The EFDC model has long had the capability to simulate triangular cells on the boundary of the domain. However, previously the editing and display of these cells was not supported by EE. From release of EE7.2 triangular cells are allowed on the border.
In the CELL.INP file, active cells are designated as 5, and border cells as 9 and inactive cells as 0. Triangular cells are 1 or 2 on the western face and 3 or 4 on the eastern face of the grid. The user may set all border cells as triangular by select ALT-T from the ViewPlan | Viewing Options | Bottom Elevations. The user will be prompted to Convert the staggered border cells to triangular cells. Selecting "Yes" will automatically place triangular cells on corner cells. To change individual cells the user should then Enable Edit from the Viewing Options frame and RMC on a cell. Selecting Edit allows the user to alter the cell as shown in Figure 1 with options Quad or Triangular: NE.
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Figure 1 ViewPlan: Triangular Boundary Cells.
The triangular edge is also displayed with exporting /graphic images such as shapefiles and Google KML files as shown in Figure 2.
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Figure 2 Triangular Edge Cells in KML Plot.