HydroGeoSphere/Nodal Flux Head Constraints

The old instructions Specified volumetric flowrate and Specified volumetric flowrate, head constrained are no longer used, as they are covered by the boundary condition type Nodal flux described below. If you want to force the nodal flux to operate within a specified hydraulic head range, you can do so using the following instruction:

Nodal flux head constraints

 * 1) bc_constraint_1, bc_constraint_2 Minimum and maximum constraining head values for positive nodal flux (i.e. inflow).
 * 2) bc_constraint_3, bc_constraint_4 Minimum and maximum constraining head values for negative nodal flux (i.e. outflow).

If the nodal flux is positive, and the head at the node is less than bc_constraint_1, then the flux will be applied until such time as the head at the node exceeds bc_constraint_2. Once the head at the node exceeds bc_constraint_2, then the flowrate will be set to zero until such time as the head at the node drops below bc_constraint_1.

If the flowrate is negative, and the head at the node is greater than bc_constraint_3, then the flowrate will be applied until such time as the head at the node drops below bc_constraint_4. Once the head at the node drops below bc_constraint_4, then the flowrate will be set to zero until such time as the head at the node exceeds bc_constraint_3.
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