If you were unable to find the download from River and Flood Analysis 2016 software when Civil 3D was first released you were probably wondering how and when you will be able to get it. This module has been released and can be found under product enhancements on the Autodesk Account site.
- Navigate to https://manage.autodesk.com
- Log in with personal credentials.
- Under the "Management" tab select "Product Enhancements" from the quick links section.
- On the product enhancements page the module can be found in this list as "Autodesk River and Flood Analysis Module".