< PreviousMGMT User’s Manual Version 1/28/2019 10:38 PM available in the Menu Toolbar, or by using the zoom Map View buttons in the Button Toolbar. Zoom to smaller scales using (‘Zoom In’). Similarly, to zoom out from any viewpoint, use (‘Zoom Out’), or return to the statewide view using the (‘Full Extension’) button. Users may also zoom in and out by rolling the wheel mouse back and forth. At any scale, the user may pan about the Work Display using (‘Pan’). There are two criteria required for displaying a layer in the Work Display: 1) the group layer must be active/checked (); and (2) the layer must be checked and visible, i.e., not “greyed out” ().Note that at the statewide scale, the County layer is the only layer shown the Work Display. This is because, at the statewide scale, it is the only layer that satisfies both criteria. However, if one zooms into to a finer scale, some of the greyed out boxes, e.g., those under Rivers and Roads, automatically become active and are shown in the Work Display (see Error! Reference source not found.). Default scale-dependent visibility settings can be edited in the layer Properties menu, which can be accessed by using the RM button on any layer (see Figure 9). More details on the Layer Properties window is provided in section 2.2.3 Chemistry Concentration Data The default layer configuration in MGMT includes point shapefiles of wells with chemical sampling data. However, the default layers contain point features only for three general categories – partial chemistry, metals, and organics – rather than for a particular element or compound. To add data for a unique chemical, utilize the (‘Create chemistry concentration data’) tool from the Button toolbar. After selecting, the cursor will become a crosshair in the Work Display. The user must define the area from which chemistry concentration data will be extracted. Single-click the LM button to define the vertices of the polygon that will fine the model domain. Double-click the LM button to “close” the polygon at the final vertex location. To create a rectangle, hold the Shift key while selecting the first vertex and the vertex diagonal of the first. Once the area for extraction is defined, the Chemistry options window will appear (see Figure 11). Select a category from the top-left drop-down menu, then choose an entry from the list of available elements/compounds in the next drop-down menu. The concentration data are loaded and displayed in the table, and can be organized according to different criteria available under the ‘Statistics’ box. The concentration dataset can be filtered for a distinct time period or for a range of prescribed values. A constant depth can be assigned if the concentration data are to be used in 3D visualizations (see section 2.5.7 Delineate Wellhead Protection Area (WHPA) Because a primary purpose of particle tracking is to delineate wellhead protection areas (WHPAs) – the area contributing groundwater to a public water-supply system (PWSS) well within a 10 year time-of-travel period – a tool for direct WHPA delineation is available in MGMT. This tool may also be used for delineating groundwater source areas to lakes, wetlands, or any other features of interest. To use the WHPA delineation tool, first create a 2D model of the potentiometric surface, then execute a backward particle simulation for the location of interest. Figure 33 provides an example of particle initialization and the 10-year result of backward particle tracking. After the simulation is complete, select (‘Delineate WHPA) from the Button toolbar or from the Particle menu. This activates the WHPA Delineation options in the AO pane, which allows users to choose the method of WHPA delineation and any of their available options, set the output file destination, and execute the tool. Four methods are available for WHPA delineation: 1) ConvexHll, which fits a tight envelop around the path lines; 2) PathBuffer, which also fits an envelope around the path lines, but applies a buffer distance around the exterior path lines; 3) FillGridCells use all grid cells from the 2D model that are intersected by path lines MGMT User’s Manual Version 1/28/2019 10:38 PM to delineate the WHPA; and 4) Manual, which allows the users to freely sketch a polygon around the particle paths. The different methods are illustrated in Figure 33,Figure 34, and Figure 36. Note that using automatically creating a shapefile in the destination file location, but a prompt will also appear to save the particle pathlines. Answer ‘yes’ to this prompt to save and display the particle path lines as polylines, as was done in in Figure 33 andFigure 34. MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 33: Delineating WHPAs in the MGMT modeling environment: (top-left): initial particle positions (within a lake, around a Type II bedrock well, and along the shoreline of another lake); (top-right): final particle positions after 10 years, with path lines shown; (bottom): WHPA delineated for the Type II well using the ConvexHull method. WHPA shapefile can be added to the WHPAS group layer Particle path lines can be saved as polylines; PTKPATHLINES group layer automatically created Select method of WHPA delineation from drop-down menu; ConvexHull fits a tight envelop around the path lines Set the output file destination Execute WHPA delineation and store in file destination Particle positions and path lines after 10 years of backward particle tracking Particles placed along part of a lake shoreline Particles placed around a Type II bedrock well Particles placed within a lake MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 34: 10-year groundwater source areas delineated for the particle initializations shown in Figure 33: (top) using the PathBuffer method to delineate the groundwater source area for a lake shoreline; (bottom) using FillGridCell to delineate the groundwater source area for an entire lake. PathBuffer also fits an envelop around the path lines, but applies a buffer distance around the exterior path lines. Prescribe a buffer distance; set units by single-clicking small options box to the right of the text box ( ) FillGridCell uses all grid cells (from the 2D model) that are intersected by path lines to delineate the WHPA Apply a buffer distance to include more grid cells around the exterior path lines MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 35: Using the Manual method to delineate a groundwater source area for a lake. 2.6 Advanced Visualizations Use the polygon feature from the Sketch menu that appears to delineate the groundwater source area/WHPA. Then use the arrow tool to select the polygon, right-click, and select ‘Convert to shape file’ MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 11: Adding chemistry concentration data to an MGMT project: (top) Chemistry window that is launched after selecting an area for data extraction; (bottom) MGMT modeling environment after chemistry concentration data are added. 2.2.4 Layer Properties. Visibility may also be controlled by using the RM button on any layer and checking/unchecking ‘Visible’ in the pop-up menu. Concentration data layer will automatically be grouped under Chemical Sampling in the Layer Viewer Filter dataset for a time period or a range of values Organize the dataset or compute average/sum for sites with multiple samples MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 7: Layer Viewer, with each default group layer expanded to show default layers. MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 8: Zoom-in of Great Lansing area to illustrate the scale-dependent visibility effects of some default layers in MGMT. MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 9: Accessing scale-dependent visibility settings in Layer Properties. 2.2.2 Adding User Data and Spatial Reference Users may add their own data in the form of shapefiles (.shp) or raster (*.img; *.bmp, *.jpg; *.jpeg, *.png; *.gif; *.tif; *.tiff; *.bil; *bip; *.bsq; etc.). The user may also connect to Server Data (e.g., by connecting to an ArcGIS Server) or add Layer, Layer Package, and Layer Package Info Files. To open the Add Data window, 1) navigate to ‘Add…’ in the File menu; 2) select (‘Add Mapping Layer File), or 3) select using the RM button and choose ‘Add layer’. Then select a data category (Shapefiles, Geodatabase, etc.), browse to the file location, and select ‘Open’ to add your user data (see Figure 10). The projection used in MGMT is: Hotine_Oblique_Mercator_Azimuth_Natural_Origin. The Geographic Coordinate System used is: GCS_North_American_1983. All user data added to MGMT should utilize the correct spatial reference. Users may move layers to different parent group layers, or may create a new group layer by selecting using the RM button, then choosing ‘New layer group’. A window will appear where the user may enter the name of the new layer group. Any selected layer can be click-dragged (using the LM button) underneath any group layer, or may be displayed without belonging to a group layer. MGMT User’s Manual Version 1/28/2019 10:38 PM Figure 10: Adding user data to MGMT. 2.2.3 Chemistry Concentration Data The default layer configuration in MGMT includes point shapefiles of wells with chemical sampling data. However, the default layers contain point features only for three general categories – partial chemistry, metals, and organics – rather than for a particular element or compound. To add data for a unique chemical, utilize the (‘Create chemistry concentration data’) tool from the Button toolbar. After selecting, the cursor will become a crosshair in the Work Display. The user must define the area from which chemistry concentration data will be extracted. Single-click the LM button to define the vertices of the polygon that will fine the model domain. Double-click the LM button to “close” the polygon at the final vertex location. To create a rectangle, hold the Shift key while selecting the first vertex and the vertex diagonal of the first. Next >