Dataset

U.S. Wetland Resources and Deepwater Habitats by Type: 1998 to 2004

Added By Infochimps

The Statistical Abstract files are distributed by the US Census Department as Microsoft Excel files. These files have data mixed with notes and references, multiple tables per sheet, and, worst of all, the table headers are not easily matched to their rows and columns.

A few files had extraneous characters in the title. These were corrected to be consistent. A few files have a sheet of crufty gibberish in the first slot. The sheet order was shuffled but no data were changed.

The tables that were changed (this is table 355):

0166 0257 0362 0429 0445 0446 0459 0461 0462 0464 0465 0466 0467
0469 0479 0480 0481 0482 0483 0484 0485 0486 0487 0559 0628 0629
1144 1227 1231

This dataset consists of a table of 27 rows and 5 columns.

In thousands of acres. Wetlands and deepwater habitats are defined separately because the term wetland does not included permanent water bodies. Deepwater habitats are permanently flooded land lying below the deepwater boundary of wetlands. Deepwater habitats include environments where surface water is permanent and often deep, so that water, rather than air, is the principal medium within which the dominant organisms live, whether or not they are attached to the substrate. As in wetlands, the dominant plants are hydrophytes; however, the substrates are considered nonsoil because the water is too deep to support emergent vegetation. In general terms, wetlands are lands where saturation with water is the dominant factor determining the nature of soil development and the types of plant and animal communities living in the soil and on its surface. The single feature that most wetlands share is soil or substrate that is at least periodically saturated with or covered by water. Wetlands are lands transitional between terrestrial and aquatic systems where the water table is usually at or near the surface or the land is covered by shallow water. For more information on For more information on wetlands, see the “Classification of Wetlands and Deepwater Habitats of the United States” at http://www.fws.gov/nwi/Pubs_Reports/Class_Manual/class_titlepg.htm

Footnotes

  1. The lacustrine system includes deepwater habitats with all of the following characteristics: (1)
    situated in a topographic depression or a dammed river channel; (2) lacking trees, shrubs,
    persistent emergents, emergent mosses or lichens with greater than 30 percent coverage; (3)
    total area exceeds 20 acres (8 hectares).
  2. The riverine system includes deepwater habitats contained within a channel, with the
    exception of habitats with water containing ocean derived salts in excess of 0.5 parts per
    thousand.
  3. The estuarine system consists of deepwater tidal habitats and adjacent tidal wetlands that are
    usually semi-enclosed by land but have open, partly obstructed, or sporadic access to the open
    ocean, and in which ocean water is at least occasionally diluted by freshwater runoff from the land.
    Subtidal is where the substrate is continuously submerged by marine or estuarine waters.
  4. Intertidal is where the substrate is exposed and flooded by tides. Intertidal includes the splash
    zone of coastal waters.
  5. Emergent wetlands are characterized by erect, rooted, herbaceous
    hydrophytes, excluding mosses and lichens. This vegetation is present for
    most of the growing season in most years. These wetlands are usually
    dominated by perennial plants.
  6. Forested wetlands are characterized by woody vegetation that is 20 feet tall or taller.
  7. Shrub wetlands include areas dominated by woody vegetation less than 20 feet tall.
    The species include true shrubs, young trees, and trees or shrubs that are small or
    stunted because of environmental conditions.

License

Public Domain (Government Work)

This dataset was prepared by the government and is therefore in the public domain. There are no restrictions upon its use.