The SCS CN table gives CN for different combinations of land use and soil group. Perform the re-classification of classesĮventually, we are going to use these land use classes and soil group type, in conjunction with runoff curve numbers (CN), to create the curve number grid. A description of some of the land classes and their associated numbers can be found here.ġ.2. These numbers represent a land use class defined according to the USGS land cover institute (LCI). The grid is added with a unique symbology assigned to cells having identical numbers as you can see below: Add Spatial Analyst extension and activate it by clicking on Customize -> Extensions…, and checking the box next to Spatial Analyst.ġ.1. Create a new empty map, and save it as cngrid.mxd (or any other name). Workflow for the Creation of CN Grid in ArcMap
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