Extending gwml2 HydroGeoVoid

What is a HydroGeoVoid according to GroundWaterML2?

From GroundwaterML2:

Voids represent the spaces inside (hosted by) a unit or its material. E.g., the pores in an aquifer, or in the sandstone of an aquifer. Voids can contain fluid bodies. Voids are differentiated from ‘porosity’ in that porosity is the proportion of void volume to total volume, while voids are the spaces themselves. Voids are required in GWML2, for example, to capture the volume of fractures in an aquifer.

For which geotech concept do we want to use gwml2:HydroGeoVoid?

gwml2:HydroGeoVoid is identified to realize the geotech concept called Void.

The name HydroGeoVoid makes it very hydrogeology oriented, yet the definition is generic enough for the geotech purpose.

For man made voids (eg. tunnels, gallery) the concept of Facility from LandInfra may also be used.

Existing attributes

Attribute	Type and Multiplicity	Definition
gwVoidDescription	char	General description of the void
gwVoidHostMaterial	EarthMaterial [0..*]	The material that hosts the void, if specified. Note voids can be hosted by a unit (an aquifer) or its material (e.g., sandstone).
gwVoidMetadata	GW_Metadata	Metadata for the void.
gwVoidShape	Geometry	Shape and position of the void.
gwVoidType	PorosityType	Type of void e.g., fractured, intergranular, etc.
gwVoidVolume	Measurement	Volume of the void.

Proposed adjustments for geotech

We recommend the addition of these optional properties: