50.

In point 8.5.4.5, the following table is added: Allowed values for the code list WaterLevelValue Value Definition equinoctialSpringLowWater The level of low water springs near the time of an equinox. higherHighWater The highest of the high waters (or single high water) of any specified tidal day due to the declination A1 effects of the moon and sun. higherHighWaterLargeTide The average of the highest high waters, one from each of 19 years of observations. highestAstronomicalTide The highest tidal level, which can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions. highestHighWater The highest water level observed at a location. highWater The highest level reached at a location by the water surface in one tidal cycle. highWaterSprings An arbitrary level, approximating that of mean high water springs. indianSpringHighWater A tidal surface datum approximating the level of the mean of the higher high water at spring tides. indianSpringLowWater A tidal surface datum approximating the level of the mean of the lower low water at spring tides. localDatum An arbitrary datum defined by an authority of a local harbour, from which levels and tidal heights are measured by that authority. lowerLowWater The lowest of the low waters (or single low water) of any specified tidal day due to the declination A1 effects of the moon and sun. lowerLowWaterLargeTide The average of the lowest low waters, one from each of 19 years of observations. lowestAstronomicalTide The lowest tide level that can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions. lowestLowWater An arbitrary level conforming to the lowest tide observed at a location, or somewhat lower. lowestLowWaterSprings An arbitrary level conforming to the lowest water level observed at a location at spring tides during a period shorter than 19 years. lowWater An approximation of mean low water adopted as the reference level for a limited region, irrespective of better determinations later. lowWaterDatum An approximation of mean low water that has been adopted as a standard reference for a limited area. lowWaterSprings A level approximating that of mean low water springs. meanHigherHighWater The average height of higher high waters at a location over a 19-year period. meanHigherHighWaterSprings The average height of higher high water at spring tides at a location. meanHigherLowWater The average of the higher low water height of each tidal day observed over a National Tidal Datum Epoch. meanHighWater The average height of all high waters at a location over a 19-year period. meanHighWaterNeaps The average height of the high waters of the neap tide. meanHighWaterSprings The average height of the high waters of spring tides. meanLowerHighWater The average of the lower high water height of each tidal day observed over a National Tidal Datum Epoch. meanLowerLowWater The average height of the lower low waters at a location over a 19-year period. meanLowerLowWaterSprings The average height of lower low water at spring tides at a location. meanLowWater The average height of all low waters at a location over a 19-year period. meanLowWaterNeaps The average height of the low waters of the neap tide. meanLowWaterSprings The average height of the low waters of spring tides. meanSeaLevel The average height of the sea at a tide station measured from a fixed predetermined reference level. meanTideLevel The arithmetic mean of mean high water and mean low water. meanWaterLevel The average of all hourly water levels over the available period of record. nearlyHighestHighWater An arbitrary level approximating the highest water level observed at a location, usually equivalent to the high water springs. nearlyLowestLowWater A level approximating the lowest water level observed at a location, usually equivalent to Indian spring low water. tropicHigherHighWater The highest of the high waters (or single high water) of the tides occurring semimonthly when the effect of the Moon's maximum declination is greatest. tropicLowerLowWater The lowest of the low waters (or single low water) of the tides occurring semimonthly when the effect of the Moon's maximum declination is greatest.