GMS:DRT Package: Difference between revisions
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{{MODFLOW Links}} | {{MODFLOW Links}} | ||
{{only in print|[[Image:drt.png|thumb|right|275px|Illustration of DRT package<ref name="ofr00-466">{{citation | |||
|last=Banta | |||
|first=Edward R. | |||
|title=MODFLOW-2000, The U.S. Geological Survey Modular Ground-Water Model-Documentation of Packages for Simulating Evapotranspiration with a Segmented Function (ETS1) and Drains with Return Flow (DRT1). Open-File Report 00-466. | |||
|place=Denver, Colorado | |||
|year=2000 | |||
|url=http://water.usgs.gov/nrp/gwsoftware/modflow2000/ofr00-466.pdf | |||
}}</ref>]] | |||
}} | |||
The Drain Return (DRT) package is very similar to the regular [[GMS:DRN Package|Drain (DRN) package]]. Drains remove water from the aquifer as long as the water table is above the elevation of the drain. With the DRT package, some percentage of that removed water can be reintroduced to the aquifer at a specified grid cell. | |||
DRT boundary conditions can be added to selected cells using the '''Point Sources/Sinks''' command in the ''MODFLOW'' menu. DRT objects can also be defined using the [[GMS:MODFLOW Conceptual Model Approach|conceptual model approach]] in the [[GMS:Map Module|map module]]. | |||
{{hide in print|[[Image:drt.png|thumb|none|300px|Illustration of DRT package<ref name="ofr00-466">{{citation | |||
[[Image:drt.png|thumb|none|300px|Illustration of DRT package<ref name="ofr00-466">{{citation | |||
|last=Banta | |last=Banta | ||
|first=Edward R. | |first=Edward R. | ||
| Line 14: | Line 21: | ||
|url=http://water.usgs.gov/nrp/gwsoftware/modflow2000/ofr00-466.pdf | |url=http://water.usgs.gov/nrp/gwsoftware/modflow2000/ofr00-466.pdf | ||
}}</ref>]] | }}</ref>]] | ||
}} | |||
==Conceptual Model== | |||
Drains can be modeled using points, arcs and/or polygons in a [[GMS:MODFLOW Conceptual Model Approach|conceptual model]]. The return cell cannot be specified in the conceptual model. This is because the conceptual model is independent of the grid and, in fact, there may be no grid at all when the conceptual model is defined. When GMS performs the '''Map→MODFLOW''' command, the return cell is always set to be the highest active cell above the drain cell. This can later be changed in the ''Drain Package'' dialog. | |||
Drains can be modeled using points, arcs and/or polygons in a [[GMS:MODFLOW Conceptual Model Approach|conceptual model]]. The return cell cannot be specified in the conceptual model. This is because the conceptual model is independent of the grid and, in fact, there may be no grid at all when the conceptual model is defined. When GMS performs the Map | |||
The main DRT parameters and how they can be specified are given in the following table. | The main DRT parameters and how they can be specified are given in the following table. | ||
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Care should be taken in entering [[GMS:Conductance|conductance]] in the conceptual model so that the [[GMS:Conductance|units are correct]]. | Care should be taken in entering [[GMS:Conductance|conductance]] in the conceptual model so that the [[GMS:Conductance|units are correct]]. | ||
==Drain Return | [[File:MODFLOW-DrainReturn.jpg|thumb|300 px|The ''MODFLOW Drain Return Package'' dialog.]] | ||
The Drain Return | |||
==Drain Return Package dialog== | |||
The ''MODFLOW Drain Return Package'' dialog allows the user to edit the location and the input values associated with each drain boundary condition. Drain 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]]. | |||
The ''Use Return Flow'' toggle controls the existence of the "RETURNFLOW" optional keyword in the package input file. | The ''Use Return Flow'' toggle controls the existence of the "RETURNFLOW" optional keyword in the package input file. | ||
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[[Category:MODFLOW]] | [[Category:MODFLOW]] | ||
[[Category:MODFLOW Dialogs]] | |||
[[Category:MODFLOW Packages|DRT]] | |||
[[Category:External Links]] | |||
