NLDI Flow Tools

NLDI Flowtools is a Python package for basin delineation and flow path tracing from any point within CONUS. It can return either the full upstream drainage basin or just the portion within the local NHD catchment (i.e., splitcatchment). The flow path tracing tool follows terrain downhill until it intersects the nearest NHD stream line, returning both the traced path and the intersected stream segment (upstream, downstream, or full geometry). NLDI Flowtools uses NHDPlus V2 data and NLDI services.