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The boundary condition time series available in EFDC are displayed in the Number of Input Tables and Series frame (see Figure 1). The number of currently defined tables and series are displayed alongside the button labeled "E". A time series boundary condition editor is displayed if the user clicks the "E" button. Jet type boundary condition uses a flow series. Once the user has created a Jet type boundary conditions from ViewPlan | Boundary Conditions, the GUI is accessed from the Edit/Review button in Boundary Group Utilities .

Edit/Review Boundary Conditions

The Edit/Review button provides access to the general Boundary Conditions Definitions/Groups group form shown in Figure 2. This form provides a listing of all the defined boundary groups by group ID. The list of boundary groups can be sorted by ID or listed in the order they are defined in the EFDC.INP file. In the top frame, Number of Boundary Groups, the number of the currently defined boundary groups, by type, are displayed. For details on how boundary groups work see Section 5.3.4.

A method to quickly define one or more boundary groups (where boundary condition details are to be added later) is available using the Batch Define button. This approach uses a P2D file with one or more polylines/polygons in a single file. If a polyline is open (i.e. the 1^st and last point are not the same) EFDC_Explorer will select all of the cells the line intersects as one group. If the polyline is closed (i.e. the 1^st and last point are the same) EFDC_Explorer will select all of the cells whose centroids are inside the polygon as one group.
As the user selects a boundary group from the list, summary information about the boundary group and its linkages to various boundary forcings is displayed. To edit a boundary group the user can double click on the group ID or press the Edit button. RMC'ing on a group ID pops up a menu that allows the user to Insert (add a new boundary group), Delete (delete the currently selected group) or View (plot the time series of the primary forcing).

When using the time series plotting function from this tool, the model simulation start and end times define the minimum and maximum date range. If the time series is longer, the entire time series can be viewed from the Time Series editor.

The Momentum Corrector for BC Cells Located on the Model Edge is used to set the appropriate model response for the EFDC_DSI or EFDC_GVC models. It should be 0 for the former and 1 for the latter, but may set to some number between 0 and 1.

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Import HSPF Data

The Import HSPF button provides access to the import function for the Hydrologic Simulation Program in Fortran (HSPF) (Bicknell et al., 2001). This is a hydrologic watershed modeling tool that is commonly used to predict flows and some water quality parameters. If this tool is used to predict the flows in a basin/watershed in which the EFDC model is being applied, then these results can be imported as boundary conditions for EFDC.

In addition to HSPF results, the Import HSPF tool can import any time series data whose flow and or water quality parameters are contained in columns (i.e. Excel^TM type csv or tab delimited data). The dates can be Julian or Gregorian calendar dates. If Julian dates, the Base Date used for the imported time series should be the same as that used in the EFDC project.

The import tool, shown in Figure 3, works by linking the time series/HSPF files to specific boundary groups. The only groups that can have HSPF data linked to them are flow boundaries. Each group can have its own HSPF file and import options. Flow, temperature, solids and water quality are optionally selected in the Import Parameters Frame.

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• Select whether to import that parameter for the current group using the Import check box. To activate all the groups for the current parameter, press Ctrl-A.
• Set the column which contains the data. Column 1 is the 1^st column after the column offset.
• Define a conversion factor to convert whatever units are in the file to the appropriate units for EFDC (i.e. m³/s for flow, °C for temperature and mg/l for solids, mg/l for water quality and MPN/100 ml for fecal Coliform). In addition, the conversion factor can be used to split a single number into its sub-components. For example, total organic nitrogen from and HSPF run can be split into the dissolved and particular (refractory and labile) nitrogen components.
• Select which time series number to import the series into. The first time the user imports an HSPF file, the Import into Existing checkbox should not be checked. EFDC_Explorer will import the series and add a new series ID and assign it to the appropriate boundary group. However, if the HSPF results are being re-imported or updated based on new HSPF results then the user will want to import the data into an existing EFDC series. EFDC_Explorer uses the current boundary information to assign the series number to import to, but the user can change it if needed. When the Import to Existing checkbox has focus, pressing Ctrl-A will cause the all of the boundary groups to use the same option as the current group. Importing into an existing series does not overwrite the entire series, rather it inserts into the specified series between the Begin and End dates.
• The # of Cols in the Column Offset frame provides a global column offset. This may be needed if there is an "E" in column 1 (some HSPF export series use this) or some other information in columns before the date column. EFDC_Explorer uses the date/time columns as the 1^st columns from the left, after accounting for the column offset.

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• Apply to Current Group: This button processes all the parameters designated for import for the currently selected boundary group only. Only those parameters selected for import are processed.
• Apply for All Groups: This button processes all the parameters designated for import for every flow type boundary group. All the options defined for each boundary group are used.

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Check Boundary Conditions

The Check button runs a series of checks all the currently defined boundary conditions. Some of the validation checks include:

• I & J cell indexes point to active cells
• Table series are valid
• Matching head/concentration cells for open boundaries,
• Etc.

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View Loadings

The View Loadings button brings up the loadings option form shown in Figure 4. This form shows the valid model timing (based on the model start and end times) and allows the user to select a date range to process within the model dates. The parameter to view is also shown. This list varies, depending on the computational options.

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