TauDEM (Terrain Analysis Using Digital Elevation Models) is a suite of Digital Elevation Model (DEM) tools for the extraction and analysis of hydrologic information from topography as represented by a DEM. TauDEM provides the following capability: * Development of hydrologically correct (pit removed) DEMs using the flooding approach * Calculates flow paths (directions) and slopes * Calculates contributing area using single and multiple flow direction methods * Multiple methods for the delineation of stream networks including topographic form-based methods sensitive to spatially variable drainage density * Objective methods for determination of the channel network delineation threshold based on stream drops * Delineation of watersheds and subwatersheds draining to each stream segment and association between watershed and segment attributes for setting up hydrologic models * Specialized functions for terrain analysis Note TauDEM also works fine with MPICH, so if you have it installed it is not necessary to install OpenMPI.