The CFP: Boundary Conditions or CFP: Fixed Heads pane is on the MODFLOW Features tab of the Object Properties dialog box.
This pane is only visible if the Conduit Flow Process is selected and individual conduits are simulated.
In MODFLOW-CFP, fixed heads are defined in data set 27 of the CFP input file. However, in MODFLOW-OWHM version 2, several other types of boundaries can also be defined in this same data set. These other boundary conditions are documented in appendices 7 and 8 of Boyce and others, 2020);
If one or more nodes in a conduit is a boundary node, this pane is used to specify the boundary at such nodes. Note that conduit nodes are defined in the CFP: Conduit Flow Process Pane and that an object that defines a fixed head node does not also have to define conduit nodes. If it does not define a conduit node, intersected or enclosed cells that are not conduit nodes will be ignored when creating the CFP input files.
There is a hidden data set named CfpFixedHeads that can be used display values of fixed head nodes in the Conduit Flow Process. In MODFLOW-OWHMV2, there are additional data sets that can be used to display other CFP boundary data: CfpBoundaryType, CfpCauchyConductivity, CfpCauchyHead, CfpLimitedFlowValue, CfpLimitedHead, CfpWellFlow, and DrainableStorageWidth
CFP Boundary conditions in MODFLOW-OWHM version 2
CFP Boundary conditions in MODFLOW-OWHM version 2 can be time-dependent. If the Time-dependent checkbox is checked, the Transient tab appears in which the transient data may be specified.
Several different types of boundary condition can be applied to CFP nodes in MODFLOW OWHM version 2.
Defined Head: If the Limited flow value edit box is left empty, the boundary will be a Defined (or Fixed) Head boundary. If a value is entered in the Limited flow value edit box, the boundary will be a Defined Head Limited Flow boundary
Well: Only the defined discharge needs to be specified.
Robin or Cauchy: In addition to the head at the boundary, the conductance and limited inflow must be specified.
Limited Head: Only the limited head must be specified.
