The Hydraflow Express Extension is typically with AutoCAD Civil 3D. If it is missing, you can acquire it through these methods: Useres Guide - Autodesk
: Evaluating street flow spread and inlet capture efficiency The Hydraflow Express Extension is typically with AutoCAD
: If the extension was opted-out during initial setup, you can add it by going to Windows Control Panel > Add or Remove Programs . Select your Civil 3D installation, choose Change/Modify , and check the box for Hydraflow Extensions to install them. Key Capabilities of the Extension Key Capabilities of the Extension : Solves for
: Solves for open channel flow, detention ponds, street gutter flow, and drainage swales. : Generation of rating curves and formal printed
However, “extra quality” downloads come from verified legacy sources. Here are the three tiers of legitimacy:
Would you like help locating official Autodesk documentation on migrating Hydraflow projects to a newer Civil 3D version?
: Generation of rating curves and formal printed reports suitable for agency submittals. Hydraflow Express Extension for AutoCAD Civil 3D 2009