| Egenskap | Stereotype | Beskrivelse | Type | Multiplisitet | 
                
                    
                        | observationTime |  | -- Name --
Observation Time | DateTime | 1..1 | 
                    
                        | piezometricSurface |  | -- Name --
Piezometric Surface | HydrogeologicalSurface | 1..1 | 
        
     
    
        
                
                    
                        | Navn | Type | Lengde | Multiplisitet | 
                
                    
                        |  | DateTime |  | 1..1 | 
                    
                        |  | HydrogeologicalSurface |  | 1..1 | 
        
     
    
        
            
                
                    | Name | Type | English | Description | 
            
                
                    | observationTime | DateTime |  | Date and time of groundwater state observation. | 
                
                    | piezometricSurface | HydrogeologicalSurface |  | A surface that represents the level to which water will rise in tightly cased wells. 
-- Description --
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. |