What is an HydroGeoUnit according to GroundWaterML2?

From GroundwaterML2:

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).

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

gwml2:HydroGeotUnit is identified to realize the geotech concept called HydrogeoUnit.

Proposed adjustments for geotech

We recommend the addition of those optional properties: