Before Updating

Please take the opportunity before migrating to CWMS 3.4 to zip a copy of your watershed.

Verifying Models within CWMS 3.3.1

Prior to opening your watershed in CWMS 3.4, it is good practice to ensure that your watershed can successfully perform the following operations:

  1. Zip a copy of your watershed folder as a backup.
  2. Copy your CWMS 3.3.1 watershed to a different location on your computer and rename the parent folder of the original watershed location.
  3. Launch the CWMS 3.3.1 CAVI, select the Setup tab, open your watershed from its new location, then launch HEC-HMS. In HEC-HMS standalone, verify that each forecast alternative (used in a CAVI forecast run) successfully computes. Along the way, resolve any problems with data dependencies so that the model simulation requires only data located within its own watershed model folder.
  4. Verify that the HEC-ResSim alternatives, HEC-RAS plans, and HEC-FIA alternatives all compute successfully within their own standalone applications.
  5. Ensure that keys are defined for each model alternative.
  6. Load each forecast run in the Model Linking Editor and verify that the linking is up-to-date.   
  7. Create and run several forecasts (for a brief time period with known good data) to verify that the Extract Lists and models operate as expected, particularly for models or linking revised during the previous checks. 

Updating Models to CWMS 3.4

CWMS 3.4 includes a newer version of some of the watershed modeling applications than the versions included in CWMS 3.3.1. If you open an existing CWMS 3.3.1 watershed in the CWMS 3.4 CAVI without upgrading the models first, each modeling application will update the model files to the version included in CWMS 3.4. Before creating new forecasts in CWMS 3.4, it is recommended to make sure that each alternative successfully computes from the setup tab.