Runoff Generation: Raster Calculation in ArcGIS

Runoff Generation Raster Calculation in ArcGIS

ASCII stands for American Standard Code for Information Interchange.

Runoff generation at a point depends on

  • Rainfall intensity or amount
  • Antecedent conditions
  • Soils and vegetation
  • Depth to water table (topography)
  • Time scale of interest

These vary spatially which suggests a spatial geographic approach to runoff estimation. Map algebra/Raster calculator is a powerful tool to calculate.

Map Algebra is a simple and powerful algebra with which you can execute all ArcGIS Spatial Analyst extension tools, operators, and functions to perform geographic analysis.


The Raster Calculator tool allows you to create and execute Map Algebra expressions in a tool. Like other geoprocessing tools, the Raster Calculator can be used in ModelBuilder, allowing the power of Map Algebra to be more easily integrated into your workflows.

Tutorial Video



Posted in GIS

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