This post converts the selected engineering video into a quick written workflow so the user can understand the process before opening the full video. It is designed as a time-saving overview for students, engineers, and website visitors.
Step-by-step workflow
- Prepare a clean DEM with sinks treated and correct projection.
- Derive slope and flow accumulation from the DEM.
- Convert slope to a stable unit and avoid zero-slope calculation errors.
- Calculate TWI using flow accumulation and slope relationship.
- Classify the output into relative wetness zones.
- Validate wet zones using drainage, land cover, field observation, or imagery.
Best use case
TWI is useful for landslide susceptibility, drainage planning, soil moisture interpretation, road corridor screening, and preliminary hazard mapping.
Quality check
TWI is a relative terrain index, not direct groundwater depth. It must be interpreted with geology, land cover, and field evidence.
Recommended output
By the end of this workflow, the user should have a clean engineering output such as a map, terrain product, hydraulic model setup, water-level result, or project concept figure that can be used in reports and presentations.
Time-saving note
Read this page first for the workflow logic. Then open the video only for the detailed screen clicks, software interface steps, and practical demonstration.