How do the currents go in and out of the harbour?
Detailed current measurements using GPS drogues show a number of different flows in the Kaipara depending upon the tidal cycle (spring to neap). The flow is asymetric meaning that the ebb and flood are not identical in direction. The tidal current varies between 1.6 and 2.5 metres per second (up to nine kilometres per hour or five knots). The areas of strongest current are on the western side of the harbour mouth.
