• Open or create a simulation that spans the time window for which you want to compute local flows and for which you have the observed data needed.
  • If necessary, edit the simulation and add the local flow alternative you created and configured for use in computing the local flows. If the alternative is already in the simulation, you may need to update it to include any changes you made in the network module. To do so, right-click on the alternative in the Control Panel and select Replace From Base Directory… from the context menu
  • Compute the alternative.
  • Open the OSI and select (one of) the tab(s) you created for the local flow OSI variables.
  • Click on the data in one of the variable columns to make that variable appear in the plot. Review the flow for the junction to verify that the standard compute produced valid results for the input provided.
  • Click the Calculate All Locals button in the stack of Action Buttons. As described in Action Buttons, a special compute type will be launched in ResSim to compute the local flow for each Local Flow OSI variable defined in the OSI.

    NEW IN RESSIM 4.0 If your Alternative Editor has Compute Holdouts checked, the OSI will now issue a warning that it cannot compute locals while Compute Holdouts is turned on. The pop up will ask you if you like to turn off Compute Holdouts temporarily. You muse say Yes if you would like to calculate local flows. No will cancel the compute. ("Figure: Computing Local Flows with Holdouts On").

    UPDATED IN RESSIM 4.1 The prompt to turn off Compute Holdouts was also added for the Calculated Selected Locals option.

    Operation Support Interface showing local flows

  • Review your results carefully to be sure the local inflows were calculated correctly. It may take a few iterations before you have the network, alternative, and OSI configured correctly for your system. Between each attempt, if may be necessary to Rerun the Extract of the model data so that your computed local flows are replaced with the original input data.
  • When you are satisfied with the computed local flows, copy the data to a file in the shared folder of the watershed. Be sure to name both the files and the records carefully to identify the data and its source.