A free extension for AutoCAD Civil 3D (2016–2020 versions) that adds stormwater drainage design tools: catchment areas, time of concentration, rational method hydrology, and basic culvert/pipe sizing.
The is a powerful hydrology and hydraulics toolkit designed to provide civil engineers with fast, reliable calculators for common stormwater tasks directly within their design environment. Rather than building complex network models, this extension allows for rapid preliminary design and quality assurance checks through a simplified user interface. Key Capabilities and Features A free extension for AutoCAD Civil 3D (2016–2020
Designs and analyzes circular, rectangular, and arch-shaped culverts. time of concentration