There is no special import process for bringing watersheds from CWMS 3.0 or newer into CWMS 3.2.1.    Make a backup copy of the watershed, then simply open it in the new version of CWMS.   Model files and other configurations will be automatically updated.    If there is need to import a CWMS 2.1 watershed, please contact HEC for assistance. 


Importing Individual Models and Model Alternatives

Individual models and their associated model alternatives can be imported into an existing CWMS watershed, using the commands from the Import menu option (Figure 1) found in the Models menu of the Setup module.   

Figure 1 Import Menu

A model can be imported regardless of whether the model is part of CWMS watershed or exists as a stand-alone model.


To create a new watershed from scratch, complete the following steps: 

  1. Create a New Watershed as detailed in Creating a Watershed.
  2. Import a HEC-ResSim watershed as detailed in Create a HEC-ResSim Alternative.    HEC-ResSim brings a stream alignment required by the CAVI, and is best to establish first. 
  3. Import an MFP alternative as detailed in MFP Model Alternative.
  4. Import a HEC-MetVue alternative as detailed in HEC-MetVue Model Alternative.
  5. Import an HEC-HMS alternative as detailed in Create a HEC-HMS Alternative.
  6. Import a HEC-RAS alternative as detailed in Create a HEC-RAS Alternative.
  7. Import an HEC-FIA alternative as detailed in Create a HEC-FIA Alternative.
  8. Create and configure other model alternatives as desired. Model alternative creation and configuration are detailed below.
  9. Save the watershed.