It calculates hydraulics for six different inlet types, including curb, grate, and slotted inlets, adhering to standard HEC-22 methodology.

Engineers can model and design culverts with circular, box, elliptical, and arch shapes. It supports computations for hydraulic grade lines (HGL) across various flow regimes, including roadway overtopping and hydraulic jumps.

The Hydraflow Express Extension addresses a wide variety of hydraulic and hydrologic tasks using a streamlined, grid-based input system.

For modern versions, extensions can be downloaded directly from your Autodesk Account under the "Extensions" or "Plug-ins" category for your specific Civil 3D version. Integration and Workflow

The extension supports calculations for six different weir types, including rectangular, v-notch, and proportional weirs. How to Access and Install

From within Civil 3D, navigate to the Analyze tab , find the Design panel , and click Launch Express . Alternatively, you can type StartExpress at the command line.