tidal charts. Geomorphological influences on characteristics E3.1b Tidal Tide and current tables Use tide tables and appropriate software information Tide prediction tools to determine predicted water levels and tidal currents. (B) E3.1c Non-tidal Changes in water level caused Describe the effect of non-tidal influences water level by: atmospheric pressure, on tidal water levels in the conduct of a variations wind, seiches, ocean hydrographic survey temperature and precipitation. Water level variations in Describe sources of level variations (B) estuaries, wetlands and rivers occurring in inland waters Water level variations occurring in inland lakes, rivers, reservoirs and canals E3.2 Water Level Measurement E3.2a Water Operating principles of various Explain the principles of operation of level gauges of water level gauges different types of water level gauges. including pressure (vented and Install, and calibrate a water level unvented), GNSS buoys, float, gauge. (I) radar, acoustic sensors and tide E3.2b Configure water level gauges for logging poles/boards/staffs. measurement data, data communication, data download Installing water level gauges, and for network operation with establishment and levelling of appropriate quality control measures. (I) associated survey marks E3.2c Water Define various tidally based reference Networks of level gauges level datums levels on the basis of tide time series and Reference levels such as MSL, explain how these values are computed. chart datum, and mean high (B) water. Describe how vertical reference levels in River and lake datums rivers and lakes are defined, and Uncertainties associated with determined in practice. measurement devices E3.2d Relate uncertainty in water levels to Uncertainties associated with Uncertainty in uncertainties in measurement, duration
charts. Geomorphological influences on tidal characteristics E3.1b Tidal information (B) Tide and current tables Tide prediction tools Use tide tables and appropriate software to determine predicted water levels and tidal currents. E3.1c Non-tidal water level variations (B) Changes in water level caused by: atmospheric pressure, wind, seiches, ocean temperature and precipitation. Water level variations in estuaries, wetlands and rivers Water level variations occurring in inland lakes, rivers, reservoirs and canals Describe the effect of non-tidal influences on tidal water levels in the conduct of a hydrographic survey Describe sources of level variations occurring in inland waters E3.2 Water Level Measurement E3.2a Water level gauges (I) Operating principles of various of water level gauges including pressure (vented and unvented), GNSS buoys, float, radar, acoustic sensors and tide poles/boards/staffs. Installing water level gauges, establishment and levelling of associated survey marks Networks of level gauges Reference levels such as MSL, chart datum, and mean high water. River and lake datums Uncertainties associated with measurement devices Uncertainties associated with Explain the principles of operation of different types of water level gauges. Install, and calibrate a water level gauge. E3.2b measurement (I) Configure water level gauges for logging data, data communication, data download and for network operation with appropriate quality control measures. E3.2c Water level datums (B) Define various tidally based reference levels on the basis of tide time series and explain how these values are computed. Describe how vertical reference levels in rivers and lakes are defined, and determined in practice. E3.2d Uncertainty in Relate uncertainty in water levels to uncertainties in measurement, duration
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