GMS:DRT Package: Difference between revisions
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The Drain Return Package (DRT) is very similar to the regular [[GMS:DRN Package|Drain Package (DRN)]]. 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. | The Drain Return Package (DRT) is very similar to the regular [[GMS:DRN Package|Drain Package (DRN)]]. 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]]. | 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 | {{hide in print|[[Image:drt.png|thumb|none|300px|Illustration of DRT package<ref name="ofr00-466">{{citation | ||
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==Conceptual model== | ==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->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. | ||
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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==Drain Return package dialog== | ==Drain Return package dialog== | ||
The 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 ''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. | ||
==Notes== | ==Notes== |