EFDC_Explorer provides the ability to be able to define water quality boundary conditions with load concentrations rather than mass loading files. The tab that allows the user to can select from various options for Water Quality Point Source Loading Option is shown in Figure 1 .
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EFDC_Explorer previously only used the larger mass loading files. The new Load Concentrations option provides the user with smaller files and greater control. When the user selects an option different from that previously selected, EFDC_Explorer informs the user of the current BC and asks whether they want to switch to the new option. If the user responds affirmatively then EFDC_Explorer will convert and save out the option selected.
User Users can either overwrite or append a new water quality time series by clicking on Import & Convert WQPSLC.INP (Override) & or Import & Convert WQPSLC.INP (Append) buttons, which is a load WQ Point Source concentration file, with a concentration in kg per day. The WQ BC load concentrations rely on two new input files: WQPSLC.INP and WQPSL.INP. Note that WQPSL.INP is an EFDC_Explorer file and is not used by EFDC. It is often a very large file.
When the user returns to edit the water quality tables and series in the External Forcing Data tabtab, EFDC_Explorer displays all 21 WQ parameters. In the MASS Loadings option these parameters are depth-averaged and not layered, and so are vertically constant. However, after converting to concentrations loadings, the user is informed that the values have been converted, and now are now stored layer by layer. Initially, these values will be an average as calculated by EFDC_Explorer, but the user can now specify certain layers and assign new values as required.