SAWGraph's hydrology (water) ontology - an adaptation and extension of concepts from HY_Features, HyFO, and GWML2

• geo:
• http://www.opengis.net/spec/geosparql/1.0/req/core/feature-class
• http://www.opengis.net/spec/geosparql/1.1/req/core/feature-class

A discrete spatial phenomenon in a universe of discourse.

• geo:defaultGeometry ^op
• geo:hasGeometry ^op

• hyf:HY_HydroFeature ^c
• hyfo:WaterFeature ^c

• geo:
• http://www.opengis.net/spec/geosparql/1.0/req/geometry-extension/geometry-class
• http://www.opengis.net/spec/geosparql/1.1/req/geometry-extension/geometry-class

A coherent set of direct positions in space. The positions are held within a Spatial Reference System (SRS).

• geo:defaultGeometry ^op
• geo:hasGeometry ^op

• geo:
• http://www.opengis.net/spec/geosparql/1.0/req/core/spatial-object-class
• http://www.opengis.net/spec/geosparql/1.1/req/core/spatial-object-class

Anything spatial (being or having a shape, position or an extent).

• geo:Feature ^c
• geo:Geometry ^c

A body of earth material that contains / potentially contains / potentially contained sufficient saturated permeable material to yield significant quantities of water to wells and springs (after Lohman, 1972)

A body of permeable and poorly permeable material that functions regionally as a water-yielding unit; it comprises two or more permeable beds separated at least locally by confining beds that impede groundwater movement but do not greatly affect the regional hydraulic continuity of the system; includes both saturated and unsaturated parts of permeable material (after ASCE, 1987)

Denotes aquifer-related hydrogeological units: aquifer systems, aquifers, or confining beds

• gwml2:GW_HydrogeoUnit ^c
• hyfo:AquiferWaterFeature ^c

• gwml2:GW_Aquifer ^c
• gwml2:GW_AquiferSystem ^c

Any soil or rock unit or zone that by virtue of its hydraulic properties has a distinct influence on the storage or movement of groundwater (after ANS, 1980)

Site of observation related to groundwater

A shaft or hole sunk, dug or drilled into the Earth to observe, extract or inject water (after IGH1397)

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

a body of surface water, participating in a hydrographic network, that is special due to its artificial origin (man-made)

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

captures the union of catchment and hydro nexus, and the multiple realizations of the holistic catchment concept

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

Two-dimensional (areal) hydrology-specific realization of the holistic catchment

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

One-dimensional (linear) feature that is a hydrology-specific realization of the holistic catchment

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

based on the idea that there are multiple hydrology-specific perspectives of the holistic catchment concept that are used to describe a catchment as a unit of study shared across sub-domains and studies

• hyf:HY_CatchmentArea ^c
• hyf:HY_CatchmentDivide ^c
• hyf:HY_FlowPath ^c

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

a catchment which is determined by a single common downstream catchment

• nhdplusv2:FlowLineCatchment ^c
• wbd:DrainageBasin ^c

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

a body of surface water, participating in a hydrographic network, made special due to branching and its interaction with the open sea

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

realizes a catchment specifically as a path connecting the inflow and outflow of the catchment it realizes

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

a basic feature to reflect the properties that all hydrologic features have

• hyf:HY_Catchment ^c
• hyf:HY_WaterBody ^c

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

a body of surface water, participating in a hydrographic network, seen as being special due to being formed by collecting water, for example in the case of a dam

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

a body of surface water, participating in a hydrographic network, which is special due to its shallow depth and interaction with the open sea

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

a body of surface water, participating in a hydrographic network, made special due to its considerable size

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

a body of surface water, participating in a hydrographic network, which is special due to its property to permanently or temporarily flow

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

A waterbody is part of the hydrographic network and is either standing in a depression or flowing in a channel, which are parts of the channel network

• hyf:HY_HydroFeature ^c
• hyfo:SurfaceWaterFeature ^c

• hyf:HY_Canal ^c
• hyf:HY_Estuary ^c
• hyf:HY_Impoundment ^c
• hyf:HY_Lagoon ^c
• hyf:HY_Lake ^c
• hyf:HY_River ^c

• any atomic/elementary kind of HY_FlowPath within a given framework/context (for example, a single NHDFlowline instance)

• area of associated catchment may be zero (per hydrologic fabric logic model)

• can be part of at most one mainstem

• nhdplusv2:partOfFlowPath ^op
• nhdplusv2:partOfMainStem ^op
• nhdplusv2:partOfWaterBody ^op
• nhdplusv2:divergence ^dp
• nhdplusv2:hasLevelPathId ^dp
• nhdplusv2:hasSlope ^dp

The catchment polygon for a nhdplusv2:FlowLine

• nhdplusv2:containsFlowLine ^op
• wbd:containingHUC ^op

any non-atomic/non-elementary kind of HY_FlowPath comprised of a contiguous set of atomic/elementary flowpaths

• nhdplusv2:downstreamFlowPathTC ^op
• nhdplusv2:associatedCatchmentArea ^op

• nhdplusv2:downstreamFlowPathTC ^op
• nhdplusv2:partOfFlowPath ^op

• nhdplusv2:FlowLine ^c
• nhdplusv2:MainStem ^c

a named river or similar feature, represented from head to outlet (a composition of elemenatry flowpaths (flowlines) per hydrologic fabric logic model)

• wbd:contributingDrainageBasin ^op
• nhdplusv2:hasMainStemId ^dp

• nhdplusv2:partOfMainStem ^op
• wbd:primaryFlowPath ^op

The length of a flowpath

A HUC12 watershed (drainage area) from the WBD

• wbd:containingHUC ^op
• wbd:contributingDrainageBasin ^op

An aquifer water feature including water, container, and void

a hybrid physical object, such as aquifer, well, or lake, that consists partly of a rock body (a container), empty spaces therein (voids), and a water body inside the space

A complete subsurface water feature including water, container, and void (for example, aquifer, well, et al.)

• gwml2:GW_Well ^c
• hyfo:AquiferWaterFeature ^c
• hyfo:HydroRockBody ^c
• hyfo:WaterWell ^c

A complete surface water feature including water, container, and void (for example: lake, river, marsh, et al.)

A complete water feature including water, container, and void; includes surface and subsurface water features

• hyfo:SubsurfaceWaterFeature ^c
• hyfo:SurfaceWaterFeature ^c

A representation of a water feature (for example, a line or polygon)

A water well, with focus on the hole/shaft itself (see gwml2:GW_Well)

• geo:
• http://www.opengis.net/spec/geosparql/1.1/req/geometry-extension/feature-properties

The default Geometry to be used in spatial calculations. It is usually the most detailed Geometry.

• geo:
• http://www.opengis.net/spec/geosparql/1.0/req/geometry-extension/feature-properties
• http://www.opengis.net/spec/geosparql/1.1/req/geometry-extension/feature-properties

A spatial representation for a given Feature.

Relates an aquifer system part, which can be another system, aquifer or confining bed, with its aquifer system

Relates an aquifer system with its parts, which can be other systems, aquifers or confining beds

Identifies the feature hosting the site [GW_MonitoringSite], e.g., a well, spring, lake or stream

Identifies the aquifers or confining beds intersecting the well

Identifies the aquifer a well taps

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

Identifies another waterbody immediately downstream, allowing network navigation without knowing an inflow or outflow of the catchment realized by the waterbody

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

Identifies the one and only one catchment that is realized by a particular feature

• https://docs.ogc.org/is/14-111r6/14-111r6.html
• https://github.com/opengeospatial/HY_Features/tree/master/ontology

Identifies another waterbody immediately upstream, allowing network navigation without knowing an inflow or outflow of the catchment realized by the waterbody

Connects a flowline catchment with its flowline(s)

The transitive closure of the nhdplusv2:downstreamWaterBody object property

• hyf:downstreamWaterBody ^op
• nhdplusv2:downstreamFlowPathTC ^op

Identifies another flowpath immediately downstream, allowing network navigation without knowing an inflow or outflow of the catchment realized by the flowpath

• nhdplusv2:downstreamFlowPathTC ^op
• hyf:downstreamWaterBody ^op

The transitive closure of the nhdplusv2:downstreamFlowPath object property

Identifies another flowpath immediately upstream, allowing network navigation without knowing an inflow or outflow of the catchment realized by the flowpath

Connects an elementary flowpath (e.g., NHDFlowline) to any non-elementary flowpath it is a part of

Connects an elementary flowpath (e.g., NHDFlowline) to its main stem

Connects an elementary flowpath to a waterbody it lies within

Identifies the one and only one catchment area that is associated with a particular flowpath

Relates a water feature to a representation of that water feature

Relates any flowpath to its length, represented as, for example, a qudt:Quantity object

Relates a drainage basin (area) to the primary mainstem flowing through it

Relates a flowline catchment to any WBD drainage basin it lies within

Relates a mainstem to the drainage basin (area) it drains

Relates an NHDPlusV2 feature to its COMID

Indicates if a nhdplusv2:FlowLine is the main-path or a minor-path of a divergence (no triple if no divergence)

Relates an NHDPlusV2 feature to its FCODE (see also nhdplusv2:hasFTYPE)

Relates an NHDPlusV2 feature to its FTYPE (see also nhdplusv2:hasFCODE)

The level path id of a flowline is the hydrologic sequence number of the most downstream flowline feature in the level path and is used to connect flowlines to their corresponding main stem

Relates a nhdplusv2:MainStem feature to its unique identifier

Relates an NHDPlusV2 feature to its ReachCode

The numeric average slope of a flowline