The StreamCat Dataset: Accumulated Attributes for NHDPlusV2 (Version 2.1) Catchments for the Conterminous United States: Agricultural Drainage
This dataset represents % of land with agricultural drainage, described in DOI: 10.1016/j.scitotenv.2020.137661,  within individual, local NHDPlusV2 catchments and upstream, contributing watersheds.