Getting started

This User Manual documents a practical workflow for using the legacy HDAT desktop tool to produce hydrology, hydraulics, and BOQ outputs for highway drainage.

Prerequisites

• HDAT installed (desktop application)
• Project inputs available:
• IDF data for the project region (return periods + durations)
• catchment properties (area, flowpath length/elevations or GIS-derived metrics)
• alignment/road drainage assumptions as required

Create a new project

1. Launch HDAT.
2. Create a new project and set the output directory.
3. Save the project (legacy format .hdat01).

Set global defaults

Set (as applicable):

• Tc method (Kirpich / Bransby-Williams)
• Method threshold for Rational vs SCS
• ARF enablement and thresholds (if applicable)
• Default Manning \(n\) and material selections