Note: incomplete, under construction

These features are now consolidated in a more compact list.

Feature List

From use-cases:

Water Well
Screen
Casing
Sealing
Construction Details
Well Log
Spring
Aquifer
Geologic Unit
River Basin District
Groundwater Body
Protected area
Groundwater Discharge
Groundwater Level
Groundwater Chemistry
Groundwater Biology

Features (or proterties) from GWML 1 not listed in the use cases

Packer Testing
Pump Testing
Slug Testing
Tracer Testing
Hydrogeologic Unit Categorisation
Groundwater Body (partially overlaps the use cases)
Aquifer System
Aquiclude
Aquitard
Hydrogeologic unit
Atmospheric Water Body
WaterQualityMeasurement (partially overlaps the use cases)
Water Budget
Water Flow
Water Flow Direction
Reservoir
Filtration
Filtration Component
Pump
Well Pump Installation
Cone of Depression
Zone of Contribution
Zone of Influence
Drawdown
Monitoring site
Well Field
Well Borehole Details
Groundwater divide
Hydraulic Boundary
Hydrogeological Context
Hydrogeological Framework
Piezometric Surface
Recharge Area

Features from INSPIRE HydrogeologyCore model, draft version 2.9.9 (With small corrections):

ActiveWell
Aquiclude
Aquifer
AquiferSystem
Aquitard
GroundwaterBody
HydrogeologicalObject
HydrogeologicalObjectManMade
HydrogeologicalObjectNatural
HydrogeologicalUnit
ObservationWell
Well

Selected features from INSPIRE HydrogeologyExtension model, draft version 2.9.9 (With small corrections):

FracturedAquifer
KarsticAqiufer
HG_FeatureOccurrence
HG_WellLog
HG_LogInterval
HG_ConeOfDepression
HG_InfluenceZone
HG_ProtectionZone
HydrogeologicalZone
MineralGroundWaterBody
MineralSpring
MineralWaterAbstractionWell
ThermalGroundWaterBody
ThermalSpring
ThermalWaterAbstractionWell
HG_WellTimeSeriesObservation

-- Main.JanuszMichalak - 16 Dec 2012

* Note for the purposes of the tables below a "Feature" has a location

Scope	Feature Name	Attribute Name	Data Type	Entity Definition
	Water Well	N/A	N/A
		id	URI	the id of the well
		contact	metadata	contact for the well
		name	text	the name of the well
		location	coordinate	geographic location of well
		elevation	number uom = m above sea level	elevation of the well
		length	number uom = m	total length of the well
		water level	number uom = m	measured water depth
		well purpose	text	intended use of the well
		well status	controlled vocabulary	the status of the water well (e.g. abandoned, decommissioned, flowing, ...)
		...
	Screen	N/A	N/A
		screenTop	number uom = m	reference to top of screen depth
		screenBottom	number uom = m	reference to bottom of screen depth
		...
	Casing	N/A	N/A
		casingTop	number uom = m	reference to top of casing depth
		casingBottom	number uom = m	reference to bottom of casing depth
		...
	Sealing	N/A	N/A
		sealingTop	number uom = m	reference to top of sealing depth
		sealingBottom	number uom = m	reference to bottom of sealing depth
		...
	Construction Details	N/A	N/A
		drill date	datetime	date of drilling for the well
		...
	Well Log	N/A	N/A
		id	URI	the ID of the log element
		logTop	number uom = m	reference to the top of a log element
		logBottom	number uom = m	reference to the bottom of a log element
		lithologies	text	identification of the lithologies found in the log element
		porosity	number	identification of the porosity of the earth material in the log element
		hydraulic conductivity	number	identification of the hydraulic conductivity of the earth material in the log element
		...
	Spring	N/A	N/A
		name	text	the name of the spring
		...
	Aquifer	N/A	N/A
		id	URI	the id of the aquifer
		name	text	name of the aquifer
		area	number uom = km2	area of an aquifer
		confinement	text	description of the confinement of an aquifer
		media	text	identification of the aquifer media
		water storage	number uom km3	volume of water stored in an aquifer
		sediment thickness	number uom m	thickness of the unconsolidated material in an aquifer
		aquifer thickness	number uom m	thickness of the aquifer
		porosity	number	porosity of the aquifer material
		conductivity	number	conductivity of the aquifer material
		recharge	number uom mm/yr	annual recharge rate of the aquifer
		discharge	number uom mm/yr	annual discharge rate of the aquifer
		yield	number uom km3	sustainable yield of an aquifer
		usage type	text	identification of the various groundwater usages
		groundwater quality	text	identification of the groundwater quality
		physical vulnerability	text	identification of the physical vulnerability to contamination of the aquifer
		threats	text	identification of the various aquifer threats
		...
	Geologic Unit	N/A	N/A
		formations	text	Identification of the formations in a geologic unit
		lithologies	text	Identification of the lithologies in a geologic unit
		...
	River Basin District	N/A	N/A
		id	URI	id of the watershed
		national code	text	Code used to identify the watershed
		parent watershed id	URI	id of the parent watershed
		name	text	name of the watershed
		area	number uom km2	area covered by the watershed
		...
	Groundwater Body	N/A	N/A
		id	URI	id for the groundwater body
		national code	text	code used to identify the groundwater body
		name	text	name identifying the groundwater body
		protected area association	text	identification of the association responsible for the protection of the groundwater body
		pressures	text	identification of the pressures the groundwater body is suffering from
		impacts	text	identification of the impacts on the groundwater body
		reversal trend	text	identification of reversal trends the groundwater body is experiencing
		trend upward	text	identification of upward trends the groundwater body is facing
		hydrogeological characteristics		hydrogeological characteristics: GW layer, area, depth, thickness, depth range, geological formation, capacity, link surface water, link eco system
		groundwater layer	numeric ??	TBD
		area	numeric	area of the groundwater body
		depth	numeric	depth of the groundwater body
		depth range	numeric	two values defining the range of the depth of the groundwater body
		thickness	numeric	thickness of the groundwater body
		geological formation	text	identification of the geological formation associated with the groundwater body
		capacity	numeric	capacity of the groundwater body
		linked water surface	text	identification of the linked water surface with the groundwater body
		linked ecological system	text	identification of the linked ecological system with the groundwater body
		quantitative status	text	statement regarding the quantitative status of the groundwater body
		qualitative chemical status	text	statement regarding the qualitative chemical status of the groundwater body
		...
	Protected area	N/A	N/A
		id	URI	identification of the protected area
		status	text	status of the protected area
		type	text	type of protection for the protected area
		association type	text	type of association for the protected area
		...
	Groundwater Discharge	N/A	N/A
		id	URI	id of the groundwater discharge feature
		name	text	name of the discharge feature
		type	text	type of discharge feature (point discharge (springs), line discharge (stream baseflow), areal discharge (seep, wetland, diffuse, biological))
		status	text	Environmental status of the discharge feature
		...
	Groundwater Level	N/A	N/A
		id	URI	id of the groundwater level
		type	text	type of groundwater level (phreatic, potentiometric) -- include static and dynamic groundwater level.
		value	numeric	groundwater level value
		...
	Groundwater Chemistry	N/A	N/A
		id	URI	identification of the chemistry sample
		date	date	date when the sample was taken + date when sample was analysed ???
		method	text	description of the analytical method
		field analysis	text	field analysis results (pH, EC, DO, etc.)
		lab analysis	text	laboratory analysis results (major ions, minor ions, elements, etc.)
		isotopes	text	identification of recognised isotopes
		tracers	text	identification of tracers in groundwater
	See here for example of laboratory model	...
	Groundwater Biology	N/A	N/A
		microbiology	text	identification of microbiological agents in groundwater
		stygofauna	text	identification of stygofauna in groundwater
	See here for example of laboratory model	...

Features (or properties) in GWML 1 not listed in the use cases

*
Note for the purposes of the tables below a "Feature" has a location

Feature Name	Attribute Name	Data Type	Entity Definition
Dependent Observation Calculation	N/A	N/A	Calculation that depend from another set of observation
	Groundwater Analysis Result	text	Report a collection of values related to groundwater quality (quantitative and qualitative).
	Result Element	text	This class is used to represent one element of the results of a groundwater analysis.
	...
Packer testing, pump testing, slug testing 	N/A	N/A	Packer tests consist of isolating specific sections (usually 10 ft) of a bedrock borehole with inflatable packers (bladders) so that water-quality samples can be collected and aquifer tests can be conducted. An aquifer test (or a pumping test) is conducted to evaluate an aquifer by "stimulating" the aquifer through constant pumping, and observing the aquifer's "response" (drawdown) in observation wells. A slug test is a particular type of aquifer test where water is quickly added or removed from a groundwater well, and the change in hydraulic head is monitored through time, to determine the near-well aquifer characteristics.
	Groundwater test type	text	Code used to refer to a particular hydraulic test, defined in the hydraulicTestCode enumeration.
	Raw Result	text	Pointer to a file where the raw results are (image, file, raw data). Raw, uninterpreted data that is used to produce a result for the Observation
	Duration	time	Duration on which the pump testing is performed.
	Rate	numeric	Rate at which the water is pumped during the pumping test.
	...
Tracing test	N/A	N/A	Tracer tests are used to "trace" the path of flowing water. Tracer tests are conducted in pipelines, lakes, rivers and groundwater. The tracer chemical must be dissolved in water at concentrations that do not significantly change the aqueous density.
	Groundwater Test Type	text	Code used to refer to a particular hydraulic test, defined in the hydraulicTestCode enumeration.
	Raw Result	text	Pointer to a file where the raw results are (image, file, raw data). Raw, uninterpreted data that is used to produce a result for the Observation
	...
Hydrogeologic unit categorisation	N/A	N/A	The GWML Categorisation package is used to define classification of hydrogeologic units mostly for local planning purposes.
	Aquifer Vulnerability Classification	text	Two concepts have been introduced that can affect groundwater quality. The land-use activities that take place at the surface can affect groundwater quality, and the physical or geologic characteristics of the vadose zone and aquifer can provide protection from infiltrating contaminants.
	Categorisation	text	Custom classification applied to a hydrogeologic Unit. This classification is usually based on local concerns, such as vulnerability, water availability or other classes related to water usage and protection.
	Hydrogeologic Classification	text	A class used to specify a classification based on characteristic hydrology and geological settings.
	...
Groundwater Body (partially detailed in the use cases)	N/A	N/A	A distinct volume of groundwater within an aquifer or aquifers (Vogt, 2002). The equivalent in the European Water Framework Directive (2000/60/CE, 2000) is "Body of groundwater" defined exactly in the same way.
	Volume	numeric	Volume of water present in a water body.
	Water Property Description (1)	text	Water Property description are the properties of the HydrogeologicUnit regarding its water content. Two aspects are considered, First the quantity (the amount of water that is present, as opposed to the amount of water that can potentially be there) and second, the quality of that water.
	Metadata	text	Metadata used to describe the water properties.
	Validity Time	time	Time instant or period at which this value has any validity.
	Water Quality Description (1.1)	text	A list of common properties related to water quality assessment. Head of a substitution list that include Qualitative and Quantitative water quality properties.
	Norm Compliance Result	text	Evaluation of the compliance of this result compared to the norm (eg, below the norm, above the norm, meeting, exceeding..)
	Norm Documentation	text	Identification of a norm (if any) that is should be considered to interpret the result.
	Qualitative Quality Description (1.1.1)	text	A normative quality description is an assesment based upon some guideline edited by a gouvernment or a quality standard. It can include things such as "odor" or "color".
	Quality Topic	text	What is being measured (ie, hardness, suspended material, odor or color)
	Quality Assessment	text	Qualitative assesment of the water, using a normative quality descriptor.
	Water Composition Description (1.1.2)	text	Used to describe the composition of water.
	Composition Category	text	Describe what kind of concentration is represented, such as "Natural quality", "suitability for irrigation", etc..
	Salinity Category	text	This property refers to the type of salinity that is present in the water.
	Water Composition Component (1.1.2.1)	text	Used to describe a component that can be present in groundwater
	Concentration	numeric	In chemistry, concentration is the measure of how much of a given substance there is mixed with another substance.
	Colloid	text	A colloid is a type of mechanical mixture where one substance is dispersed evenly throughout another. This attribute may be used to name a colloid.
	Colloidal Type	text	A type of colloid, either sol, foam or emulsion.
	Saturation	text	This attribute refers the the saturation of a dissolved component into ground water. The domain values are "pure, unsaturated, saturated, sursaturated".
	Salinity Source	text	The salinity can come from various sources; sea water instrusion (actual or ancien), dissolution of host rock or dissolution of salt during recharge (eg, water circulating through evaporates)
	Dissolved Chemical	text	Name of a dissolved chemical component in groundwater that is not a salt.
	Dissolved Salt	text	Name of a salt component dissolved in groundwater.
	Water Quantity Description (1.2)	text	Used to describe the the quantity of water that is present in an aquifer.
	Qualitative Water Quantity	text	Qualitative description of the water quantity (such as 'wet' or 'dry'). Often the only information recorded in some water well records
	Water Volume Description (1.2.1)	text	Used to describe the volume of water present in an aquifer.
	Volume Type	text	Describes the type of volume that we are refering to eg: dynamicVolume, specificVolume, theoricVolume, gwStorage (static)
	Volume	numeric	Total volume of water in an aquifer.
	Water Yield Description (1.2.2)	text	Used to describe the different yield parameters of an aquifer.
	Safe Yield	numeric	With reference to either a surface- or ground-water supply, the rate of diversion or extraction for Consumptive Use which can be maintained indefinitely, within the limits of economic feasibility, under specified conditions of water-supply development.
	Specific Yield	numeric	Specific yield, also known as the drainable porosity, is a ratio, less than or equal to the effective porosity, indicating the volumetric fraction of the bulk aquifer volume that a given aquifer will yield when all the water is allowed to drain out of it under the forces of gravity.
	Sustainable Yield	numeric	The groundwater extraction regime, measured over a specified planning timeframe, that allows acceptable levels of stress and protects dependent economic, social, and environmental values.
	Water Age Description (1.3)	text	The age of the water is generally (always?) the age of infiltration. The infiltration can be in an aquifer different from the aquifer it actually resides in (for example, water infiltrated in a surface aquifer and migrated slowly in a deeper - rock perhaps - aquifer).
	Period of Residence	time	The time period in which a unit of water resides in an aquifer.
	Geologic Event	text	The age of the water, expressed as a geologicEvent. Refer to http://www.geosciml.org/documentation/geosciml/2.0_rc3/GeoSciML/GeologicAge/GeologicEvent.html for a complete description of a geologicEvent.
Aquifer System	N/A	N/A	Collection of hydrogeological units composing a system of interacting components. By virtue of being a GeologicUnit, it derives from it the 'part' property.
	name	text	Name of an aquifer system
	...
Aquiclude	N/A	N/A	Impermeable beds of geologic material that hinder or prevent groundwater movement.
	name	text	Name of an aquifer system
	...
Aquitard	N/A	N/A	A saturated, but poorly permeable bed that impedes ground-water movement and does not yield water freely to wells, but which may transmit appreciable water to or from adjacent aquifers and, where sufficiently thick, may constitute an important ground-water storage unit.
	name	text	Name of an aquitard
	...
Hydrogeologic Unit	N/A	N/A	Describes the various properties of hydrogeologic units.
	Hydrogeologic Description	text	Properties of the rock that is relevant to the groundwater
	Capacity	numeric	Volumetric capacity of an aquifer to hold water.
	Hydraulic Conductivity	numeric	Hydraulic conductivity can be measured by applying Darcy's law on the material. Such experiments can be conducted by creating a hydraulic gradient between two points, and measuring the flow rate.
	Saturation	numeric	This property displays the saturation of water in a given material.
	Storativity	numeric	Storativity is the volume of water released from storage per unit decline in hydraulic head in the aquifer, per unit area of the aquifer.
	rank	text	TBC
	...
Atmospheric Water Body	N/A	N/A	Quatity of water, in gaseous, liquid or solid phase, present in the atmosphere.
	Volume	numeric	Volume of water present in a water body.
	...
Water Quality Measurement	N/A	N/A	Partially equivalenent to groundwater chemistry from the use cases
	Calculation	text	Water Quality procedure (from Environment Canada)
	Guideline	text	Prescribed methodology
	Water Quality Index	text	Classification of water quality through an index. This class is a subclass a measurement class.
	Water Specimen	text	This class is a sub-class of a specimen class, which is defined as follows "A Specimen is some physical material sampled from a specified location, typically associated with a Site, such as a Station, a location or interval within a Section, or a location or extent from a DescriptionExtent ".
	...
Water Budget	N/A	N/A	An accounting of the inflow, outflow, and storage changes of water in a hydrologic unit.
	Metadata	text	Metadata associated to a water budget.
	Validity		Validity time of the water budget
	...
Water Flow	N/A	N/A	Movement of subsurface water in the saturated zone from areas of recharge to areas of discharge.
	Flow Process	text	Identification of a particular process in the groundwater cycle.
	Quantity	numeric	Quantity of water transferred during a particular water flow process.
	...
Water Flow Direction	N/A	N/A	Measurement of the direction of the water flow, at a specific location.
	Result	numeric	A direction of the water flow, expressed as a CGI_Vector with a direction and a magnitude.
	...
Reservoir	N/A	N/A	A reservoir is, most broadly, a place or hollow vessel where fluid is kept in reserve, for later use. Includes atmospheric reservoir, biologic reservoir, geologic reservoir, surface reservoir, transit reservoir and utility reservoir.
	Capacity	numeric	Capacity of a reservoir to contain water, expressed as a numeric value and the unit of measurment.
	...
Filtration	N/A	N/A
	Filter Placement Method	text	Process defining the filter placement method. Can be tremie or pour down.
	Filtration Medium	text	Type of filtration mechanism used in the filtration device. Terms can be Natural, Filter pack or Formation stabilizer.
	...
Filtration Component	N/A	N/A	Type of material used to filter the water.
	Position	geometry	This attribute is used to reference the shape of the samplingCurve from which the WaterWell derives.
	Grain Size	numeric	Size of the particles of the filtration material.
	Material	text	Identification of the material used in the filtration device. Gravel, pit run, silica sand, washed sand, crushed rock, artificial (unspecified) unknown, other
	...
Pump	N/A	N/A	A water well pump is a pump that is used in extracting water from a water well.
	Make	text	Brand of the pump
	Model	text	Model of the pump
	Pump Capacity	numeric	Capacity of the pump, expressed as a measurement type (value and UOM)
	Pump Type	text	Identification of the type of pump
	Riser Pipe Diameter	numeric	Identification of the diameter of a riser pipe used in a water pump
	...
Well Pump Installation	N/A	N/A	Installation of a pump to a water well.
	Period	time	Period at which the device has been installed.
	Intake Depth	numeric	Depth of the intake of the well, expressed as a value and UOM.
	...
Cone of Depression	N/A	N/A	A depression in the groundwater table or potentiometric surface that has the shape of an inverted cone and develops around a well from which water is being withdrawn. Its trace (perimeter) on the land surface defines the zone of influence of a well. Also called pumping cone and cone of drawdown.
	ID	URI	Identification of the cone of depression
	Centered At	geometry	The planimetric localization of the center of the cone of depression.
	Depth	numeric	The depth of a cone of depression in an aquifer.
	...
Zone of Contribution	N/A	N/A	The area surrounding a pumping well, spring, or tunnel that encompasses all areas and features that supply groundwater to the well spring, or tunnel.
	ID	URI	Identification of the zone of contribution
	...
Zone of Influence	N/A	N/A	The area of influence, or cone of depression formed when pumping a well or well field.
	ID	URI	Identification of the zone of influence
	...
Drawdown	N/A	N/A	The vertical distance groundwater elevation is lowered, or the amount head is reduced, due to the removal of groundwater. Also the decline in potentiometric surface caused by the withdrawal of water from a hydrogeologic unit. The distance between the static water level and the surface of the cone of depression. A lowering of the water table of an unconfined aquifer or the potentiometric surface of a confined aquifer caused by pumping of groundwater from wells.
	Distance	numeric
	...
Monitoring Site	N/A	N/A	A site where a sampling is taken for monitoring various properties.
	ID	URI	Identification of the monitoring site.
	...
Well Field	N/A	N/A	A tract of land which contains a number of wells for supplying a large municipality or irrigation district.
	ID	URI	Identification of the well field.
	...
Well Borehole Details	N/A	N/A	Used to details specific characteristics of well boreholes.
	Drilling Fluid	text	Identification of the drilling fluid used for the well borehole.
	...
Groundwater Divide	N/A	N/A	The boundary between two adjacent groundwater basins, which is represented by a high point in the water table.
	...
Hydraulic Boundary	N/A	N/A	A hydrologic feature that prevents the flow of groundwater. Examples include groundwater divides or low permeability material that impedes groundwater flow.
	...
Hydrogeological context	N/A	N/A	General information about the hydrogeologic units, the regional geology, soils, etc that is part of a framework.
	description	text	Description of the context.
	...
Hydrogeological Framework	N/A	N/A	A collection of hydrogeological units which forms a hydrogeological context.
	hguID	URI	Identification of the hydrogeological units
	...
Piezometric Surface	N/A	N/A	A surface that represents the level to which water will rise in tightly cased wells. If the head varies significantly with depth in the aquifer, then there may be more than one potentiometric surface. The water table is a particular potentiometric surface for an unconfined aquifer.
	...
Recharge Area	N/A	N/A	The surface and subsurface area surrounding a water well or wellfield through which contaminants are reasonably likely to move toward and reach such water well or well field.
	ID	URI	Identification of the zone
	...

-- Main.BoyanBrodaric - 27 Nov 2012

-- Main.BruceSimons - 27 Nov 2012

-- Main.FrancoisLetourneau - 14 dec 2012

Features from INSPIRE HydrogeologyCore model, draft version 2.9.9 (With small corrections):

Feature Name	Attribute Name	Data Type	Entity Definition
ActiveWell (subtype of Well)	N/A	N/A	A well influencing the groundwater resources (or state)of the groundwater body within the aquifer. Description: The most common examples of Active Well are: extracting, artificial recharging, or dewatering wells. Note: ActiveWell by extracting, recharging or dewatering influences and changes the state of groundwater body.
	activityType	WellActivityType (CodeList)	The type of activity carried out by the well. Description: Indicates if the well is used for extracting, recharging, dewatering etc of the groundwater resources.
Aquiclude (subtype of HydrogeologicalUnit) 	N/A	N/A	An impermeable body of rock or stratum of sediment that acts as a barrier to the flow of groundwater. Description: A formation which, although porous and capable of absorbing water slowly, will not transmit water fast enough to furnish an appreciable supply for a well or spring. Aquicludes are characterized by very low values of "leakage" (the ratio of vertical Hydraulic Conductivityto thickness), so that they transmit only minor inter-aquifer flow and also have very low rates of yield from compressible storage. Therefore, they constitute boundaries of aquifer flow systems.
Aquifer (subtype of HydrogeologicalUnit)	N/A	N/A	A wet underground layer of water-bearing permeable rock or unconsolidated materials (gravel, sand, silt, or clay) from which groundwater can be usefully extracted using a water well. It can be zone of fractures related to Geologic Structure – a part of geological formation. Description: An underground geological formation able to store and yield water. Groundwater body flows through aquifers.
	*aquiferType*	AquiferType (enumeration)	The type of aquifer. Description: Water in an Aquifer is, or is not, under pressure. Based on that unconfined, confined, artesian, or subartesian types are distinguished.
	*mediaType*	AquiferMediaType (enumeration)	The classification of the medium in which the groundwater flow occurs.
	*isExploited*	Boolean (voidable)	Indicates if groundwater from aquifer is exploited by wells or intakes
	*isMainInSystem*	Boolean (voidable)	Indicates if aquifer is the main useful aquifer in the aquifer system
	*vulnerabilityToPollution*	QuantityValue (voidable)	DRASTIC index value or interval of values determining the potential degree of aquifer risk arising from the geological structure, hydrogeological conditions and the existence of real or potential source of contamination. Description: A single value should be used if it is determined directly from the DRASTIC method. If attribute data comes from another data source which is expressed by categorized items, for example: low, moderate or high, interval should be used expressed by lowest and highest value of category. EXAMPLE: ‘Moderate’ means interval from 101 to 140.
	*permeabilityCoefficient*	QuantityValue (voidable)	The volume of an incompressible fluid that will flow in unit time through a unit cube of a porous substance across which a unit pressure difference is maintained. Description: The parameter represents the hydraulic conductivity of a rock container. Describes the ease with which water can move through pore spaces or fractures. It depends on the intrinsic permeability of the material and on the degree of saturation. Note: Because of their high porosity and permeability, sand and gravel have higher hydraulic conductivity than clay or unfractured granite aquifers.
	*storativityCoefficient*	QuantityValue (voidable)	The ability of an aquifer to store water.
	*hydroGeochemicalRockType*	HydroGeochemicalRockTerm (CodeList, voidable)	The rock type with respect to the soluble rock components and their hydrogeochemical influence of groundwater. Description: Defines the prevailing geochemical character of natural groundwater within the Aquifer.
AquiferSystem (subtype of HydrogeologicalUnit)	N/A	N/A	A collection of aquifers and aquitards, which together constitute the environment of groundwater - "communicating vessels", that are filled or can be filled with water. Description: Attributes of Aquifer System and its components determine the feasibility of water collection, its movement, as well as the impact on its chemical state. Note: The Aquifer System components and their attributes (including geometry) are relatively stable over time except in special cases.
	*isLayered*	Boolean (voidable)	Indicates if the AquiferSystem consists of more than one layer.
Aquitard (subtype of HydrogeologicalUnit)	N/A	N/A	A saturated, but poorly permeable bed that impedes ground-water movement. Description: It does not yield water freely to wells, but may transmit appreciable water to or from adjacent aquifers and, where sufficiently thick, may constitute an important ground-water storage unit. Aquitards are characterized by values of leakance that may range from relatively low to relatively high. A really extensive aquitard of relatively low leakance may function regionally as boundaries of aquifer flow systems.
	*approximatePermeabilityCoefficient*	QuantityValue (voidable)	The parameter represents the hydraulic conductivity of a poorly permeable rock or other formation. In that case, a value of permeability is most often approximate.
	*approximateStorativityCoefficient*	QuantityValue (voidable)	The ability of an aquitard to store water.
GroundwaterBody	N/A	N/A	A distinct volume of groundwater within an aquifer or system of aquifers, which is hydraulically separated from nearby groundwater bodies. Description: Groundwater bodies form the principal management units under the European Water Framework Directive (2000/60/CE, 2000). They should be hydraulically continuous entities, and must be defined on the basis of flow or abstraction, and are inextricably linked to surface water bodies.
	*Id*	Identifier	External object identifier of the spatial feature. Note: An external object identifier is a unique object identifier published by the responsible body, which may be used by external applications to reference the spatial feature. The identifier is an identifier of the spatial feature, not an identifier of the real-world phenomenon.
	*approximateHorizontalExtend*	GM_Surface (voidable)	The geometry defining the approximate boundary of the GroundWaterBody.
	*conditionOfGroundWaterBody*	ConditionOfGroundwater (enumeration)	The approximate degree of change to groundwater as a result of human activity.
	*mineralization*	WaterTypeValue (voidable)	One of the main chemical characteristics of water. A value is a sum of all water chemical concentration components.
	*piezometricState*	PiezometricState (voidable, dataType)	Specifies the piezometric state of the GroundwaterBody.
	*beginLifespanVersion*	DateTime (lifeCycleInfo, voidable)	Date and time at which this version of the spatial object was inserted or changed in the spatial data set.
	*endLifespanVersion*	DateTime (lifeCycleInfo, voidable)	Date and time at which this version of the spatial object was superseded or retired in the spatial data set.
HydrogeologicalObject (Abstract)	N/A	N/A	An abstract class for man-made facilities or natural features that have an interaction with the hydrogeological system. Description: Hydrogeological objects may be natural (eg. spring) or the manmade (eg. wells). The vast majority of hydrogeological objects are manmade. Dynamic object can change state of groundwater body and as consequence state of flow system.
	*Id*	Identifier	External object identifier of the spatial feature. Note: An external object identifier is a unique object identifier published by the responsible body, which may be used by external applications to reference the spatial feature. The identifier is an identifier of the spatial feature, not an identifier of the real-world phenomenon.
	*geometry*	GM_Primitive	The geometry defining the spatial location of the HydrogeologicalObject.
	*name*	PT_FreeText (voidable)	The name or code of the HydrogeologicalObject.
	*description*	PT_FreeText (voidable)	The description of the HydrogeologicalObject.
	*beginLifespanVersion*	DateTime (lifeCycleInfo, voidable)	Date and time at which this version of the spatial object was inserted or changed in the spatial data set.
	*endLifespanVersion*	DateTime (lifeCycleInfo, voidable)	Date and time at which this version of the spatial object was superseded or retired in the spatial data set.
HydrogeologicalObjectManMade (abstract, subtype of HydrogeologicalObject)	N/A	N/A	A man-made hydrogeological object. Description: Examples of manmade hydrogeological objects are: well, groundwater intake, groundwater monitoring station or monitoring well.
	*validFrom*	DateTime (lifeCycleInfo, voidable)	Official date and time the hydrogeological object was/will be legally established. Note: This is the date and time the register reference can be used in legal acts.
	*validTo*	DateTime (lifeCycleInfo, voidable)	Date and time at which the hydrogeological object legally ceased/will cease to be used. Note: This is the date and time the register reference can no longer be used in legal acts.
	*statusCode*	StatusCodeType (codeList, voidable)	A code defining the formal status of a HydrogeologicalObjectManMade.
HydrogeologicalObjectNatural (subtype of HydrogeologicalObject) 	N/A	N/A	HydrogeologicalObject which was created by natural processes. Description: Examples of natural hydrogeological objects are: a source, vanishing point and geyser.
	*naturalObjectType*	NaturalObjectType (codeList)	The type of natural hydrogeological object.
	*waterPersistence*	WaterPersistenceValue (codeList, voidable)	The degree of persistence of water flow.
	*approximateQuantityOfFlow*	Quantity Value (voidable)	An approximate value defining the water yield in a natural object. Description: The discharge of water flow for a certain cross-section per time unit.
HydrogeologicalUnit (abstract)	N/A	N/A	A part of the lithosphere with distinctive hydraulic parameters for water storage and conduction.
	*Id*	Identifier	External object identifier of the spatial feature. Note: An external object identifier is a unique object identifier published by the responsible body, which may be used by external applications to reference the spatial feature. The identifier is an identifier of the spatial feature, not an identifier of the real-world phenomenon.
	*approximateHorizontalExtend*	GM_Surface	The geometry defining the boundary of the HydrogeologicalUnit.
	*name*	PT_FreeText (voidable)	The name or code of the HydrogeologicalUnit.
	*description*	PT_FreeText (voidable)	The description of the HydrogeologicalUnit
	*approximateDepth*	QuantityValue (voidable)	The approximate depth of the HydrogeologicalUnit occurrence.
	*approximateThickness*	QuantityValue (voidable)	The approximate thickness of the HydrogeologicalUnit.
	*beginLifespanVersion*	DateTime (lifeCycleInfo, voidable)	Date and time at which this version of the spatial object was inserted or changed in the spatial data set.
	*endLifespanVersion*	DateTime (lifeCycleInfo, voidable)	Date and time at which this version of the spatial object was superseded or retired in the spatial data set.
ObservationWell (subtypeof Well)	N/A	N/A	A well drilled in a selected location for the purpose of observing parameters such as water hydraulic state or water chemistry changes. Description: Class ObservationWell realizes class ObservationWell from ISO 19156 standard in hydrogeology domain.
	*observationType*	WellObservationType (enumeration)	ObservationWell can be a well or piezometer which allow to carry out monitoring and measurement of groundwater (quantitative or chemical) state. Description: The station measurements are used (or not) for EU Water Framework Directive purposes.
Well (abstract, subtype of HydrogeologicalObjectManMade)	N/A	N/A	An excavation where the intended use is for location, acquisition, development, or artificial recharge of groundwater. Source: GWML1

Selected features from INSPIRE HydrogeologyExtension model, draft version 2.9.9 (With small corrections):

Feature Name	Attribute Name	Data Type	Entity Definition
FracturedAquifer (subtype of Aquifer)	N/A	N/A
	riginOfFractures	OriginOfFractures (codeList)	-- Definition -- Genesis of cracks forming FracturedSystem, for example: - related to the fault zone, - caused by weathering processes, - other processes.
KarsticAqiufer (subtype of Aquifer)	N/A	N/A
	soluteRockType	SoluteRockType (codeList)	-- Definition -- Determination of the chemical composition of rocks creating karst processes and, consequently, the nature of the voids that collect water and allow it to flow.
HG_FeatureOccurrence	N/A	N/A	-- Definition -- HydrogeologicalFeatureAppearence class is a geometric representation of HydrogeologicalFeature calaas. HydrogeologicalFeature instance (object) could be represented by many various instances of HydrogeologicalFeatureAppearence class. -- Note -- Class equivalent to HydrogeologicMappedFeature in GWML model and GeologicMappedFeature in GeoSciML: "Mapped feature more oriented on spatial temporal (although geometries could handle this). A physical hydrogeologic feature represented on a map." Here, meaning of this class is wider then in GWML and similar to MappedFeature class in GeoSciML: A MappedFeature is part of a geological interpretation. It provides a link between a notional feature (description package) and one spatial representation of it, or part of it. (Exposures, Surface Traces and Intercepts, etc) * the specific bounded occurrence, such as an outcrop or map polygon * the Mapped Feature carries a geometry or shape o the association with a Geologic Feature (legend item) provides specification of all the other descriptors o the association with a Sampling Feature provides the context and dimensionality A Mapped Feature is always associated with some sampling feature - e.g. a mapping surface, a section, a Borehole (see BoreHolesAndObservation) etc. As noted on the diagram, if the associated sampling feature is a Borehole, then the shape associated with the MappedFeature will usually be either a point or an interval. This reconciles the 2-D ("map", section) and 1-D (borehole, traverse) viewpoints in a common abstraction."
	geometry	HG_Geometry (union)	-- Definition – Common data union for geometry of feature. -- Note -- In GML application it is realised by choice element. XML Schema choice element allows only one of the elements contained in the <choice> declaration to be present within the containing element.
	sourceOfGeome	HG_SourceOfGeometry (codeList)	-- Definition -- Determination of the feature geometry information source or the way of geometry mark.
	Id	Identifier	XXX
	description	PT_FreeText
	categoryOfGeometry	HG_CategoryOfGeometry (codeList)	
HG_WellLog	N/A	N/A
	interval	HG_LogInterval (class)
HG_LogInterval	N/A	N/A
	PermeabilityCoefficient	QuantityValue (voidable)
	torativityCoefficient	QuantityValue (voidable)
	mediaType	AquiferMediaType (codeList, voidable)
	vulnerabilityToPollution	QuantityValue (voidable)
	piezometricHead	QuantityValue (voidable)	
	hydroGeochemicalRockType	HydroGeochemicalRockTerm (codeList, voidable)
	litology	LithologyTerm _Core (codeList, voidable)
	numericAgeDate	NumericAgeRange _Core (class, voidable)
HG_ConeOfDepression (subtype of HydrogeologicalZone)	N/A	N/A	-- Definition -- (from GWML) A cone of depression occurs in an aquifer when ground water is pumped from a well. In an unconfined (water table) aquifer, this is an actual depression of the water levels. In confined (artesian) aquifers, the cone of depression is a reduction in the pressure head surrounding the pumped well (please see earlier articles for discussion of head). http://en.wikipedia.org/wiki/Cone_of_depression A depression in the groundwater table or potentiometric surface that has the shape of an inverted cone and develops around a well from which water is being withdrawn. Its trace (perimeter) on the land surface defines the zone of influence of a well. Also called pumping cone and cone of drawdown. (http://www.wrds.uwyo.edu/wrds/deq/whp/whpgloss.html) he zone around a well in an unconfined aquifer that is normally saturated, but becomes unsaturated as a well is pumped, leaving an area where the water table dips down to form a cone shape. The shape of the cone is influenced by porosity and the water yield or pumping rate of the well. The land surface overlying the cone of depression is referred to as the area of influence. http://www.groundwater.org/gi/gwglossary.html#C
	centeredAt	GM_Point	The planimetric localization of the center of the cone of depression. The planimetric shape of a cone of depression os not necessarily circular. This discussion details size and shape characteristic of a cone of depression. The size and shape (slope) of the cone of depression depends on many factors. The pumping rate in the well will affect the size of the cone. Also, the type of aquifer material, such as whether the aquifer is gravel, sand, silt, fractured rocks, karst, etc., also will affect how far the cone extends. The amount of water in storage and the thickness of the aquifer also will determine the size and shape of the cone of depression. As a well is pumped, the cone of depression will extend out and will continue to expand in a radial fashion until a point of equilibrium occurs. This usually is when the amount of water released from storage equals the rate of pumping. This also can occur when recharge to the aquifer equals the amount of water being pumped. We typically think of a cone of depression as being a circular feature surrounding the pumped well. However, aquifer characteristics can affect the shape of the cone of depression. For example, if there is a steep ground-water gradient in the area of pumpage, the cone will tend to be shorter in the upgradient direction and elongated in the downgradient direction. This is because the water is already flowing towards the well from the upgradient direction, so the cone of depression doesn't need to extend as far out to obtain water, whereas the water is flowing away from the well in the downgradient direction, so the cone of depression needs to reach further to obtain water. http://en.wikipedia.org/wiki/Cone_of_depression
	depth	QuantityValue	The depth of a cone of depression in an aquifer.
HG_InfluenceZone (subtype of HydrogeologicalZone)	N/A	N/A
	typeOfInfluence	TypeOfInfluence (codeList)	-- Definition -- (from GWML1) An area that defines a protection zone around a well.
HG_ProtectionZone (subtype of HydrogeologicalZone)	N/A	N/A
	typeOfProtection	HG_TypeOfProtection (codeList)	-- Definition -- Types of protected areas around the groundwater intake (WFD_register, MS_direct,MS_ indirect).
HydrogeologicalZone (abstract)	N/A	N/A	-- Definition -- Abstraction of Aquifer, Aquitard, Aquiclude and AquiferSystem. -- Description -- All common attributes in those classes are specified here
	Id	Itentifier	XXX
	approximateHorizontalExtend	XXX	XXX
	name	XXX	XXX
	description	XXX	XXX
	beginLifespanVersion	XXX	XXX
	endLifespanVersion	XXX	XXX
MineralGroundWaterBody (subtype of GroundWaterBody)	N/A	N/A
	mineralWaterDescription	MineralWaterDescription (codeList)
MineralSpring (subtype of HydrogeologicalObjectNatural)	N/A	N/A
	quantityOfMeanDischarge	QuantityValue (voidable)
	springUsage	SpringUsageCode (codeList, voidable)
	mineralWaterDescription	MineralWaterDescription (dataType, voidable)
MineralWaterAbstractionWell (subtype of ActiveWell)	N/A	N/A	A WaterWell used for the of abstraction of mineral water from a mineral groundwater body
	*quantityOfMeanDischarge*	QuantityValue (voidable)
	mineralWaterDescription	MineralWaterDescription (dataType, voidable)
ThermalGroundWaterBody (subtype of GroundwaterBody)	N/A	N/A
	temperature	QuantityValue (voidable)
ThermalSpring (subtype of HydrogeologicalObjectNatural)	N/A	N/A	-- Definition -- Point of mineral water discharge.
	quantityOfMeanDischarge	QuantityValue (voidable)
	temperature	QuantityValue (voidable)
	springUsage	SpringUsageCode (codeList, voidable)
ThermalWaterAbstractionWell (subtype of ActiveWell)	N/A	N/A	-- Definition -- A WaterWell used for the of abstraction of mineral water from a mineral groundwater body
	quantityOfMeanDischarge	QuantityValue (voidable)
	*temperature*	QuantityValue (voidable)
	thermalWaterPurpose	ThermalWaterPurpose (codeList)
HG_WellTimeSeriesObservation (subtype of PointTimeSeriesObservation)	N/A	N/A
	observationProperty	HG_ObservableProperty (codeList)
	result	QuantityValue
	phenomenonTypeValue	PhenomenonTypeValue (codeList)

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-- JanuszMichalak - 17 Dec 2012