The Geomorphic Road Assessment and Inventory Package (GRAIP) is a process and a set of tools for analyzing the impacts of roads on forested watersheds. GRAIP combines a road inventory with a powerful GIS analysis tool set to predict sediment production and delivery, mass wasting risk from gullies and landslides, stream diversion potential, culvert maintenance, and fish passage at stream crossings.
The road inventory protocol describes how to systematically field inventory a road system using
GPS and automated data forms. Once downloaded, these data can be immediately run through a data quality checking and correction program. Quality checked data can then be analyzed in a program implemented in ARC-GIS. The program produces maps of surface erosion, accumulated road sediment in streams, and contributing length by segment, which relates directly to slope stability and gullying risks. Other analyses relating to stream diversion potential, stream crossing failure, culvert maintenance needs, and fish passage are also provided with the program.