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 sets created by 
the National Resources Conservation Service (NRCS, U.S. Department of Agriculture, 
1995, 2000).  Artificial drainage is defined as subsurface drains and ditches.  Irrigation 
types are defined as gravity and pressure.  Subsurface drains are described as conduits, 
such as corrugated plastic tubing, tile, or pipe, installed beneath the ground surface to 
collect and/or convey drainage. Surface drainage field ditches are described as graded 
ditches for collecting excess water.  Gravity irrigation source is described as irrigation 
delivered to the farm and/or field by canals or pipelines open to the atmosphere; and 
water is distributed by the force of gravity down the field by: (1) A surface irrigation 
system (border, basin, furrow, corrugation, wild flooding, etc.) or (2) Sub-surface 
irrigation pipelines or ditches. Pressure irrigation source is described as irrigation 
delivered to the farm and/or field in pump or elevation-induced pressure pipelines, 
and water is distributed across the field by: (1) Sprinkle irrigation (center pivot, 
linear move, traveling gun, side roll, hand move, big gun, or fixed set sprinklers), 
or (2) Micro irrigation (drip emitters, continuous tube bubblers, micro spray or micro 
sprinklers). NRI data do not include Federal lands and are thus excluded from this 
dataset.  The tabular data for drainage were spatially apportioned to the National 
Land Cover Dataset (NLCD, Kerie Hitt, U.S. Geological Survey, written commun., 
2005) and the tabular data for irrigation were spatially apportioned to an enhanced 
version of the National Land Cover Dataset (NLCDe, Nakagaki and others, 2007).
		
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).

Tags: artificial-drainage-and-irrigation, cali, california, catchment, cogb, conterminous-united-states, environment, geoscientificinformation, glmr, great-lakes-ohio-upper-mississippi-and-souris-red-rainy, inlandwaters, lmtg, lower-mississippi-arkansas-white-red-and-texas-gulf, major-river-basins, missouri, mori, mrb, mrb1, mrb2, mrb3, mrb4, mrb5, mrb6, mrb7, mrb8, mrb_e2rf1, mrb_e2rf1ws, nawqa, nema, new-england-and-mid-atlantic, pacific-northwest, panw, rio-grande-colorado-and-great-basin, sagt, south-atlantic-gulf-and-tennessee, sparrow, usgs-6ba1cc85-fcea-42b5-9449-33306ea556f5
Organization: Department of the Interior