Attributes for MRB_E2RF1 Catchments by Major River Basins in the Conterminous United States: Estimated Mean Annual Natural Groundwater Recharge, 2002

This tabular data set represents the mean annual natural groundwater recharge, in millimeters, compiled for every
MRB_E2RF1catchment of selected Major River Basins (MRBs, Crawford and others, 2006). The source data set is
Estimated Mean Annual Natural Ground-Water Recharge in the Conterminous United States (Wolock, 2003).

The MRB_E2RF1 catchments are based on a modified version of the U.S. Environmental Protection Agency's
(USEPA) ERF1_2 and include enhancements to support national and regional-scale surface-water quality
modeling (Nolan and others, 2002; Brakebill and others, 2011).

Data were compiled for every MRB_E2RF1 catchment for the conterminous United States covering New England
and Mid-Atlantic (MRB1), South Atlantic-Gulf and Tennessee (MRB2), the Great Lakes, Ohio, Upper Mississippi,
and Souris-Red-Rainy (MRB3), the Missouri (MRB4), the Lower Mississippi, Arkansas-White-Red, and Texas-Gulf
(MRB5), the Rio Grande, Colorado, and the Great basin (MRB6), the Pacific Northwest (MRB7) river basins, and
California (MRB8).