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Define Zone Budget Zones


ZoneBudget is a USGS program for computing subregional water budgets for MODFLOW ground-water flow models. Within Visual MODFLOW Flex, you can create new zones for supported flow engines in the numerical model workflows. If you imported a Visual MODFLOW Classic model, you can also view the zone budget zones that were defined in this numerical model.

At the Define Zone Budget Zones step, you can create new zone budget zones by digitizing new zones using Assign Polyline, Polygon, or Point (Single Cell), or by using 2D/3D point, polyline, or polygon shape objects from the Data tree.


Follow the steps below to create new zone budget zones:



You can assign a set of cells to a specific Zone Budget Zone using the following tools:


Use the left mouse button to start digitizing a polyline over the desired cells. Once you have finished digitizing, click on the Finish button from the toolbox, or right click with the mouse and select "Define Attributes". The following window will appear



Click the New button to assign the selected cells to a New zone; otherwise, you can select to assign cells to an existing zone by selecting the zone from the dropdown list at the top.  The selected cells can be assigned to the current layer or multiple layers using the check boxes at the bottom of the window. Once you are finished, click OK.



Digitize one or more polygons, and repeat the steps as described above for Polylines.



Left-click on one or more cells and a point will appear. Once finished, right-click and select "Define Attributes", and  follow the steps as described above for Polylines.


Using Data Object....

The following window will appear.



Choose the desired point, polyline, or polygon data object from the tree.

Click on the button (under Select Data Object)

A second window will appear:



Select which zone you want the features to apply to.  You have the option to assign the zones to:

oAn existing zone

oA new single zone

oCreate zones for individual features

oCreate zones based on feature attributes

Select the desired model layers where the zone should be applied


A simple example for a polygon data object (red) is shown below:


After the zones are generated, they will appear in layer view:


When the selected shape contains multiple polyline or polygon features, then a new zone will be created for each feature. You can also use an attribute field to select if polygons represent a specify zone. If the attribute field is an integer field, then you can also assign the zones based on the integer values in that field.



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