Arcpy script "time_of_concentration.py"

This script was developed with the ArcPy site package for use in Esri's ArcMap. The following are required for input:

• the DEM .tif file of a basin
• the flow direction .tif file
• the basin polygon .shp file

Features

• acquires the mean height value (H) in m of the basin from the DEM raster file
• the maximum flow length (L) in km from the flow direction file
• the area (A) in km^2 from the basin shapefile
• computes the time of concentration (Tc) in hours for a basin using the Giandotti formula:

• After caclulating the time of concentration, it adds it as a new field in the attribute table of the basin shapefile.

Arcpy script "calculate_slope.py"

This script was developed with the ArcPy site package for use in Esri's ArcMap. It calculates slope between points of a shapefile. The following are required for input:

• a .shp points file
• a DEM raster file

Features

• extracts the elevation from the DEM to the points .shp file
• lists the points with coordinates and elevation
• calculates and writes slope in a .txt file