Linking

The next step is to have the models of a simulation communicate with each other. This is accomplished by linking (DSS mapping) the models thru DSS and using a simulation name. From HEC-WAT, the Model Linking Editor provides an easy way to link models including observed data, and provides a mechanism where the linking will have to be done once per alternative.

  1. From the HEC-WAT main window, from the WAT Tools toolbar, click the Model Linking Editor button Model Linking Editor icon.
  2. The Model Linking Editor opens.

    Model Linking Editor



  3. From the Simulation list the user will need to select a simulation. For this example the user will be selecting the Without Project Conditions-FRA_TW (default) simulation.
  4. Now let's link the individual model alternatives that are part of the selected simulation.

Linking the HMS Model Alternative

  1. From the Model Linking Editor, from the Model to Link list select HMS-(MCA)DCL_WAT. The Model Linking Editor table will now contain all of the locations for the HEC-HMS model that need to be linked.
  2. For HEC-HMS the linking will be results from the Hydrologic Sampling alternative. The printout (RussianRiverLinking.pdf) of the linking for each of the model alternatives is located in a folder titled RussianRiver_Data.
  3. Does every row in the table have to be done? Yes, but, since all of the linking will be to the Hydrologic Sampling alternative, click Default Model to Link. The Select Default Model to Link dialog opens. 

    Select Default Model To Link Dialog



  4. From the Default Model to Link list, select HydrologicSampling-RR_Precip2. Click OK, the Select Default Model to Link dialog closes. 
  5. A Confirm Input From Model changing to window opens. Basically the window is asking the user to be sure before proceeding, click Yes. The Confirm Input From Model changing to window closes, and the Model Linking Editor now displays the linking for the HEC-HMS model. 

    Confirm Input From Model changing Window



    Model Linking Editor - Completed HMS Model Alternative Linking



  6. Once the linking is finished for the HMS model alternative, from the Model Linking Editor click , this will save the linking.
  7. That completes the linking for the HMS model alternative.

Linking the ResSim Model Alternative

  1. From the Model Linking Editor, from the Model to Link list, select ResSim-calibrate. The Model Linking Editor table will now contain all of the locations for the ResSim model alternative that needs to be linked. 
    Model Linking Editor - Completed ResSim Model Alternative Linking




  2. For ResSim the linking will be the results from the HMS model alternative. Well, this looks like it is already linked. Well, yes and no. The HEC-ResSim model was already part of another HEC-WAT study. The model was modified to include parameter sampling. So the Model Linking Editor is reading the ResSim linking and it's reporting that this HEC-ResSim model alternative is already linked to an HMS model alternative that HEC-WAT knows about and it was linked to a different HEC-WAT simulation.
  3. Does every row in the table have to be done? Yes, but, since all of the linking will be to the HMS model alternative, click Default Model to Link. The Select Default Model to Link dialog opens. From the Default Model to Link list, select HMS-(MCA)DCL_WAT. Click OK, the Select Default Model to Link dialog closes.
  4. A Confirm Input From Model changing to window opens. Basically the window is asking the user to be sure before proceeding, click Yes. The Confirm Input From Model changing to window closes, and the Model Linking Editor now displays the linking for the ResSim model alternative.

    Model Linking Editor - ResSim Model Alternative Linked



  5. Once the linking is finished for the ResSim model alternative, from the Model Linking Editor click , this will save the linking.
  6. That completes the linking for the ResSim model alternative.

Linking the RAS Model Alternative

  1. From the Model Linking Editor, from the Model to Link list, select RAS-Base. The Model Linking Editor table updates with all of the locations for the RAS model alternative. 
  2. For the RAS linking, results from the HMS and ResSim model alternatives will be used. The printout (RussianRiverLinking.pdf) of the linking for each of the model alternatives is located in a folder titled RussianRiver_Data. By default HEC-WAT attempts to link to the correct locations and should be correct. However, users can choose to complete the following steps to manually link to the results from the HMS and ResSim model alternatives.
  3. From the Model Linking Editor, click Default Model to Link. The Select Default Model to Link dialog opens. From the Default Model to Link list, select HMS-(MCA)DCL_WAT. Click OK, the Select Default Model to Link dialog closes. 
  4. A Confirm Input From Model changing to window opens. Basically the window is asking the user to be sure before proceeding, click Yes. The Confirm Input From Model changing to window closes, and the Model Linking Editor now displays the linking for the RAS model alternative.

    Model Linking Editor - Completed RAS Model Alternative Linking



  5. Note, the two locations in the RAS linking that need to be linked to the ResSim model alternative. From the Model Linking Editor table for the DryCreek DryCreek RS 74716.8 (Sonoma Outflow J) row, from the Input Model column, select ResSim-calibrate, select Lake Sonoma Outflow JCT - Flow.
  6. Repeat Step 5 for the Russian CoyoteToDC RS 527387.7 (Lake Mendocino Outflow JCT - Flow) row.
  7. Lastly, the location (Russian@181688.0) in the RAS model that has a Failure Elevation parameter does not require an input from a model and should be left blank.
  8. Once the linking is finished for the RAS model alternative, from the Model Linking Editor click Save, this will save the linking. 
  9. That completes the linking for the Without Project Conditions-FRA_TW simulation. Close the the Model Linking Editor and return to the HEC-WAT main window.