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The Flow Assignment frame also provides the Apply Flow Files button which is allows access to quite a specialized featureoption. This feature is predominantly used in wetting and drying models and is designed to handle the case where there is flow coming into a river with a flood plain. During low flow conditions the flow will go only into the channel, whereas in high flow conditions the flow should be distributed across the flood plain. Selecting the Apply Flow Files button displays a form allowing where the user to may browse to Flow and Head files. These are a flow table for total flow and a rating curve respectively. In this way the user can import flow with the flow files to build a cell by cell variable inflow series. This is based on the initial conditions for the cell volume.
The user interface for boundary conditions has a uniquely designed editor with drop down menus for concentration table assignment to flow tables. When the user selects Flow Table as shown in Figure 1, they can use drop-down menu items to link flow tables with concentration tables. As with earlier versions of EFDC_Explorer, the concentrations specified in the Constant Concentrations frame are only used with constant flows. Specifying If specifying a constant salinity concentration of 5 ppt in the Constant Concentrations frame but with zero constant flow, even if when the boundary has flows assigned via a time series, the salinity input to the model will be zero. If using a time series for flows, the user must use a time series to assign salinity, even if they are constant. Note that the water column concentration settings, for both time series and constant, are fixed for all cells for the same group.
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Figure 1 Boundary Condition Settings condition settings – Flow Boundaryboundary.