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C Factor Tool

eRAMS C Factor Tool Summary This tool estimates C factor (runoff coefficient) based on NLCD (MRLC, 2016) landuse layer. C factor (runoff coefficient) is the essential parameter for calculating peak discharge from rainfall intensity and watershed area. Most C factor...

Overland Manning’s Roughness Coefficient

eRAMS Overland Manning’s Roughness Coefficient Tool   Summary This tool estimates Manning’s overland flow roughness coefficient (n) based on NLCD landuse layer. This tool was created in CSIP (David et al., 2015) environment. The look up table for NLCD...

Hydrologic Response Unit (HRU) delineation Tool

eRAMS Hydrologic Response Unit (HRU) Delineation Tool   Abstract eRAMS HRU delineation tool calculates HRUs as a vector format by intersecting several input layers. The essential layers are landuse, soil and slope layers. Also, user can add more input layers....

Slope Length

Summary This tool calculates the average slope length of each feature in a polygon vector layer. If a user defines the boundary, NHDPlus V2 DEM (US Environmental Protection Agency, 2015) is clipped using GDAL Utility – gdalwarp (GDAL, n.d.) and input to...

Slope

  Summary This tool calculates the average slope of each feature in a polygon layer. For the boundary defined by a polygon layer, NHDPlus version 2 DEM (US EPA, 2015) is clipped using GDAL Utility – gdalwarp (GDAL, n.d.) and input to Taudem’s...