Attributes for MRB_E2RF1 Catchments by Major River Basins in the Conterminous United States: Artificial Drainage (1992) and Irrigation (1997)
This tabular data set represents the estimated area of artifical drainage for the year 
1992 and irrigation types for the year 1997 compiled for every MRB_E2RF1 catchment 
of  Major River Basins (MRBs, Crawford and others, 2006). The source data sets 
were derived from tabular National Resource Inventory (NRI) data …