Stormwater analysis, driven straight from your Civil 3D drawing.

Stop re-typing catchment areas, pipe runs and invert elevations into a separate model. The HydroComplete connector reads your Civil 3D pipe networks, catchments and surfaces, runs the analysis, and writes results back into the drawing — with every formula shown and a sealable PDF at the end.

Join the early-access list Try the web app first

Built by a practicing PE. Standard public-domain methods — Rational, SCS/NRCS, Manning, HEC-22. No black boxes.

The re-entry tax

Your model already lives in Civil 3D. Your analysis shouldn't start from scratch.

Today

Export, re-key, or hand-trace pipe networks into a separate hydraulics tool
Areas and Tc transcribed by hand — a transposition error away from a wrong design
Results stranded in another app; back-annotating the drawing is manual
Black-box numbers you can't defend line-by-line to a reviewer

With the connector

Catchments, pipes and surfaces read directly from the open drawing
Areas, slopes and lengths come from the model geometry — no transcription
Flows, HGL and pipe sizing written back as labels and a profile
Every step shows its equation and inputs; export a sealable PDF report

How it works

Three steps, inside the software you already use.

Select in the drawing

From the HydroComplete ribbon, pick the pipe network and catchment objects you want to analyze. Geometry and connectivity come straight from Civil 3D.

Run the engines

Rational or SCS/NRCS peak flows, time-of-concentration, IDF intensity, Manning capacity and an HEC-22 HGL pass — computed on HydroComplete's audited engines.

Annotate & report

Write flows, depths and HGL back into the drawing, draw the profile, and export a formula-transparent PDF you can put your seal on.

What it covers

The everyday hydrology & hydraulics, done in place.

Rational method SCS / NRCS curve number Time of concentration IDF / NOAA Atlas 14 Storm-sewer HGL (HEC-22) Manning capacity & partial flow Detention / routing USDA soils lookup

Why this, not the bundled tool

Built for the part SSA makes painful.

Civil 3D ships Storm and Sanitary Analysis, and it's capable. The connector isn't trying to replace a full hydraulic-modeling suite — it's for the routine sizing and reporting you do constantly, where the friction is transcription and defensibility.

	Bundled SSA workflow	HydroComplete connector
Reads geometry from the drawing	Import / re-map	Direct from objects
Shows the equation behind every number	No	Yes — line by line
Sealable PDF report with inputs & sources	Limited	Built in
State-specific IDF / soils baked in	Manual	NOAA + USDA lookups
Learning curve for a quick sizing	Steep	Ribbon → result

Civil 3D, AutoCAD, and Storm and Sanitary Analysis are trademarks of Autodesk, Inc. HydroComplete is an independent product and is not affiliated with or endorsed by Autodesk.