.