Calculate Topographic Wetness Index (TWI) Using ArcGIS Pro

In this tutorial, uncover the hydrological secrets of landscapes by calculating the Topographic Wetness Index (TWI), a key indicator for soil moisture distribution and water accumulation areas. Using ArcGIS Pro, we’ll guide you through step-by-step processes to transform a Digital Elevation Model (DEM) into meaningful insights for hydrological and environmental applications.
What is TWI?
TWI, also known as the Compound Topographic Index (CTI), models how water flows and accumulates over terrain by integrating two critical topographic features:
• Flow Accumulation: Measures the upslope area contributing water to a point.
• Slope: Determines the terrain's steepness, with steep slopes shedding water and flat areas retaining it.
Through a logarithmic formula, TWI helps normalize these factors, providing a continuous range of values to highlight wet and dry zones.
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