Division 8.5.4.5 Water Level (WaterLevelValue)
United Kingdom
The tidal datum / waterlevel to which depths and heights are referenced.
F1The allowed values for this code list comprise only the values in the table below.
F2Values 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. |
Annotations
Textual amendments
- F1
- F2
Notes on Annex II
Textual amendments
- F1
Words in Annex 2 heading substituted (31.12.2020) by The INSPIRE (Amendment) (EU Exit) Regulations 2018 (S.I. 2018/1338), regs. 1, 13(11)(a); 2020 c. 1, Sch. 5 para. 1(1)