Table 8. Data Sets required by MODFLOW
Active |
Specifies whether a cell is active or not. |
Always |
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Modflow_Initial_Head |
Initial head used in the model |
Always |
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Kx |
Hydraulic conductivity along rows. |
When the LPF, BCF6, or UPW package is active and no HK parameters are defined |
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Horizontal_Anisotropy |
The ratio of hydraulic conductivity along columns to hydraulic conductivity along rows, where Kx is the hydraulic conductivity along rows. Thus, the hydraulic conductivity along columns is the product of the values in Kx and Horizontal_Anisotropy. |
When the LPF or UPW package is active, no HANI parameters are defined. |
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Kz |
The vertical hydraulic conductivity. The default formula for Confining_Bed_Kz refers to Kz so that all vertical hydraulic conductivities can be set through Kz. |
When the LPF, BCF6, or UPW package is active and no VK or VANI parameters are defined and the Method of specifying vertical hydraulic conductivity is vertical hydraulic conductivity. |
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Confining_Bed_Kz |
The vertical hydraulic conductivity of a Quasi-three-dimensional confining bed. |
When the LPF, BCF6, or UPW package is active and no VKCB parameters are defined and there is at least one nonsimulated layer. |
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Vertical_Anisotropy |
The ratio of horizontal to vertical hydraulic conductivity |
When the LPF or UPW package is active and no VK or VANI parameters are defined and the Method of specifying vertical hydraulic conductivity is the ratio of horizontal to vertical hydraulic conductivity. |
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Specific_Storage |
Specific storage |
When the LPF, BCF6, or UPW package is active and the model contains at least one transient stress period. |
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Specific_Yield |
Specific yield |
When the LPF, BCF6, or UPW package is active, the model contains at least one transient stress period and there is at least one convertible layer and no specific yield parameters are defined. |
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Wet_Dry_Threshold |
The wetting threshold. It is used in the formula for WetDry. |
Never used directly. |
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Wet_Dry_Flag |
A flag to indicate which neighboring cells can cause a cell to become wet. It is used in the formula for WetDry. •If Wet_Dry_Flag > 0, any cell adjacent to the dry cell, except the cell above the dry cell, can cause the dry cell to convert to an active cell. •If Wet_Dry_Flag = 0, the dry cell can not convert to an active cell. •If Wet_Dry_Flag < 0, only the cell below the dry cell can cause the dry cell to convert to an active cell. The Wet_Dry_Flag data set is restricted to values between -1 and 1. |
Never used directly. |
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WetDry |
A combination of the wetting threshold and a flag to indicate which neighboring cells can cause a cell to become wet. |
When the LPF or BCF6 package is active, the Layer type for at least one layer is convertible, and Wetting is active. |
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Confined_Storage_Coefficient |
The confined storage coefficient is the specific storage times the layer thickness |
When the BCF6 package is active, the model has at least one transient stress period, and a Confined or a Limited convertible layer is present. |
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Transmissivity |
The transmissivity is the horizontal hydraulic conductivity times the layer thickness. |
When a Confined or a Limited convertible layer is present. |
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Vertical_Conductance |
The vertical conductance is the vertical hydraulic conductivity divided by the thickness from the center of one layer to the center of the underlying layer. See page 5-7 of the MODFLOW-2005 documentation for more details. |
Used in all but the bottom layer. |
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Reservoir_Layer |
The model layer to which the reservoir is connected. |
When the Reservoir package is used and the user chooses a Specified layer. |
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Reservoir_Elevation |
Land-surface elevation for all reservoirs |
When the Reservoir package is used. |
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Reservoir_Hydraulic_Conductivity |
Vertical hydraulic conductivity of the reservoir bed for all reservoirs |
When the Reservoir package is used. |
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Reservoir_Bed_Thickness |
Thickness of reservoir-bed sediments for all reservoirs |
When the Reservoir package is used. |
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Lake_ID |
The identification number of the lake occupying the grid cell |
When the Lake package is used. |
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Lakebed_Leakance |
The lakebed leakance that will be assigned to lake/aquifer interfaces that occur in the corresponding grid cell. Note lakebed leakance is used differently in the BCF and LPF packages. |
When the Lake package is used. |
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Land_Surface |
The elevation of the land surface. |
When either the Unsaturated-Zone Flow package or the Farm Process is used. |
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UZF_Layer |
Used to define the aerial extent of the active model in which recharge and discharge will be simulated. A value of 0 indicates recharge and discharge will not be simulated. If NUZTOP ≥ 2, the value of IUZFBND indicates the layer whose top is the land surface. If NUZTOP = 2, the value of IUZFBND indicates the layer where recharge and discharge occurs. |
When the Unsaturated-Zone Flow package is used. |
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Used to define the stream segments within the Streamflow-Routing (SFR2) Package or lake numbers in the Lake (LAK3) Package that overland runoff from excess infiltration and groundwater discharge to land surface will be added. A positive integer value identifies the stream segment and a negative integer value identifies the lake number. |
When the Unsaturated-Zone Flow package is used and discharge is routed to streams and lakes and either the Lake or Streamflow Routing package is active. |
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Maximum_Unsaturated_Vertical_K |
The saturated vertical hydraulic conductivity of the unsaturated zone (L/t). |
When the Unsaturated-Zone Flow package is used and the user chooses to specify vertical hydraulic conductivity in the unsaturated zone separately from that in the saturated zone or else neither the LPF nor UPW package is used. |
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Brooks_Corey_Epsilon |
The Brooks-Corey epsilon of the unsaturated zone. Epsilon is used in the relation of water content to hydraulic conductivity (Brooks and Corey, 1966). |
When the Unsaturated-Zone Flow package is used. |
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Saturated_Water_Content |
The saturated water content of the unsaturated zone in units of volume of water to total volume (L3/L3). |
When the Unsaturated-Zone Flow package is used. |
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Initial_Unsaturated_Water_Content |
The initial water content for each vertical column of cells in units of volume of water at start of simulation to total volume (L3/L3). |
When the Unsaturated-Zone Flow package is used and all the stress periods are transient and the user chooses to specify the initial water content in the unsaturated zone. |
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Residual_Water_Content |
The residual water content for each vertical column of cells in units of volume of water to total volume (L3L-3) |
When the Unsaturated-Zone Flow package is used and the user chooses to specify the residaul water content in the unsaturated zone. |
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UzfGage_1_and_2 |
A flag for the type of expanded listing desired in the output file. See UZF: Unsaturated-Zone Flow Package Pane |
When the Unsaturated-Zone Flow package is used. |
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UZF_Gage3 |
A flag for the type of expanded listing desired in the output file. See UZF: Unsaturated-Zone Flow Package Pane |
When the Unsaturated-Zone Flow package is used. |
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Uzf_Surficial_Hydraulic_Conductivity |
Hydraulic conductivity of the surface (LT-1). SURFK is used for calculating the rejected infiltration and/or surface leakage. |
When the Unsaturated-Zone Flow package is used and the SPECIFYSURFK option is selected |
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HUF_Reference_Surface |
the elevation of the reference surface to be used to calculate the depth |
When the HUF package is selected and one or more KDEP parameters is defined and the user chooses to use a reference surface different from the top of the model. |
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HUF_Kx |
This data set is used to display the value of the hydraulic conductivity in the X direction that would be calculated by the HUF package. |
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never used directly. |
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HUF_Ky |
This data set is used to display the value of the hydraulic conductivity in the Y direction that would be calculated by the HUF package. |
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never used directly. |
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HUF_Interlayer_Kz |
This data set is used to display the value of the hydraulic conductivity in the Z direction between cell centers that would be calculated by the HUF package. |
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never used directly. |
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HUF_SS |
This data set is used to display the value of the specific storage that would be calculated by the HUF package. |
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never used directly. |
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HUF_Average_SY |
This data set is used to display the value of the average specific yield for a cell that would be calculated by the HUF package. |
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never used directly. |
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HUF_SY |
This data set is used to display the value of the specific storage that would be calculated by the HUF package. |
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never used directly. |
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HUF_SYTP |
This data set is used to display the value of SYTP (storage coefficient for the top active cell at each row, column location) that would be calculated by the HUF package. |
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never used directly. |
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Geostatic_Stress |
geostatic stress above model layer 1 |
When the SWT package is selected. |
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Specific_Gravity_Unsaturated |
specific gravity of moist or unsaturated sediments |
When the SWT package is selected. |
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Specific_Gravity_Saturated |
specific gravity of saturated sediments |
When the SWT package is selected. |
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Initial_Preconsolidation_Stress_Offset |
The offset from initial effective stress to initial preconsolidation stress at the bottom of the model layer in units of height of a column of water |
When the SWT package is selected and the user chooses to specify the initial preconsolidation stress as an offset from the initial stress. |
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Initial_Preconsolidation_Stress |
The initial preconsolidation stress, in units of height of a column of water, at the bottom of the model layer |
When the SWT package is selected and the user chooses to specify the initial preconsolidation stress directly. |
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MODFLOW_Specified_Head |
Values in this data set are set to true automatically in any specified head cell. It can not be manually set by the user. It is used in the formula for UZF_Layer |
never used directly. |
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PipeDiameter |
This data set can not be specified directly by the user or used in formulas. |
When CFP is used and individual conduits are simulated. |
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Tortuosity |
This data set is used for visualization. It can not be specified directly by the user or used in formulas because it does not have a value defined in every cell. |
When CFP is used and individual conduits are simulated. |
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RoughnessHeight |
This data set is used for visualization. It can not be specified directly by the user or used in formulas because it does not have a value defined in every cell. |
When CFP is used and individual conduits are simulated. |
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LowerCriticalR |
This data set is used for visualization. It can not be specified directly by the user or used in formulas because it does not have a value defined in every cell. |
When CFP is used and individual conduits are simulated. |
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UpperCriticalR |
This data set is used for visualization. It can not be specified directly by the user or used in formulas because it does not have a value defined in every cell. |
When CFP is used and individual conduits are simulated. |
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PipeConductanceOrPermeabilty |
This data set is used for visualization. It can not be specified directly by the user or used in formulas because it does not have a value defined in every cell. |
When CFP is used and individual conduits are simulated. |
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CfpNodeElevation |
This data set is used for visualization. It can not be specified directly by the user or used in formulas because it does not have a value defined in every cell. |
When CFP is used and individual conduits are simulated. |
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CfpFixedHeads |
This data set is used for visualization. It can not be specified directly by the user or used in formulas because it does not have a value defined in every cell. |
When CFP is used and individual conduits are simulated. |
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Active_Surface_Elevation[i] |
The Active_Surface_Elevation[i] is the initial elevation of a ZETA surface in the SWI2 package. |
When SWI2 is used |
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EffectivePorosity |
Effective porosity |
When SWI2 is used |
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FluidSourceDensityZone |
FluidSourceDensityZone identifies the zone in the SWI2 package that is the source of sink of fluid. |
When SWI2 is used |
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SWI_Observation_Name |
Any cell with a value other than "" will be an observation cell in the SWI2 package. |
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SWR_Reach_Group_Number |
In the SWR process, multiple reaches can be part of a reach group. This data set is used for displaying reach group numbers. |
When SWR is used. |
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SWR_Reach_Length |
This data set is used for displaying the length or a reach in SWR. |
When SWR is used. |
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SWR_Reach_Number |
This data set is used for displaying the reach number for each reach in SWR. |
When SWR is used. |
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SWR_Routing_Type |
This data set is used for displaying the routing type of each reach in SWR. •IROUTETYPE = 1, Level-pool reservoir routing. •IROUTETYPE = 2, Tilted-pool reservoir routing. •IROUTETYPE = 3, Diffusive-wave approximation. |
When SWR is used. |
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Specifies the spatial distribution of soils. |
When FMP is used. |
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Cell_Type |
Specifies how cell thickness is calculated. •0: constant cell thickness •>0: calculated cell thickness •<0: constant or calculated cell thickness depending on THICKSTRT option |
icelltype |
MODFLOW 6 models |
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Specifies whether a call is active, inactive, or vertical pass through •1 = Active cells •0 = Inactive cells •-1 = Vertical pass-through cells |
DIS, DISV |
IDOMAIN |
MODFLOW 6 models |
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Convertible |
•0: confined •>0: convertible |
iconvert |
Transient MODFLOW 6 models |
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XT3D_Angle_1 |
A rotation angle of the hydraulic conductivity tensor in degrees. ANGLE1 rotates the ellipsoid about its K33 axis (within the x - y plane). |
MODFLOW 6 NPF |
angle1 |
MODFLOW 6 models |
XT3D_Angle_2 |
ANGLE2 rotates the ellipsoid about its K22 axis (out of the x - y plane). |
MODFLOW 6 NPF |
angle2 |
MODFLOW 6 models |
XT3D_Angle_3 |
ANGLE3 rotates the ellipsoid about its K11 axis. |
MODFLOW 6 NPF |
angle3 |
MODFLOW 6 models |
SFR6_ReachLength |
the reach length |
MODFLOW 6 SRF |
rlen |
MODFLOW 6 models in which the SFR package is used |
SFR6_ReachWidth |
the reach width |
MODFLOW 6 SRF |
rwid |
MODFLOW 6 models in which the SFR package is used |
SFR6_Gradient |
the stream gradient (slope) across the reach |
MODFLOW 6 SRF |
rgrd |
MODFLOW 6 models in which the SFR package is used |
SFR6_StreambedTop |
the top elevation of the reach streambed |
MODFLOW 6 SRF |
rtp |
MODFLOW 6 models in which the SFR package is used |
SFR6_StreambedThickness |
the thickness of the reach streambed |
MODFLOW 6 SRF |
rbth |
MODFLOW 6 models in which the SFR package is used |
SFR6_HydraulicConductivity |
the hydraulic conductivity of the reach streambed |
MODFLOW 6 SRF |
rhk |
MODFLOW 6 models in which the SFR package is used |
MAW_Radius |
radius for the multi-aquifer well. |
MODFLOW 6 MAW |
radius |
MODFLOW 6 models in which the MAW package is used |
MAW_Bottom |
bottom elevation of the multi-aquifer well |
MODFLOW 6 MAW |
bottom |
MODFLOW 6 models in which the MAW package is used |
MAW_Initial_Head |
starting head for the multi-aquifer well |
MODFLOW 6 MAW |
strt |
MODFLOW 6 models in which the MAW package is used |
MAW_Screen_Top |
the top elevation of the screen for the multi-aquifer well connection |
MODFLOW 6 MAW |
scrn_top |
MODFLOW 6 models in which the MAW package is used |
MAW_Screen_Bottom |
the bottom elevation of the screen for the multi-aquifer well connection |
MODFLOW 6 MAW |
scrn_bot |
MODFLOW 6 models in which the MAW package is used |
MAW_Skin_K |
the skin (filter pack) hydraulic conductivity |
MODFLOW 6 MAW |
hk_skin |
MODFLOW 6 models in which the MAW package is used |
MAW_Skin_Radius |
skin radius (filter pack radius) for the multi-aquifer well |
MODFLOW 6 MAW |
radius_skin |
MODFLOW 6 models in which the MAW package is used |
Lake_Bed_Leakance |
the bed leakance for the lake-GWF connection |
MODFLOW 6 LAK |
bedleak |
MODFLOW 6 models in which the Lake package is used |
Lake_Bed_Thickness |
Only used for display purposes |
MODFLOW 6 LAK |
|
MODFLOW 6 models in which the Lake package is used |
KLake_Bottom_Elevation |
the bottom elevation for a HORIZONTAL lake-GWF connection |
MODFLOW 6 LAK |
belev |
MODFLOW 6 models in which the Lake package is used |
KLake_Top_Elevation |
the top elevation for a HORIZONTAL lake-GWF |
MODFLOW 6 LAK |
telev |
MODFLOW 6 models in which the Lake package is used |
KLake_Connection_Length |
the distance between the connected GWF CELLID node and the lake for a HORIZONTAL, EMBEDDEDH, or EMBEDDEDV lake-GWF connection |
MODFLOW 6 LAK |
connlen |
MODFLOW 6 models in which the Lake package is used |
KLake_Connection_Width |
the connection face width for a HORIZONTAL lake-GWF connection. |
MODFLOW 6 LAK |
connwidth |
MODFLOW 6 models in which the Lake package is used |
UZF6_Brooks_Corey_Epsilon |
the epsilon exponent of the UZF cell |
MODFLOW 6 UZF |
eps |
MODFLOW 6 models in which the UZF package is used |
UZF6_Initial_Unsaturated_Water_Content |
the initial water content of the UZF cell. |
MODFLOW 6 UZF |
thti |
MODFLOW 6 models in which the UZF package is used |
UZF6_Residual_Water_Content |
the residual (irreducible) water content of the UZF cell. |
MODFLOW 6 UZF |
thtr |
MODFLOW 6 models in which the UZF package is used |
UZF6_Saturated_Water_Content |
the saturated water content of the UZF cell. |
MODFLOW 6 UZF |
thts |
MODFLOW 6 models in which the UZF package is used |
UZF6_Surface_Depression_Depth |
the surface depression depth of the UZF cell. |
MODFLOW 6 UZF |
surfdep |
MODFLOW 6 models in which the UZF package is used |
UZF6_Vertical_Saturated_K |
the vertical saturated hydraulic conductivity of the UZF cell. |
MODFLOW 6 UZF |
vks |
MODFLOW 6 models in which the UZF package is used |
