Upload a terrain grid (DEM) or model and the tool computes flow accumulation, ridges, valleys, and watershed basins. Switch to Rainfall mode to simulate a storm and see where water pools.
Terrain Analysis Lab
Runs in the browser — nothing to install.
| Input | .asc / .obj / .3dm |
| Modes | Flow · Rainfall |
| Output | Flow lines, basins |
Using it
Upload terrain
Drop a .asc, .obj, or .3dm of your site terrain.
Pick a mode
Flow Mode (drainage analysis) or Rainfall Mode (storm simulation).
Read the legend
Amber = ridges, cyan = valleys, contours and basins toggle on top.
Export to Rhino
Download the flow lines or rainfall surface as a .3dm.
Tips
- Do — Smooth your DEM lightly before uploading — noise creates spurious micro-basins.
- Avoid — Treating the simulation as a hydraulic model — it's a topographic flow tracer, not full hydraulics.
Terrain Analysis Lab
Runs in the browser — nothing to install.