What is a FluidBodySurface according to GroundWaterML2?

From GroundwaterML2:

A surface on a fluid body within a local or regional area, e.g., piezometric, potentiometric, water table, salt wedge, etc.

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

gwml2:FluidBodySurface is identified to realize the geotech concept called FluidBodySurface.

Proposed adjustments for geotech

Existing attributes:

Attribute	Type and Multiplicity	Definition
gwSurfaceShape	Surface	Geometry / position of the surface.
gwSurfaceType	SurfaceType	Type of fluid body surface, e.g., piezometric, potentiometric, water table, salt wedge, etc.
gwSurfaceMetadata	ObservationMetadata	Date, time, method, etc., of the observation or calculation of the surface.

Existing relations:

Relation	Source	Target	Description
Association	Entity: GW_Divide	Entity: GW_FluidBodySurface	Relates a fluid body surface to a line on e.g., a water table or piezometric surface, on either side of which the groundwater flow diverges.
	Role: gwSurfaceDivide	Role: gwDivideSurface
Association	Entity: GW_FluidBodySurface	Entity: GW_FluidBody	Relates a fluid body to a surface hosted by the body, e.g., the top of the water table.
	Role: gwBodySurface	Role: gwSurfaceBody

Additionnal attributes:

We recommend the addition of these optional properties: