Abstract

The Public Works Department (PWD), in the state of New South Wales, Australia, is responsible for the operation of the state’s coastal tide monitoring system and the information obtained therefrom is used in the determination of Mean Sea Level. Due to intensified development along the coast, information such as flood heights and Mean High Water (which are used to define flood prone lands, cadastral boundaries and in extensive numerical modelling of rivers) must be accurately related to a geodetic levelling datum such as the Australian Height Datum (AHD). Anomalies were found in determinations of Mean High Water and Mean Sea Level (MSL) from ocean gauges and that derived from spirit levelling between tide gauges along the entire New South Wales coast (see Figure 1).

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