{
  "url": "https://openlegislation.uk/eu-regulation-2010-1089/annex-II/division-8/division-8.5/division-8.5.4/division-8.5.4.5",
  "json_url": "https://openlegislation.uk/eu-regulation-2010-1089/annex-II/division-8/division-8.5/division-8.5.4/division-8.5.4.5.json",
  "legislation": "eur/2010/1089",
  "legislation_title": "Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2010-1089",
  "path": "annex/II/division/8/division/8.5/division/8.5.4/division/8.5.4.5",
  "kind": "division",
  "number": "8.5.4.5",
  "heading": "Water Level (WaterLevelValue)",
  "text": "The tidal datum / waterlevel to which depths and heights are referenced.\nThe allowed values for this code list comprise only the values in the table below.\nValues for the code list WaterLevelValue\nValue\nDefinition\nequinoctialSpringLowWater\nThe level of low water springs near the time of an equinox.\nhigherHighWater\nThe 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.\nhigherHighWaterLargeTide\nThe average of the highest high waters, one from each of 19 years of observations.\nhighestAstronomicalTide\nThe highest tidal level, which can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions.\nhighestHighWater\nThe highest water level observed at a location.\nhighWater\nThe highest level reached at a location by the water surface in one tidal cycle.\nhighWaterSprings\nAn arbitrary level, approximating that of mean high water springs.\nindianSpringHighWater\nA tidal surface datum approximating the level of the mean of the higher high water at spring tides.\nindianSpringLowWater\nA tidal surface datum approximating the level of the mean of the lower low water at spring tides.\nlocalDatum\nAn arbitrary datum defined by an authority of a local harbour, from which levels and tidal heights are measured by that authority.\nlowerLowWater\nThe 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.\nlowerLowWaterLargeTide\nThe average of the lowest low waters, one from each of 19 years of observations.\nlowestAstronomicalTide\nThe lowest tide level that can be predicted to occur under average meteorological conditions and under any combination of astronomical conditions.\nlowestLowWater\nAn arbitrary level conforming to the lowest tide observed at a location, or somewhat lower.\nlowestLowWaterSprings\nAn arbitrary level conforming to the lowest water level observed at a location at spring tides during a period shorter than 19 years.\nlowWater\nAn approximation of mean low water adopted as the reference level for a limited region, irrespective of better determinations later.\nlowWaterDatum\nAn approximation of mean low water that has been adopted as a standard reference for a limited area.\nlowWaterSprings\nA level approximating that of mean low water springs.\nmeanHigherHighWater\nThe average height of higher high waters at a location over a 19-year period.\nmeanHigherHighWaterSprings\nThe average height of higher high water at spring tides at a location.\nmeanHigherLowWater\nThe average of the higher low water height of each tidal day observed over a National Tidal Datum Epoch.\nmeanHighWater\nThe average height of all high waters at a location over a 19-year period.\nmeanHighWaterNeaps\nThe average height of the high waters of the neap tide.\nmeanHighWaterSprings\nThe average height of the high waters of spring tides.\nmeanLowerHighWater\nThe average of the lower high water height of each tidal day observed over a National Tidal Datum Epoch.\nmeanLowerLowWater\nThe average height of the lower low waters at a location over a 19-year period.\nmeanLowerLowWaterSprings\nThe average height of lower low water at spring tides at a location.\nmeanLowWater\nThe average height of all low waters at a location over a 19-year period.\nmeanLowWaterNeaps\nThe average height of the low waters of the neap tide.\nmeanLowWaterSprings\nThe average height of the low waters of spring tides.\nmeanSeaLevel\nThe average height of the sea at a tide station measured from a fixed predetermined reference level.\nmeanTideLevel\nThe arithmetic mean of mean high water and mean low water.\nmeanWaterLevel\nThe average of all hourly water levels over the available period of record.\nnearlyHighestHighWater\nAn arbitrary level approximating the highest water level observed at a location, usually equivalent to the high water springs.\nnearlyLowestLowWater\nA level approximating the lowest water level observed at a location, usually equivalent to Indian spring low water.\ntropicHigherHighWater\nThe 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.\ntropicLowerLowWater\nThe 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.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Substituted by Commission Regulation (EU) No 1253/2013 of 21 October 2013 amending Regulation (EU) No 1089/2010 implementing Directive 2007/2/EC as regards interoperability of spatial data sets and services."
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Inserted by Commission Regulation (EU) No 102/2011 of 4 February 2011 amending Regulation (EU) No 1089/2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2010/1089/annex/II/division/8/division/8.5/division/8.5.4/division/8.5.4.5",
    "retrieved_at": "2026-11-01T14:50:29.783808+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}