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 (c. 1089)

ANNEX II U.K. REQUIREMENTS FOR SPATIAL DATA THEMES LISTED IN ANNEX I TO DIRECTIVE 2007/2/EC

8. HYDROGRAPHY U.K.

8.1. Definitions U.K.

In addition to the definitions set out in Article 2, the following definitions shall apply:

• ‘aquifer’ means a subsurface layer or layers of rock or other geological strata of sufficient porosity and permeability to allow either a significant flow of groundwater or the abstraction of significant quantities of groundwater,

• ‘groundwater’ means all water which is below the surface of the ground in the saturation zone and in direct contact with the ground or subsoil,

• ‘sub-basin’ means an area of land from which all surface run-off flows through a series of streams, rivers and, possibly, lakes to a particular point in a water course,

8.2. Structure of the Spatial Data Theme Hydrography U.K.

The types specified for the spatial data theme Hydrography are structured in the following packages:

• Hydro - base

• Hydro - Network

• Hydro - Physical Waters

• [F1 . . . . .]

Textual Amendments

F1 Deleted 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.

8.3. Hydro - base U.K.

8.3.1. Spatial Object Types U.K.

The following spatial object types shall be used for the exchange and classification of spatial objects related to Hydro - base:

• Hydro Object

8.3.1.1. Hydro Object (HydroObject) U.K.

An identity base for hydrographic (including man-made) objects in the real world.

This type is abstract.

Attributes of the spatial object type HydroObject

Attribute	Definition	Type	Voidability
geographicalName	A geographical name that is used to identify a hydrographic object in the real world. It provides a ‘key’ for implicitly associating different representations of the object.	GeographicalName	voidable
hydroId	An identifier that is used to identify a hydrographic object in the real world. It provides a ‘key’ for implicitly associating different representations of the object.	HydroIdentifier

Association roles of the spatial object type HydroObject

Association role	Definition	Type	Voidability
relatedHydroObject	A related hydrographic object representing the same real-world entity.	HydroObject	voidable

8.3.2. Data Types U.K.

8.3.2.1. Hydro Identifier (HydroIdentifier) U.K.

A hydrographic thematic identifier.

Attributes of the data type HydroIdentifier

Attribute	Definition	Type	Voidability
classificationScheme	A description of the identification scheme (National, European, etc.) being used.	CharacterString
localId	A local identifier, assigned by some authority.	CharacterString
Namespace	An indicator of the scope for the local identifier.	CharacterString

8.4. Hydro - Network U.K.

8.4.1. Spatial Object Types U.K.

The following spatial object types shall be used for the exchange and classification of spatial objects related to Hydro - Network:

• Hydro Node

• Watercourse Link

• Watercourse Link Sequence

• Watercourse Separated Crossing

8.4.1.1. Hydro Node (HydroNode) U.K.

A node within the hydrographic network.

This type is a sub-type of Node.

This type is a sub-type of HydroObject.

Attributes of the spatial object type HydroNode

Attribute	Definition	Type	Voidability
hydroNodeCategory	Nature of the hydro node.	HydroNodeCategoryValue	voidable

8.4.1.2. Watercourse Link (WatercourseLink) U.K.

A segment of a watercourse within a hydrographic network.

This type is a sub-type of Link.

This type is a sub-type of HydroObject.

Attributes of the spatial object type WatercourseLink

Attribute	Definition	Type	Voidability
flowDirection	Direction of water flow in the segment relative to digitisation of segment geometry.	LinkDirectionValue	voidable
length	Length of network segment.	Length	voidable

8.4.1.3. Watercourse Link Sequence (WatercourseLinkSequence) U.K.

A sequence of watercourse links representing a non-branching path through a hydrographic network.

This type is a sub-type of LinkSequence.

This type is a sub-type of HydroObject.

8.4.1.4. Watercourse Separated Crossing (WatercourseSeparatedCrossing) U.K.

An element in the hydrographic network used to indicate non-interacting crossing of watercourse links separated by level.

This type is a sub-type of GradeSeparatedCrossing.

This type is a sub-type of HydroObject.

8.4.2. Code Lists U.K.

8.4.2.1. Hydro Node Category (HydroNodeCategoryValue) U.K.

Defines categories for different types of hydrographic network nodes.

[F2 The allowed values for this code list comprise only the values in the table below.]

Textual Amendments

F2 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.

[F3 [F2 Values for the code list] HydroNodeCategoryValue

Value	Definition
boundary	Node used to connect different networks.
flowConstriction	A network node unrelated to the network topology per se, but associated with a hydrographic point of interest or facility, or a man-made object, that affects the network flow.
flowRegulation	A network node unrelated to the network topology per se, but associated with a hydrographic point of interest or facility, or a man-made object, that regulates the network flow.
junction	Node where three or more links connect.
outlet	Ending node of a series of interconnected links.
source	Starting node of a series of interconnected links.]

Textual Amendments

F3 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.

8.5. Hydro - Physical Waters U.K.

8.5.1. Spatial Object Types U.K.

The following spatial object types shall be used for the exchange and classification of spatial objects related to Hydro - Physical Waters:

• Crossing

• Dam or Weir

• Drainage Basin

• Embankment

• Falls

• Fluvial Point

• Ford

• Hydro Point of Interest

• [F1 . . . . .

• . . . . .]

• Land-Water Boundary

• Lock

• Man-made Object

• [F1 . . . . .

• . . . . .

• . . . . .]

• Rapids

• River Basin

• Shore

• Shoreline Construction

• Sluice

• Standing Water

• Surface Water

• Watercourse

• Wetland

8.5.1.1. Crossing (Crossing) U.K.

A man-made object allowing the passage of water above or below an obstacle.

This type is a sub-type of ManMadeObject.

Attributes of the spatial object type Crossing

Attribute	Definition	Type	Voidability
type	The type of physical crossing.	CrossingTypeValue	voidable

8.5.1.2. Dam Or Weir (DamOrWeir) U.K.

A permanent barrier across a watercourse used to impound water or to control its flow.

This type is a sub-type of ManMadeObject.

8.5.1.3. Drainage Basin (DrainageBasin) U.K.

Area having a common outlet for its surface runoff.

This type is a sub-type of HydroObject.

Attributes of the spatial object type DrainageBasin U.K.

Attribute	Definition	Type	Voidability
area	Size of the drainage basin area.	Area	voidable
basinOrder	Number (or code) expressing the degree of branching/dividing in a drainage basin system.	HydroOrderCode	voidable
beginLifespanVersion	Date and time at which this version of the spatial object was inserted or changed in the spatial data set.	DateTime	voidable
endLifespanVersion	Date and time at which this version of the spatial object was superseded or retired in the spatial data set.	DateTime	voidable
geometry	The geometry of the drainage basin, as a surface.	GM_Surface
inspireId	External object identifier of the spatial object.	Identifier
origin	Origin of the drainage basin.	OriginValue	voidable

Association roles of the spatial object type DrainageBasin U.K.

Association role	Definition	Type	Voidability
outlet	The surface water outlet(s) of a drainage basin.	SurfaceWater	voidable
containsBasin	A smaller sub-basin contained within a larger basin	DrainageBasin	voidable

Constraints of the spatial object type DrainageBasin U.K.

A river basin may not be contained in any other basin

8.5.1.4. Embankment (Embankment) U.K.

A man-made raised long mound of earth or other material.

This type is a sub-type of ManMadeObject.

[ F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .]

8.5.1.5. Falls (Falls) U.K.

A vertically descending part of a watercourse where it falls from a height.

This type is a sub-type of FluvialPoint.

Attributes of the spatial object type Falls

Attribute	Definition	Type	Voidability
height	Distance measured from the lowest point of the base at ground or water level (downhill side/downstream side) to the tallest point of the spatial object.	Length	voidable

8.5.1.6. Fluvial Point (FluvialPoint) U.K.

A hydro point of interest that affects the flow of a watercourse.

This type is a sub-type of HydroPointOfInterest.

This type is abstract.

8.5.1.7. Ford (Ford) U.K.

A shallow part of a watercourse used as a road crossing.

This type is a sub-type of ManMadeObject.

8.5.1.8. Hydro Point Of Interest (HydroPointOfInterest) U.K.

A natural place where water appears, disappears or changes its flow.

This type is a sub-type of HydroObject.

This type is abstract.

Attributes of the spatial object type HydroPointOfInterest

Attribute	Definition	Type	Voidability
beginLifespanVersion	Date and time at which this version of the spatial object was inserted or changed in the spatial data set.	DateTime	voidable
endLifespanVersion	Date and time at which this version of the spatial object was superseded or retired in the spatial data set.	DateTime	voidable
geometry	The geometry of the hydro point of interest, as a point, curve or surface.	GM_Primitive	voidable
inspireId	External object identifier of the spatial object.	Identifier
levelOfDetail	Resolution, expressed as the inverse of an indicative scale or a ground distance.	MD_Resolution

F1 8.5.1.9. Hydro Power Plant (HydroPowerPlant) U.K.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 8.5.1.10. Inundated Land (InundatedLand) U.K.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8.5.1.11. Land-Water Boundary (LandWaterBoundary) U.K.

The line where a land mass is in contact with a body of water.

Attributes of the spatial object type LandWaterBoundary

Attribute	Definition	Type	Voidability
beginLifespanVersion	Date and time at which this version of the spatial object was inserted or changed in the spatial data set.	DateTime	voidable
endLifespanVersion	Date and time at which this version of the spatial object was superseded or retired in the spatial data set.	DateTime	voidable
geometry	The geometry of the land-water boundary, as a curve.	GM_Curve
inspireId	External object identifier of the spatial object.	Identifier
origin	Origin of the land-water boundary.	OriginValue	voidable
waterLevelCategory	Water-level defining the land-water boundary.	WaterLevelValue	voidable

8.5.1.12. Lock (Lock) U.K.

An enclosure with a pair or series of gates used for raising or lowering vessels as they pass from one water level to another.

This type is a sub-type of ManMadeObject.

8.5.1.13. Man-made Object (ManMadeObject) U.K.

An artificial object which lies inside a body of water and has one of the following types of function: - Retains the water; - Regulates the quantity of water; - Alters the course of the water; - Allows watercourses to cross each other.

This type is a sub-type of HydroObject.

This type is abstract.

Attributes of the spatial object type ManMadeObject

Attribute	Definition	Type	Voidability
beginLifespanVersion	Date and time at which this version of the spatial object was inserted or changed in the spatial data set.	DateTime	voidable
condition	The state of planning, construction, repair, and/or maintenance of the structures and/or equipment comprising a facility and/or located at a site, as a whole.	ConditionOfFacilityValue	voidable
endLifespanVersion	Date and time at which this version of the spatial object was superseded or retired in the spatial data set.	DateTime	voidable
geometry	The geometry of the man-made object, as a point, curve or surface.	GM_Primitive	voidable
inspireId	External object identifier of the spatial object.	Identifier
levelOfDetail	Resolution, expressed as the inverse of an indicative scale or a ground distance.	MD_Resolution

F1 8.5.1.14. Ocean Region (OceanRegion) U.K.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 8.5.1.15. Pipe (Pipe) U.K.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 8.5.1.16. Pumping Station (PumpingStation) U.K.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8.5.1.17. Rapids (Rapids) U.K.

Portions of a stream with accelerated current where it descends rapidly but without a break in the slope of the bed sufficient to form a waterfall.

This type is a sub-type of FluvialPoint.

8.5.1.18. River Basin (RiverBasin) U.K.

The area of land from which all surface run-off flows through a sequence of streams, rivers and, possibly, lakes into the sea at a single river mouth, estuary or delta.

This type is a sub-type of DrainageBasin.

8.5.1.19. Shore (Shore) U.K.

The narrow strip of land in immediate contact with any body of water including the area between high and low water lines.

This type is a sub-type of HydroObject.

[ F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .]

Attributes of the spatial object type Shore

Attribute	Definition	Type	Voidability
beginLifespanVersion	Date and time at which this version of the spatial object was inserted or changed in the spatial data set.	DateTime	voidable
composition	The primary type(s) of material composing a spatial object, exclusive of the surface.	ShoreTypeValue	voidable
delineationKnown	An indication that the delineation (for example: limits and information) of a spatial object is known.	Boolean	voidable
endLifespanVersion	Date and time at which this version of the spatial object was superseded or retired in the spatial data set.	DateTime	voidable
[F2 geometry	The geometry of the shore.	GM_MultiSurface	]
inspireId	External object identifier of the spatial object.	Identifier

8.5.1.20. Shoreline Construction (ShorelineConstruction) U.K.

An artificial structure attached to land bordering a body of water and fixed in position.

This type is a sub-type of ManMadeObject.

8.5.1.21. Sluice (Sluice) U.K.

An open, inclined conduit fitted with a gate for regulating water flow.

This type is a sub-type of ManMadeObject.

8.5.1.22. Standing Water (StandingWater) U.K.

A body of water that is entirely surrounded by land.

This type is a sub-type of SurfaceWater.

Attributes of the spatial object type StandingWater U.K.

Attribute	Definition	Type	Voidability
elevation	Elevation above mean sea level.	Length	voidable
meanDepth	Average depth of the body of water.	Length	voidable
surfaceArea	Surface area of the body of water.	Area	voidable

Constraints of the spatial object type StandingWater U.K.

Standing water geometry may be a surface or point

8.5.1.23. Surface Water (SurfaceWater) U.K.

Any known inland waterway body.

This type is a sub-type of HydroObject.

This type is abstract.

Attributes of the spatial object type SurfaceWater

Attribute	Definition	Type	Voidability
beginLifespanVersion	Date and time at which this version of the spatial object was inserted or changed in the spatial data set.	DateTime	voidable
endLifespanVersion	Date and time at which this version of the spatial object was superseded or retired in the spatial data set.	DateTime	voidable
geometry	The geometry of the surface water: - either a curve or surface for a watercourse; - either a point or surface for a standing water.	GM_Primitive
inspireId	External object identifier of the spatial object.	Identifier
levelOfDetail	Resolution, expressed as the inverse of an indicative scale or a ground distance.	MD_Resolution
localType	Provides ‘local’ name for the type of surface water.	LocalisedCharacterString	voidable
origin	Origin of the surface water.	OriginValue	voidable
persistence	The degree of persistence of water.	HydrologicalPersistenceValue	voidable
tidal	Identifies whether the surface water is affected by tidal water.	Boolean	voidable

Association roles of the spatial object type SurfaceWater

Association role	Definition	Type	Voidability
bank	The bank(s) associated to a surface water.	Shore	voidable
drainsBasin	The basin(s) drained by a surface water.	DrainageBasin	voidable
neighbour	An association to another instance of the same real-world surface water in another data set.	SurfaceWater	voidable

8.5.1.24. Watercourse (Watercourse) U.K.

A natural or man-made flowing watercourse or stream.

This type is a sub-type of SurfaceWater.

Attributes of the spatial object type Watercourse U.K.

Attribute	Definition	Type	Voidability
condition	The state of planning, construction, repair, and/or maintenance of a watercourse.	ConditionOfFacilityValue	voidable
delineationKnown	An indication that the delineation (for example: limits and information) of a spatial object is known.	Boolean	voidable
length	Length of the watercourse.	Length	voidable
level	Vertical location of watercourse relative to ground.	VerticalPositionValue	voidable
streamOrder	Number (or code) expressing the degree of branching in a stream system.	HydroOrderCode	voidable
width	Width of watercourse (as a range) along its length.	WidthRange	voidable

Constraints of the spatial object type Watercourse U.K.

[F4 The shores on either side of a watercourse shall be provided (using the bank property) as two separate Shore objects.]

Textual Amendments

F4 Inserted 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.

Watercourse geometry may be a curve or surface

A condition attribute may be specified only for a man-made watercourse

8.5.1.25. Wetland (Wetland) U.K.

A poorly drained or periodically flooded area where the soil is saturated with water, and vegetation is supported.

This type is a sub-type of HydroObject.

[ F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .]

Attributes of the spatial object type Wetland

Attribute	Definition	Type	Voidability
beginLifespanVersion	Date and time at which this version of the spatial object was inserted or changed in the spatial data set.	DateTime	voidable
endLifespanVersion	Date and time at which this version of the spatial object was superseded or retired in the spatial data set.	DateTime	voidable
geometry	The geometry of the wetland, as a surface.	GM_Surface
inspireId	External object identifier of the spatial object.	Identifier
localType	Provides ‘local’ name for the type of wetland.	LocalisedCharacterString	voidable
Tidal	Identifies whether the wetland is affected by tidal water.	Boolean	voidable

8.5.2. Data Types U.K.

8.5.2.1. Hydro Order Code (HydroOrderCode) U.K.

A hydrologically meaningful ‘order code’ for ordering hierarchies of watercourses and drainage basins.

Attributes of the data type HydroOrderCode

Attribute	Definition	Type	Voidability
order	Number (or code) expressing the degree of branching or dividing in a stream or drainage basin system.	CharacterString
orderScheme	A description of the concept for ordering.	CharacterString
scope	An indicator of the scope or origin for an order code (including whether it is national, supranational or European).	CharacterString

8.5.2.2. Width Range (WidthRange) U.K.

The range of a watercourse’s horizontal width along its length.

Attributes of the data type WidthRange

Attribute	Definition	Type	Voidability
lower	Lower bound of width.	Length
upper	Upper bound of width.	Length

8.5.3. Enumerations U.K.

8.5.3.1. Origin (OriginValue) U.K.

An enumeration type specifying a set of hydrographic ‘origin’ categories (natural, man-made) for various hydrographic objects.

Allowed values for the enumeration OriginValue

Value	Definition
natural	An indication that a spatial object is natural.
manMade	An indication that a spatial object is man-made.

8.5.4. Code Lists U.K.

8.5.4.1. Crossing Type (CrossingTypeValue) U.K.

Man-made physical watercourse crossing types.

[F2 The allowed values for this code list comprise only the values in the table below.]

[F3 [F2 Values for the code list] CrossingTypeValue

Value	Definition
aqueduct	A pipe or artificial channel that is designed to transport water from a remote source, usually by gravity, for freshwater supply, agricultural, and/or industrial use.
bridge	A structure that connects two locations and provides for the passage of a transportation route over a terrain obstacle.
culvert	An enclosed channel for carrying a watercourse under a route.
siphon	A pipe used for conveying liquid from one level to a lower level, using the liquid pressure differential to force a column of the liquid up to a higher level before it falls to the outlet.]

8.5.4.2. Hydrological Persistence (HydrologicalPersistenceValue) U.K.

Categories of hydrological persistence of a body of water.

[F2 The allowed values for this code list comprise only the values in the table below.]

[F3 [F2 Values for the code list] HydrologicalPersistenceValue

Value	Definition
dry	Filled and/or flowing infrequently, generally only during and/or immediately after heavy precipitation.
ephemeral	Filled and/or flowing during and immediately after precipitation.
intermittent	Filled and/or flowing for part of the year.
perennial	Filled and/or flowing continuously throughout the year.]

F1 8.5.4.3. Inundation (InundationValue) U.K.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8.5.4.4. Shore Type (ShoreTypeValue) U.K.

Categories of shore area composition.

[ F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .]

[F2 The allowed values for this code list comprise only the values in the table below.]

[F3 [F2 Values for the code list] ShoreTypeValue

Value	Definition
boulders	Large water- or weather-worn stones.
clay	A stiff tenacious fine-grained earth consisting mainly of hydrated aluminosilicates, which become more plastic when water is added and can be moulded and dried.
gravel	Small water-worn or pounded stones.
mud	Soft wet soil, sand, dust, and/or other earthy matter.
rock	Stones of any size.
sand	Granular material consisting of small eroded fragments of (mainly siliceous) rocks, finer than gravel and larger than a coarse silt grain.
shingle	Small, loose, rounded water-worn pebbles, especially as accumulated on a seashore.
stone	Pieces of rock or mineral substance (other than metal) of definite form and size, usually artificially shaped, and used for some special purpose.]

8.5.4.5. Water Level (WaterLevelValue) U.K.

The tidal datum / waterlevel to which depths and heights are referenced.

[F2 The allowed values for this code list comprise only the values in the table below.]

[F3 [F2 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.]

F1 8.6. Hydro - Reporting U.K.

F1 8.6.1. Spatial Object Types U.K.

[ F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 8.6.1.1. WFD Coastal Water (WFDCoastalWater) U.K.

F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 Constraints of the spatial object type WFDCoastalWater U.K.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 8.6.1.2. WFD Ground Water Body (WFDGroundWaterBody) U.K.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 8.6.1.3. WFD Lake (WFDLake) U.K.

F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 Constraints of the spatial object type WFDLake U.K.

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

F1 8.6.1.4. WFD River (WFDRiver) U.K.

F1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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F1 Constraints of the spatial object type WFDRiver U.K.

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F1 8.6.1.5. WFD River Or Lake (WFDRiverOrLake) U.K.

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F1 8.6.1.6. WFD Surface Water Body (WFDSurfaceWaterBody) U.K.

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F1 Attributes of the spatial object type WFDSurfaceWaterBody U.K.

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F1 Constraints of the spatial object type WFDSurfaceWaterBody U.K.

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F1 8.6.1.7. WFD Transitional Water (WFDTransitionalWater) U.K.

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F1 Constraints of the spatial object type WFDTransitionalWater U.K.

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F1 8.6.1.8. WFD Water Body (WFDWaterBody) U.K.

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8.7. Theme-specific Requirements U.K.

8.7.1. Consistency between spatial data sets U.K.

1. Hydrography links, centrelines and nodes shall always be located within the extent of the area representation of the same object. U.K.

2. Connectivity between hydrographic networks across state borders and – where applicable – also across regional borders (and data sets) within Member States shall be established and maintained by the respective authorities, using the cross-border connectivity mechanisms provided by the NetworkConnection type. U.K.

3. All attribution of objects in this schema shall be the same as the equivalent property of that object used for reporting obligations under Directive 2000/60/EC. U.K.

8.7.2. Identifier management U.K.

1. If a geographical name is used as a unique hydrologic ID for an object in this specification then it shall be derived, where possible, from a pan-European Gazetteer or another authoritative, pan-European source. U.K.

2. The localId attribute of the external object identifier of a spatial object shall be the same as the ID used for reporting obligations under Directive 2000/60/EC. U.K.

8.7.3. Modelling of object references U.K.

1. If the same real world object in a data set is exchanged using spatial objects from more than one of the Hydrography application schemas then these spatial objects shall carry either the same, unique, geographical name or the same hydrographic thematic identifier. U.K.

2. When linear referencing is used in hydrographic Network data, the position of referenced properties on links and link sequences shall be expressed as distances measured along the supplied geometry of the underlying link object(s). U.K.

8.7.4. Geometry representation U.K.

1. If spatial objects are provided at different spatial resolutions, the spatial resolution must be specified for each spatial object using the levelOfDetail attribute where applicable. U.K.

2. Watercourse links shall intersect wherever a connection exists between the real world phenomena they represent. No intersections shall be created at crossing network elements when it is not possible for water to pass from one element to another. U.K.

3. In a hydrographic network data set which contains nodes, these nodes shall only be present where Watercourse Links connect or end. U.K.

4. The geometry shall be the same as the geometry used for reporting obligations under Directive 2000/60/EC. U.K.

8.7.5. Use of the DelineationKnown Attribute U.K.

1. The attribute delineationKnown shall not be used to indicate that the accuracy / precision of a certain geometry is low; this indication should be given using the appropriate data quality element(s). U.K.

2. The attribute delineationKnown shall not be used to indicate a change of geometry over time where this change of geometry is known. U.K.

8.7.6. Centrelines U.K.

The centrelines of watercourse objects shall fall within the extent of the physical real world object that they represent if the Watercourse Link is indicated as not being ‘fictitious’.

8.7.7. Ensuring Network Connectivity U.K.

1. Wherever a connection exists in a hydrographic network, all connected link ends and the optional node that take part in this connection have to be positioned at a distance of less than the connectivity tolerance from each other. U.K.

2. Link ends and nodes that are not connected shall always be separated by a distance that is greater than the connectivity tolerance. U.K.

3. In data sets where both transport links and nodes are present, the relative position of nodes and link ends in relation to the specified connectivity tolerance shall correspond to the associations that exist between them in the data set. U.K.

8.8. Layers U.K.

Layers for the spatial data theme Hydrography

[F2 Layer Type	Layer Title	Spatial object type(s)
HY.Network	Hydrographic Network	HydroNode, WatercourseLink
HY.PhysicalWaters.Waterbodies	Waterbodies	Watercourse, StandingWater
HY.PhysicalWaters.LandWaterBoundary	Land-Water Boundaries	LandWaterBoundary
HY.PhysicalWaters.Catchments	Catchments	DrainageBasin, RiverBasin
HY.PhysicalWaters.HydroPointOfInterest	Hydro Points of Interest	Rapids, Falls
HY.PhysicalWaters.ManMadeObject	Man-made Objects	Crossing, DamOrWeir, Embankment, Lock, Ford, ShorelineConstruction, Sluice
HY. PhysicalWaters.Wetland	Wetlands	Wetland
HY. PhysicalWaters.Shore	Shores	Shore]