FOR EACH SIMULATION
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Data Set 1
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NBDTIM NFLW NHED IFHBSS IFHBCB NFHBX1 NFHBX2
Integer
NBDTIM is the number of times at which flow and head will be specified for all selected cells.
| • | If NBDTIM = 1, specified flow and head values will remain constant for the entire simulation. |
| • | If NBDTIM > 1, specified flow and head values will be computed for each time step using linear interpolation. |
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Integer
NFLW is the number of cells at which flows will be specified.
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Integer
NHED is the number of cells at which head will be specified.
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Integer
IFHBSS is the FHB steady-state option flag. If the simulation includes any transient-state stress periods, the flag is read but not used; in this case, specified-flow, specified-head, and auxiliary-variable values will be interpolated for steady-state stress periods in the same way that values are interpolated for transient stress periods. If the simulation includes only steady-state stress periods, the flag controls how flow, head, and auxiliary-variable values will be computed for each steady-state solution.
| • | If IFHBSS = 0, values of flow, head, and auxiliary variables will be those specified for the starting time of the simulation. This results in use of the first value in arrays FLWRAT, SBHED, and AuxVar for each respective boundary cell. |
| • | If IFHBSS ≠ 0, values of flow, head, and auxiliary variables will be interpolated in the same way that values are computed for transient simulations. |
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Integer
IFHBCB is a flag and unit number.
| • | If IFHBCB > 0, it is the unit number on which cell-by-cell flow terms will be recorded whenever ICBCFL is set (see McDonald and Harbaugh, 1988, chap. 4, p. 14–15). |
| • | If IFHBCB ≤ 0, cell-by-cell flow terms will not be recorded. |
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Integer
NFHBX1 is the number of auxiliary variables whose values will be computed for each time step for each specified-flow cell.
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Integer
NFHBX2 is the number of auxiliary variables whose values will be computed for each time step for each specified-head cell.
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Data Set 2
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VarName Weight
Omit data item 2 if NFHBX1=0. Input item 2 consists of one record for each of NFHBX1 auxiliary variables.
Character
VarName is the name of an auxiliary variable. Name can include up to 16 characters with no embedded blank characters.
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Real
Weight is the time-weighting factor for an auxiliary variable specifying the fraction of each time step at which the value of the variable will be interpolated. Value must be in the range from 0.0 to 1.0.
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Data Set 3
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VarName Weight
Omit data item 3 if NFHBX2=0. Input item 3 consists of one record for each of NFHBX2 auxiliary variables.
Character
VarName is the name of an auxiliary variable. Name can include up to 16 characters with no embedded blank characters.
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Real
Weight is the time-weighting factor for an auxiliary variable specifying the fraction of each time step at which the value of the variable will be interpolated. Value must be in the range from 0.0 to 1.0.
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Data items 4a and 4b are required for all simulations. Include NBDTIM times in data item 4b.
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Data Set 4a
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IFHBUN CNSTM IFHBPT
 Explanation of variables
Integer
IFHBUN is the unit number on which data lists will be read. The same or different unit numbers can be used to read lists in data items 4b, 5b, 6b, 7b, and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
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Real
CNSTM is a constant multiplier for data list BDTIM (data item 4b), FLWRAT (part of data item 5b), SBHED(part of data item 7b), and auxiliary variables in data items 6b and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
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Integer
IFHBPT is a flag for printing values of data lists in items 4b, 5b, 6b, 7b, and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
| • | If IFHBPT > 0 data list read at the beginning of the simulation will be printed. |
| • | If IFHBCB ≤ 0 data list read at the beginning of the simulation will not be printed. |
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Data Set 4b
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Real
BDTIM is simulation time at which values of specified flow and (or) values of specified head will be read. NBDTIM values are required.
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Omit data items 5a and 5b if NFLW=0. Input item 5b consists of one set of numbers for each of NFLW cells. Each set of numbers includes layer, row, and column indices, an integer auxiliary variable, and NBDTIM values of specified flow.
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Data Set 5a
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IFHBUN CNSTM IFHBPT
Explanation of variables
Integer
IFHBUN is the unit number on which data lists will be read. The same or different unit numbers can be used to read lists in data items 4b, 5b, 6b, 7b, and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
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Real
CNSTM is a constant multiplier for data list BDTIM (data item 4b), FLWRAT (part of data item 5b), SBHED(part of data item 7b), and auxiliary variables in data items 6b and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
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Integer
IFHBPT is a flag for printing values of data lists in items 4b, 5b, 6b, 7b, and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
| • | If IFHBPT > 0 data list read at the beginning of the simulation will be printed. |
| • | If IFHBCB ≤ 0 data list read at the beginning of the simulation will not be printed. |
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Data Set 5b
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Layer Row Column IAUX FLWRAT(NBDTIM)
Integer
Layer is the layer index of specified-flow cell (data item 5b) or specified-head cell (data item 7b).
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Integer
Row is the row index of specified-flow cell (data item 5b) or specified-head cell (data item 7b).
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Integer
Column is the column index of specified-flow cell (data item 5b) or specified-head cell (data item 7b).
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Integer
IAUX Is an integer auxiliary variable associated with each specified-flow and specified-head boundary cell. A value is read but not used in simulations of groundwater flow with MODFLOW-96. IAUX can be used by programs such as MODPATH (Pollock, 1994) to store information such as the cell face associated with the specified-flow or specified-head boundary.
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Real
FLWRAT is volumetric rate of flow at specified-flow cells. A list of NBDTIM values must be specified for each of NFLW specified-flow cells.
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Omit data items 6a and 6b if NFHBX1=0 or if NFLW=0. Include one set of data items 6a and 6b for each of NFHBX1 auxiliary variables. Input item 6b consists of one set of numbers for each of NFLW cells. Each set includes NBDTIM values of the variable.
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Data Set 6a
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IFHBUN CNSTM IFHBPT
Explanation of variables
Integer
IFHBUN is the unit number on which data lists will be read. The same or different unit numbers can be used to read lists in data items 4b, 5b, 6b, 7b, and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
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Real
CNSTM is a constant multiplier for data list BDTIM (data item 4b), FLWRAT (part of data item 5b), SBHED(part of data item 7b), and auxiliary variables in data items 6b and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
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Integer
IFHBPT is a flag for printing values of data lists in items 4b, 5b, 6b, 7b, and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
| • | If IFHBPT > 0 data list read at the beginning of the simulation will be printed. |
| • | If IFHBCB ≤ 0 data list read at the beginning of the simulation will not be printed. |
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Data Set 6b
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Real
AuxVar is value of real auxiliary variable at specified-flow and specified-head cells. A list of NBDTIM values must be specified for each of NFLW specified-flow cells and for each of NHED specified-head cells.
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Omit data items 7a and 7b if NHED=0. Input item 7b consists of one set of numbers for each of NFLW cells. Each set of numbers includes layer, row, and column indices, an integer auxiliary variable, and NBDTIM values of specified head.
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Data Set 7a
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IFHBUN CNSTM IFHBPT
Explanation of variables
Integer
IFHBUN is the unit number on which data lists will be read. The same or different unit numbers can be used to read lists in data items 4b, 5b, 6b, 7b, and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
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Real
CNSTM is a constant multiplier for data list BDTIM (data item 4b), FLWRAT (part of data item 5b), SBHED(part of data item 7b), and auxiliary variables in data items 6b and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
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Integer
IFHBPT is a flag for printing values of data lists in items 4b, 5b, 6b, 7b, and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
| • | If IFHBPT > 0 data list read at the beginning of the simulation will be printed. |
| • | If IFHBCB ≤ 0 data list read at the beginning of the simulation will not be printed. |
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Data Set 7b
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Layer Row Column IAUX SBHED(NBDTIM)
Integer Integer Integer Integer Real
Integer
Layer is the layer index of specified-flow cell (data item 5b) or specified-head cell (data item 7b).
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Integer
Row is the row index of specified-flow cell (data item 5b) or specified-head cell (data item 7b).
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Integer
Column is the column index of specified-flow cell (data item 5b) or specified-head cell (data item 7b).
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Integer
IAUX Is an integer auxiliary variable associated with each specified-flow and specified-head boundary cell. A value is read but not used in simulations of groundwater flow with MODFLOW-96. IAUX can be used by programs such as MODPATH (Pollock, 1994) to store information such as the cell face associated with the specified-flow or specified-head boundary.
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SBHED is an array containing NBDTIM values of the head for each specified-head cell.
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If the UZF package is used, IUZFBND should be set to zero for all specified head cells.
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Omit data items 8a and 8b if NFHBX2=0 or if NHED=0. Include one set of data items 8a and 8b for each of NFHBX2 auxiliary variables. Input item 8b consists of one set of numbers for each of NHED cells. Each set includes NBDTIM values of the variable.
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Data Set 8a
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IFHBUN CNSTM IFHBPT
Explanation of variables
Integer
IFHBUN is the unit number on which data lists will be read. The same or different unit numbers can be used to read lists in data items 4b, 5b, 6b, 7b, and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
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Real
CNSTM is a constant multiplier for data list BDTIM (data item 4b), FLWRAT (part of data item 5b), SBHED(part of data item 7b), and auxiliary variables in data items 6b and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
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Integer
IFHBPT is a flag for printing values of data lists in items 4b, 5b, 6b, 7b, and 8b. A separate value is read for each of these data sets in data sets 4a, 5a, 6a, 7a and 8a respectively.
| • | If IFHBPT > 0 data list read at the beginning of the simulation will be printed. |
| • | If IFHBCB ≤ 0 data list read at the beginning of the simulation will not be printed. |
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Data Set 8b
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Real
AuxVar is value of real auxiliary variable at specified-flow and specified-head cells. A list of NBDTIM values must be specified for each of NFLW specified-flow cells and for each of NHED specified-head cells.
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