GRAIP_Lite uses DEMs, already existing road GIS layers with surfacing type information, and a small field calibration dataset to determine 6th code subwatershed scale road sediment production and delivery. Road layers are broken into GRAIP-style segments. Production is calculated in the usual GRAIP way, and delivery is based on the flow distance from the road to the stream and the calibrated probability of delivery at that distance. GRAIP_Lite is good at narrowing a large potential project area to the smaller watersheds with the most sediment problems.
GRAIP_Lite is a GIS tool for predicting the sediment delivery from forest roads to streams using minimal field data. The required inputs are a road line and a DEM. The model is a component of ArcHydro and runs in ArcGIS 10.3 and higher.