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...ll tied to one parameter. Then use different instances in different stress periods in their MODFLOW model. For more information on parameter instances consult ...nce to be used in stress periods 1, 2, and 5 then your entry in the Stress Periods field should be "1 2 5".

...asic Transport Package'' includes the computational time intervals (stress periods), an array defining which cells are inactive and which cells have constant [[File:MT3D-StressPeriods.jpg|thumb|450 px|The MT3DMS ''Stress Periods'' dialog.]]

...GHB...) to bring up a spreadsheet to edit ''Use previous'' for all stress periods. ...eet to edit ''Use previous'' and multiplier of active array for all stress periods.

...or|''XY Series Editor'']] is used to assign a concentration value for each stress period. ...ighlighting a species and either selecting a constant value for all stress periods, or by defining a set of values.

...ctivity and storage values to be changed as a step function between stress periods or in a continuous manner through a transient simulation. ...and ending horizontal hydraulic conductivity (HK) property values in each stress period.

**''Periods'' – Turn on to make the ''Periods'' section visible. This section is on by default. ...to write the list of drain conductance rates to the listing file for every stress period time step in which "BUDGET PRINT" is specified in [[GMS:MF6 OC Packa

**''Periods'' – Turn on to make the ''Periods'' section visible. This section is on by default. ...o write the list of constant-head flow rates to the listing file for every stress period time step in which "BUDGET PRINT" is specified in [[GMS:MF6 OC Packa

**''PERIODS'' – Turn on to make the ''PERIODS'' section visible. ...cells. This will add the ''BOUNDNAME'' column to the spreadsheet in the ''PERIODS'' section.

...icients of simulated head for all stress terms are constant for all stress periods. ...ts of simulated head for some stress terms may change at the start of each stress period.

**''Periods'' – Turn on to make the ''Periods'' section visible. This section is on by default. ...to write the list of general head flow rates to the listing file for every stress period time step in which "BUDGET PRINT" is specified in [[GMS:MF6 OC Packa

**''PERIODS'' – Turn on to make the ''PERIODS'' section visible. ...urn on to write the list of river flow rates to the listing file for every stress period time step in which "BUDGET PRINT" is specified in [[GMS:MF6 OC Packa

...you to cycle through stress periods and view the well properties for each stress period in the spreadsheet below. MNW2 AUX fields can be added and removed

...ndamental program options such as the computational time intervals (stress periods), an array defining which cells are inactive and which cells have constant ...tion is specified, certain portions of the MODFLOW interface such as the ''Stress Period'' dialog are inactivated since they are not relevant.

**''PERIODS'' – Turn on to make the ''PERIODS'' section visible. ...Turn on to write the list of well flow rates to the listing file for every stress period time step in which "BUDGET PRINT" is specified in [[GMS:MF6 OC Packa

**''PERIODS'' – Turn on to make the ''PERIODS'' section visible. ...cells. This will add the ''BOUNDNAME'' column to the spreadsheet in the ''PERIODS'' section.

*''PeriodData'' section – Contains a spreadsheet listing periods. An [[File:Row-add.svg|12px]] '''Add Row''' button is found at the top rigt **''PERLEN'' – The length of a stress period. The default value is "1.0".

...t Control option, then they will be printed for the last time step of each stress period. ...t Control option, then they will be printed for the last time step of each stress period.

...t Control option, then they will be printed for the last time step of each stress period. ...t Control option, then they will be printed for the last time step of each stress period.

...ultiplier is a constant which can be written to the package file with each stress period array. Each value in the array is scaled by the multiplier as the ar ...option is selected for a given stress period, the values from the previous stress period are used and the spreadsheet is dimmed.

...t Control option, then they will be printed for the last time step of each stress period. ...t Control option, then they will be printed for the last time step of each stress period.