GMS:Source/Sink Attributes

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MODFLOW
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Packages
Flow:BCF6, HUF, LPF, UPW
Solvers:DE4, GMG, NWT, PCG2,
SAMG, SIP, SOR
Other:BAS6, CHD1, DRN1, DRT1,

EVT1, ETS1, GHB1, HFB1,
HUF, LAK3, MNW1, MNW2,
OUT1, RCH1, RIV1, SFR2,

STR1, WEL1, UZF1
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The following are source/sink attributes:

Contents

Specified Head

See Time Variant Specified Head (CHD) package.

General Head

See General Head (GHB1) package.

Rivers

See River (RIV1) package.

Streams

See Stream (STR1) package.

Horizontal Flow Barriers

See Horizontal Flow Barriers (HFB1) package.

Drains

See Drain (DRN1) package.

Wells

See Well (WEL1) package, Multi-Node Well (MNW1) package, or Multi-Node Well (MNW2) package.

Refine Points

Refine attributes are assigned to points or nodes and are used to automatically increase the grid density around a point when the grid is constructed. Although refine attributes may be associated with any point or node, they are usually assigned in conjunction with wells.

Conductance

See the Conductance page.

Parameter Factors

Beginning with GMS version 7.0, the Well, Drain, River, General head, and Stream boundary conditions have a parameter factor field that is associated with each boundary condition. The parameter factor is used with the parameter value to compute the final value of conductance for a given boundary condition (or in the case of the well package the final Q value). The parameter factor is automatically set by GMS when doing the Map-->MODFLOW command. This value will be set to the length of the arc in the cell or the area of the polygon in the cell associated with the boundary condition; for a point feature the factor is set to 1.0.

Node Attributes

Nodes may be connected to multiple arcs of different types. Because of this, nodes may have more than one type of attribute. Nodes are limited though, to having only the same types of attributes that the attached arcs have.


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