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| {{Version GMS 7.1}}
| | #REDIRECT [[GMS:MNW2 Package]] |
| {{MODFLOW Links}}
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| The Multi-Node Well (MNW) package was developed to more accurately model wells that are completed in multiple aquifers or in a single heterogeneous aquifer, partially penetrating wells, and horizontal wells that can be affected by the effects of dynamic changes in the distribution of pumping or intraborehole flow that can significantly alter groundwater flow.
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| MNW boundary conditions can be added to selected cells using the Point Sources/Sinks command in the MODFLOW menu. MNW points can also be defined using the [[GMS:MODFLOW Conceptual Model Approach|conceptual model approach]] in the [[GMS:Map Module|map module]].
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| {{hide in print|
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| [[Image:mnw.png|thumb|none|300px|Illustration of MNW package<ref name="ofr00-466">{{citation
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| |last=Halford
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| |first=Keith J.
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| |title=User Guide for the Drawdown-Limited, Multi-Node Well (MNW) Package for the U.S. Geological Survey's Modular Three-Dimensional Finite-Difference Ground-Water Flow Model, Versions MODFLOW-96 and MODFLOW-2000. Open-File Report 02-293.
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| |place=Sacramento, California
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| |year=2002
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| |url=http://pubs.usgs.gov/of/2002/ofr02293/text.pdf
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| }}</ref>]]}}
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| {{only in print|
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| [[Image:mnw.png|thumb|center|250px|Illustration of MNW package<ref name="ofr00-466">{{citation
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| |last=Halford
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| |first=Keith J.
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| |title=User Guide for the Drawdown-Limited, Multi-Node Well (MNW) Package for the U.S. Geological Survey's Modular Three-Dimensional Finite-Difference Ground-Water Flow Model, Versions MODFLOW-96 and MODFLOW-2000. Open-File Report 02-293.
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| |place=Sacramento, California
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| |year=2002
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| |url=http://pubs.usgs.gov/of/2002/ofr02293/text.pdf
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| }}</ref>]]}}
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| ==Conceptual model==
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| MNW Wells can be modeled using points in a [[GMS:MODFLOW Conceptual Model Approach|conceptual model]]. The user can specify the various MNW properties associated with points in a coverage. In addition, a multi-node MNW boundary condition (bc) can be created using the conceptual model approach. The easiest way to create a multi-node MNW bc is to define a well screen associated with the MNW point that crosses multiple layers of the MODFLOW grid. Another method for creating a multi-node MNW bc is to specify a common "Well ID" to group different points together. Thus, multiple points in the same or different coverages can be used to create multi-node MNW bcs.
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| ==Multi-Node Well package dialog==
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| The Multi-Node Well package dialog allows the user to edit the location and the input values associated with each mnw boundary condition. MNW boundary conditions cannot be created or deleted from this dialog. They can be created and deleted via the Map -> MODFLOW command, or by using the [[GMS:MODFLOW Source/Sink Dialog|MODFLOW Source/Sink Dialog]].
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| The upper section of the dialog controls global options for the package. The spreadsheet in the lower section of the dialog controls the bcs that vary with each stress period. The user is referred to the MNW documentation for a full explanation of each of the inputs to the MNW boundary conditions. In GMS we have added the Name, Active, and Well ID fields. Name is a label used to identify a boundary condition. Active is a flag used to determine if the boundary condition is used during a particular stress period. The Well ID field is used to identify multi-node wells.
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| ==Notes==
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| <references/>
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| {{Navbox GMS}}
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| [[Category:MODFLOW]]
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