Gravity
This global feature is automatically added when the Include gravity checkbox is selected at the interface level in the Gravity Effects section. It defines the gravity forces from the Acceleration of gravity value, g, for the computation of the liquid water velocity, vl
Coordinate System Selection
The Global coordinate system is selected by default. The Coordinate system list contains any additional coordinate systems that the model includes. It can be used when prescribing the direction of the gravitational forces.
Acceleration of Gravity
The default value is g_const which is the physical constant having 9.8066 m/s2.