FOR EACH SIMULATION
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0.
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[#Text]
Item 0 is optional—“#” must be in column 1. Item 0 can be repeated multiple times.
Text—is a character variable (199 characters) that starts in column 2. Any characters can be included in Text. The “#” character must be in column 1. Except for the name file, lines beginning with # are restricted to these first lines of the file. Text is printed when the file is read.
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1.
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[ PARAMETER NPWEL MXL]
This optional item must start with the word “PARAMETER”.
MXL—is the maximum number of wells that will be defined using parameters.
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2.
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MXACTW IWELCB [Option]
MXACTW—is the maximum number of wells in use during any stress period. MXACTW includes wells that are defined using parameters as well as wells that are defined without using parameters.
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IWELCB—is a flag and a unit number.
| • | If IWELCB > 0, it is the unit number to which cell-by-cell flow terms will be written when "SAVE BUDGET" or a non-zero value for ICBCFL is specified in Output Control. |
| • | If IWELCB = 0, cell-by-cell flow terms will not be written. |
| • | If IWELCB < 0, well recharge for each well will be written to the listing file when "SAVE BUDGET" or a non-zero value for ICBCFL is specified in Output Control. |
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Option—is an optional list of character values.
| • | “AUXILIARY abc” or “AUX abc”—defines an auxiliary variable, named "abc", which will be read for each well as part of Items 4 and 6. Up to five variables can be specified, each of which must be preceded by "AUXILIARY" or "AUX." These variables will not be used by the Ground-Water Flow Process, but they will be available for use by other processes. The auxiliary variable values will be read after the Q variable. |
Auxiliary parameters are used with MODPATH and the Ground-Water Transport process. In MODPATH, the variable IFACE is specified with an auxiliary parameter. In the Ground-Water Transport process, concentration is specified with an auxiliary parameter. The option COMPACT BUDGET AUXILIARY must be used in the Output Control when IFACE is used for MODPATH.
| • | “CBCALLOCATE” or “CBC”—indicates that memory should be allocated to store cell-by-cell flow for each well in order to make these flows available for use in other packages. (This option is not available in MODFLOW-2005.) |
| • | “NOPRINT”—suppresses the printing of cell lists. |
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Repeat Items 3 and 4 for each NPWEL parameter.
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3.
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[PARNAM PARTYP Parval NLST [INSTANCES NUMINST]]
If PARNAM is to be a time-varying parameter, the keyword “INSTANCES” and a value for NUMINST must be entered.
PARNAM—is the name of a parameter. This name can consist of 1 to 10 characters and is not case sensitive. That is, any combination of the same characters with different case will be equivalent. All parameter names must be unique.
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PARTYP—is the type of parameter. For the WEL Package, the only allowed parameter type is Q, which defines values of the volumetric recharge rate.
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Parval—is the parameter value. This parameter value may be overridden by a value in the Sensitivity Process input file or by a value generated by the Parameter-Estimation Process.
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NLST—is the number of wells that are included in a non-time-varying parameter or in each instance of a time-varying parameter.
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INSTANCES – is an optional keyword that designates a parameter as time varying. The keyword is case-insensitive; that is, it may be entered in any combination of upper- and lower-case letters. If INSTANCES is present, it must be followed by a value for NUMINST. If INSTANCES is absent, PARNAM is non-time-varying and NUMINST should not be present.
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NUMINST – is the number of instances that are included in the definition of a time-varying parameter, where each instance is a list of wells and associated properties. If the keyword INSTANCES is present, NUMINST must be present and must be at least 1. If the keyword INSTANCES is absent, NUMINST should not be present.
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4a.
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INSTNAM
Item 4a is read only if PARNAM is time-varying. NUMINST repetitions of Item 4 (parts a and b) are read. After each repetition of Item 4a, NLST repetitions of Item 4b are read.
INSTNAM – is the name of an instance associated with the parameter PARNAM specified in the corresponding Item 3. The name can consist of 1 to 10 characters and is not case sensitive. That is, any combination of the same characters with different case will be equivalent. Names entered for INSTNAM must be unique for any given parameter, but names may be reused for instances associated with different parameters.
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4b.
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Layer Row Column Qfact [xyz]
NLST repetitions of Item 4b are required; they are read by module ULSTRD. (SFAC of the ULSTRD utility module applies to Qfact). The NLST repetitions of Item 4b follow each repetition of Item 4a when PARNAM is time-varying.
Layer—is the layer number of the model cell that contains the well.
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Row—is the row number of the model cell that contains the well.
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Column—is the column number of the model cell that contains the well.
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Qfact—is the factor used to calculate well recharge rate from the parameter value. The recharge rate is the product of Qfact and the parameter value.
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[xyz]—represents any auxiliary variables for a well that have been defined in Item 2. The auxiliary variables must be present in each repetition of Items 4 and 6 if they are defined in Item 2.
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FOR EACH STRESS PERIOD
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5.
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ITMP NP
ITMP—is a flag and a counter.
| • | If ITMP < 0, non-parameter well data from the last stress period will be reused. |
| • | If ITMP ≥ 0, ITMP will be the number of non-parameter wells read for the current stress period. |
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NP—is the number of parameters in use in the current stress period.
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6.
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Layer Row Column Q [xyz]
ITMP repetitions of Item 6 are read by module ULSTRD if ITMP > 0. (SFAC of the ULSTRD utility module applies to Q.) Item 6 is not read if ITMP is negative or zero.
Layer—is the layer number of the model cell that contains the well.
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Row—is the row number of the model cell that contains the well.
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Column—is the column number of the model cell that contains the well.
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Q—is the volumetric recharge rate. A positive value indicates recharge and a negative value indicates discharge (pumping).
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[xyz]—represents any auxiliary variables for a well that have been defined in Item 2. The auxiliary variables must be present in each repetition of Items 4 and 6 if they are defined in Item 2.
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7.
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[Pname [Iname]]
Item 7 is repeated NP times. It is not read if NP is negative or 0. Iname is read if Pname is a time-varying parameter.
Pname—is the name of a parameter that is being used in the current stress period. NP parameter names will be read.
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Iname – is an instance name that is read only if Pname is a time-varying parameter. Multiple instances of the same time-varying parameter are not allowed in a stress period.
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