The attributes of a SPRING groundwater model are described in the chapter "Description of the data types". At least the following data is required to start a flow calculation:

• Hydraulic conductivity values for all elements: KWER identifier [e.g. 0.0001 m/s]

• Thicknesses for all elements: Identifier MAEC [e.g. 10 m] or another form of thickness assignment]

• Potential head boundary condition for at least 2 nodes (potential gradient): POTE identifier [e.g. 5-1 meters above reference datum]

Direct assignment of existing structure data