“Lower Mississippi water resource region”的意思、由来-开放百科全书

The Lower Mississippi water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined drainage areas of a series of rivers.^[1]^[2]

The Lower Mississippi region, which is listed with a 2-digit hydrologic unit code (HUC) of 08, has an approximate size of {{convert|106,741|sqmi|km2|abbr=off|lk=on|sp=us}}, and consists of 9 subregions, which are listed with the 4-digit HUCs 0801 through 0809.

This region includes the drainage within the United States of: (a) the Mississippi River below its confluence with the Ohio River, excluding the Arkansas, Red, and White River basins above the points of highest backwater effect of the Mississippi River in those basins; and (b) coastal streams that ultimately discharge into the Gulf of Mexico from the Pearl River Basin boundary to the Sabine River and Sabine Lake drainage boundary. Includes parts of Arkansas, Kentucky, Louisiana, Mississippi, Missouri, and Tennessee.^[3]

List of water resource subregions

Subregion HUC^[4]

Subregion Name^[4]

Subregion Description^[3]

Subregion Location^[4]

Subregion Size^[4]

Subregion Map

0801

Lower Mississippi–Hatchie subregion

The Mississippi River Basin from the confluence of the Ohio River to and including the Horn Lake Creek Basin, but excluding the drainage west of the West-Bank Levee along the Mississippi River.

Arkansas, Kentucky, Mississippi, Missouri, and Tennessee.

0802

Lower Mississippi–St. Francis subregion

The Mississippi River Basin from the Horn Lake Creek Basin on the east bank to and including the Arkansas and White River Basins below the points of highest backwater effect of the Mississippi River; excluding all drainage east of the East-Bank Levee below the Horn Lake Creek Basin.

Arkansas, Mississippi, and Missouri.

0803

Lower Mississippi–Yazoo subregion

The Mississippi River Basin from the Arkansas River Basin to and including the Yazoo River Basin; excluding all drainage west of the West-Bank Levee below the Arkansas River Basin.

Arkansas, Louisiana, Mississippi, and Tennessee.

0804

Lower Red–Ouachita subregion

The Red River Basin below the Bayou Rigolette Basin, excluding the Boeuf and Tensas River Basins.

Arkansas and Louisiana.

0805

Boeuf–Tensas subregion

The Boeuf and Tensas River Basins.

Arkansas and Louisiana.

0806

Lower Mississippi–Big Black subregion

The Mississippi River Basin from the Yazoo River Basin to the Lower Old River drainage boundary, but excluding all the drainage west of the West-Bank Levee along the Mississippi River.

Louisiana and Mississippi.

0807

Lower Mississippi–Lake Maurepas subregion

The Mississippi River Basin from the Lower Old River drainage boundary to the Bonnet Carre Floodway, and including the Lower Grand River Basin west of the West-Bank Levee.

Louisiana and Mississippi.

0808

Louisiana Coastal subregion

The Louisiana coastal drainage, including islands and associated waters, south of the Red River Basin boundary and west of the East-Bank Levee of the Atchafalaya Basin Floodway, to the Sabine River and Sabine Lake drainage boundary.

Louisiana

0809

Lower Mississippi subregion

The Mississippi River below the Bonnet Carre Floodway, and the Coastal drainage, including islands and associated waters, from the Pearl River Basin boundary and the Mississippi-Louisiana state line to the East-Bank Levee of the Atchafalaya Basin Floodway, excluding the drainage from the north into Lake Pontchartrain, east to the Tchefuncta River drainage boundary; and excludingthe Lower Grand River Basin.

Louisiana

See also

References

1. ^{{cite web|title=Science in Your Watershed - Locate Your Watershed|url=http://water.usgs.gov/wsc/watershed_finder.html|publisher=USGS|accessdate=2016-10-12}} {{PD-notice}}
2. ^{{cite web|title=Hydrologic Unit Maps|url=http://water.usgs.gov/GIS/huc.html|publisher=USGS|accessdate=2016-10-12}} {{PD-notice}}
3. ^¹{{cite web|title=Boundary Descriptions and Names of Regions, Subregions, Accounting Units and Cataloging Units|url=https://water.usgs.gov/GIS/huc_name.html|publisher=USGS|accessdate=2016-10-12}} {{PD-notice}}
4. ^¹²³{{cite web|vauthors=McManamay RA, Bevelhimer MS, Kao SC, Yaxing W, Martinez-Gonzalez M, Samu N|title=National Hydropower Asset Assessment Environmental Attribution|url=http://nhaap.ornl.gov/content/environmental-attribution|publisher=USGS-Oak Ridge National Laboratory|accessdate=2016-10-12|publication-date=2013}} {{PD-notice}}