Attributes for NHDPlus Catchments (Version 1.1) in the Conterminous United States: Artificial Drainage (1992) and Irrigation Types (1997)
This tabular dataset represents the estimated area of artificial drainage for the year 1992 
and irrigation types for the year 1997 compiled for every catchment of NHDPlus for the 
conterminous United States. The source datasets were derived from tabular National 
Resource Inventory (NRI) datasets created by the …