An important first step in managing forest roads for improved water quality and aquatic habitat is the performance of an inventory. The Geomorphic Roads Analysis and Inventory Package (GRAIP) was developed as a tool for making a comprehensive inventory and analysis of the effects of forest roads on watersheds. This manual describes the data collection and process of a GRAIP road inventory study using GRAIP v. 1.0.8 and the field data dictionary INVENT 5.0. The GRAIP model uses field data collected with a GPS and a specific data dictionary using drop-down menus that is designed to be imported into an ArcGIS model. The inventory data are used to describe the road-stream sediment delivery and hydrologic connectivity; gully, landslide, and stream crossing failure locations and risk; and the condition of the existing road drainage network. Point data are collected for each point where the road water leaves the road surface describing the stream connection, condition, and discharge location of the drainage feature. Detailed information is collected at stream crossings to allow for risk assessment of blockage by woody debris and sediment, as well as the potential for flow diversion. For the road, data are collected as a line describing the locations of flowing water, flow path vegetation, surface type, and the condition of the flow paths and road surface. Point data are also collected for each gully and landslide, as well as for photos, gates, and other features. This document describes the field process as well as each feature in the data dictionary. It also addresses frequently asked questions and specialized field processes used during data collection. The GRAIP road inventory and model work together to provide a flexible tool box to quantify the impacts of roads on watersheds and aquatic systems.
Related website: http://www.fs.fed.us/GRAIP/index.shtml