Overland Flow Direction Information for the Upper Colorado River Basin in Maurer et al. (2002) Climate Data resolution (overland_flow_direction_UCRB_Maurer_resolution.asc)
overland_flow_direction_UCRB_Maurer_resolution.asc is an Esri ASCII grid representing overland 
flow direction in the Upper Colorado River Basin using the D8 flow-routing convention.