Attributes for NHDPlus Catchments (Version 1.1) for the Conterminous United States: Average Atmospheric (Wet) Deposition of Inorganic Nitrogen, 2002

This data set represents the average atmospheric (wet) deposition, in kilograms per 
square kilometer, of inorganic nitrogen for the year 2002 compiled for every catchment 
of NHDPlus for the conterminous United States. The source data set for wet deposition 
was from the USGS's raster data set atmospheric (wet) deposition of inorganic 
nitrogen for 2002 (Gronberg, 2005).
		
The NHDPlus Version 1.1 is an integrated suite of application-ready geospatial 
datasets that incorporates many of the best features of the National Hydrography 
Dataset (NHD) and the National Elevation Dataset (NED). The NHDPlus includes 
a stream network (based on the 1:100,00-scale NHD), improved networking, 
naming, and value-added attributes (VAAs). NHDPlus also includes elevation-derived 
catchments (drainage areas) produced using a drainage enforcement technique 
first widely used in New England, and thus referred to as "the New England Method." 
This technique involves "burning in" the 1:100,000-scale NHD and when available 
building "walls" using the National Watershed Boundary Dataset (WBD). The 
resulting modified digital elevation model (HydroDEM) is used to produce hydrologic 
derivatives that agree with the NHD and WBD. Over the past two years (2007-2008), 
an interdisciplinary team from the U.S. Geological Survey (USGS), and the U.S. 
Environmental Protection Agency (USEPA), and contractors, found that this 
method produces the best quality NHD catchments using an automated process 
(USEPA, 2007). The NHDPlus dataset is organized by 18 Production Units that 
cover the conterminous United States.
		
The NHDPlus version 1.1 data are grouped by the U.S. Geologic Survey's  Major 
River Basins (MRBs, Crawford and others, 2006).  MRB1, covering the New 
England and Mid-Atlantic River basins, contains NHDPlus Production Units 1 
and 2.  MRB2, covering the South Atlantic-Gulf and Tennessee River basins, 
contains NHDPlus Production Units 3 and 6.  MRB3, covering the Great Lakes, 
Ohio, Upper Mississippi, and Souris-Red-Rainy River basins, contains NHDPlus 
Production Units 4, 5, 7 and 9.  MRB4, covering the Missouri River basins, 
contains NHDPlus Production Units 10-lower and 10-upper.  MRB5, covering the 
Lower Mississippi, Arkansas-White-Red, and Texas-Gulf River basins, contains 
NHDPlus Production Units 8, 11 and 12.  MRB6, covering the Rio Grande, 
Colorado and Great Basin River basins, contains NHDPlus Production Units 
13, 14, 15 and 16.  MRB7, covering the Pacific Northwest River basins, contains 
NHDPlus Production Unit 17.  MRB8, covering California River basins, contains 
NHDPlus Production Unit 18.

Tags: atmospheric-deposition, cali, california, catchment, cogb, conterminous-united-states, environment, geoscientificinformation, glmr, great-lakes-ohio-upper-mississippi-and-souris-red-rainy, inlandwaters, inorganic-nitrogen, lmtg, lower-mississippi-arkansas-white-red-and-texas-gulf, major-river-basin, missouri, mori, mrb, mrb1, mrb2, mrb3, mrb4, mrb5, mrb6, mrb7, mrb8, nawqa, nema, new-england-and-mid-atlantic, nhdplus, pacific-northwest, panw, rio-grande-colorado-and-great-basin, sagt, south-atlantic-gulf-and-tennessee, sparrow, usgs-d9e75531-c9ed-4b9e-bfd7-781cfce29863
Organization: Department of the Interior