FOR EACH SIMULATION
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Data Set 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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Data Set 1
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[ PARAMETER NPRCH]
This optional item must start with the word “PARAMETER”.
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Data Set 2
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NRCHOP IRCHCB
NRCHOP—is the recharge option code. Recharge fluxes are defined in a layer variable, RECH, with one value for each vertical column. Accordingly, recharge is applied to one cell in each vertical column, and the option code determines which cell in the column is selected for recharge.
| • | 1—Recharge is only to the top grid layer. |
| • | 2—Vertical distribution of recharge is specified in layer variable IRCH. |
| • | 3—Recharge is applied to the highest active cell in each vertical column. A constant-head node intercepts recharge and prevents deeper infiltration. |
| • | When Local Grid Refinement is used, NRCHOP should not be set to 3 in the parent model unless |
| 1. | the child model extends to the base of the parent model, or |
| 2. | there is no recharge in the area of the child model |
because the recharge in the area of the child model will be applied to the first layer below the child model in addition to any recharge that is applied in the child model itself (Personal communication, Steffen Mehl and Mary Hill, 2011).
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IRCHCB—is a flag and a unit number.
| • | If IRCHCB > 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 IRCHCB ≤ 0, cell-by-cell flow terms will not be written. |
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Repeat Items 3 and 4 for each parameter to be defined (that is, NPRCH times).
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Data Set 3
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[PARNAM PARTYP Parval NCLU [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 to be defined. 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 to be defined. For the RCH Package, the only allowed parameter type is RCH, which defines values of the recharge flux.
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NCLU—is the number of clusters required to define a parameter. Each repetition of Item 4b is a cluster (variables Mltarr, Zonarr, and IZ). There is usually only one cluster used to define a RCH non-time-varying parameter or instance of a time-varying parameter; however, it is acceptable to have more than one cluster.
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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 series of NCLU clusters. 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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Data Set 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, NCLU repetitions of Item 4b are read.
INSTNAM – is the name of an instance associated with 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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Data Set 4b
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[Mltarr Zonarr IZ]
Repeat Item 4b NCLU times. Each repetition of Item 4b is called a parameter cluster. The NCLU repetitions of Item 4b follow each repetition of Item 4a when PARNAM is time-varying.
Mltarr—is the name of the multiplier array to be used to define cell values that are determined by a parameter. The name “NONE” means that there is no multiplier array, and the cell values will be set equal to Parval.
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Zonarr—is the name of the zone array to be used to define the cells that are associated with a parameter. The name “ALL” means that there is no zone array, and all cells in the layer are associated with the parameter.
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IZ—is up to 10 zone numbers (separated by spaces) that define the cells that are associated with a parameter. These values are not used if Zonarr is specified as “ALL.” Values can be positive or negative, but 0 is not allowed. The end of the line, a zero value, or a non-numeric entry terminates the list of values.
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FOR EACH STRESS PERIOD
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Data Set 5
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INRECH INIRCH
INRECH—is the RECH read flag. Its function depends on whether or not parameters are being used.
| • | If no parameters are being used (NPRCH = 0): |
| o | If INRECH ≥ 0, a layer variable of recharge fluxes, RECH, is read. |
| o | If INRECH < 0, recharge rates from the preceding stress period are used. |
| • | If parameters are being used (NPRCH > 0): |
| o | If INRECH > 0, INRECH is the number of parameters that will be used to define RECH in the current stress period. Item 7 defines the names of the parameters. |
| o | If INRECH < 0, recharge parameters from the preceding stress period are used. |
| o | INRECH = 0 is not allowed. That is, when parameters are used, at least one parameter must be specified each stress period. |
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INIRCH—is the IRCH read flag, which is read only if NRCHOP is two:
| • | If INIRCH ≥ 0, a layer variable of layer numbers (IRCH) is read. |
| • | If INIRCH < 0, the variable (IRCH) used in the preceding stress period is reused. |
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Either Item 6 or Item 7 may be read, but not both. If Item 7 is read, it is repeated INRECH times.
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Data Set 6
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[RECH(NCOL,NROW)] -- U2DREL if NPRCH = 0 and if INRECH ≥ 0
RECH—is the recharge flux (LT-1). Read only if INRECH is greater than or equal to zero and if NPRCH = 0.
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Data Set 7
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[Pname [Iname] [IRCHPF]] -- if NPRCH > 0 and if INRECH > 0
Iname is read if Pname is a time-varying parameter. If IRCHPF is specified for a non-time-varying parameter, Iname must be omitted.
Pname—is the name of a parameter that will be used to define the RECH variable in the current stress period. Read INRECH values if NPRCH > 0 and INRECH > 0.
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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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IRCHPF—is an optional format code for printing the RECH variable after it has been defined by parameters. The format codes are the same as those used in the U2DRELREL array reading utility module.
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Data Set 8
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[IRCH(NCOL,NROW)] -- U2DINT If NRCHOP=2 and if INIRCH ≥ 0
IRCH—is the layer number variable that defines the layer in each vertical column where recharge is applied. Read only if NRCHOP is two and if INIRCH is greater than or equal to zero.
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