BLM REA NWP 2011 AE C Aquatic Ecosystem Threats Imperviousness with Natural Landcover

This geodatabse set contains the attributes and indicators associated with aquatic EI were categorized by size, landscape context, and conditionset in the Northwestern Plains Ecoregion. The data for the Aquatic EI used information from the Aquatic Threat analysis performed by the Missouri River Assesment Program (MoRAP). The MoRAP aquatic threat analysis contains information about each threat analysis attribute, indicator and metric arbitrarily quantified (1,2,3) for the 6th level Hydrological Unit (HUC12). These attributes were calculated for the entire HUC 12, the streams within the HUC 12, or the riparian corridor within the HUC 12. For this analysis MoRAP used arbitrary values were assigned good =3, fair =2 and poor = 1. When referring the to document reader should refer to the categorical values of good, fair and poor. The attributes were calculated using ArcMap Tools. HUC12s make up larger HUC10 watersheds, thus,for the Aquatic EI selected HUC12 metrics were chosen then averaged by the HUC10. Since the data was averaged equal intervals were used in classifying good, fair and poor.