The BAGIS tool provides the following four major functions. Visit the Downloads page to download a copy of the user manual or the software.

1. Preparation: This function extracts the DEM to a basin folder and generates derived surfaces of the DEM, including a filled DEM, slope, aspect, hillshade, flow-direction, and flow-accumulation layers.
2. Area of Interest (AOI) Delineation: An AOI is the unit for a basin analysis. The data used in a basin analysis are stored in an AOI folder. This AOI delineation function allows NWCC water forecasters to identify a watershed pour-point location and use the location to delineate a watershed (or catchment) boundary.
3. Basin Analysis: This function generates diagrams and tables (in the form of excel spreadsheets) indicating the geographic representation of SNOTEL and snow course sites with respect to elevation and precipitation distributions. The information is used by NWCC experts to identify new SNOTEL sites that could improve the accuracy of water forecast in AOIs.
4. Map Compilation: This function produces a set of maps used in basin analysis reports.