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Figure 7 Here, we turn to HEC-GeoHMS to create runoff coefficient raster map by assigning value to each raster grid cell assisted by Lookup table - overlapping the Slope layer and Union layer. The final step is to generate a raster with “Generate CN Grid” tool found under Utility tab of HEC Geo-HMS, for which we need DTM, Union layer and Lookup table. The resulting runoff coefficient map is shown in Fig. 7.