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Numbering plan areas and area codes of Texas (tan). This is a list of area codes in the U.S. state of Texas. The date of establishment of each area code is indicated in parentheses: [1] 210: San Antonio area; overlays with 726 (November 1, 1992) 214: Dallas area, overlays with 469, 972, and 945 (October 1947)
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 Texas–Gulf region, which is listed with a 2-digit hydrologic unit code (HUC) of 12, has an approximate size of 181,886 square miles (471,080 square kilometers ), and consists of 11 subregions, which ...
Each subregion includes the area drained by a river system, a reach of a river and its tributaries in that reach, a closed basin or basins, or a group of streams forming a coastal drainage area. [6] Regions receive a two-digit code. The following levels are designated by the addition of another two digits. [7]
Watershed delineation is the process of identifying the boundary of a watershed, also referred to as a catchment, drainage basin, or river basin.It is an important step in many areas of environmental science, engineering, and management, for example to study flooding, aquatic habitat, or water pollution.
Map of texas in blue showing area codes, with border codes. ... List of Texas area codes; 0–9. Area codes 210 and 726; Area codes 214, 469, 972, and 945; Area code 254;
851 reserved as a third area code for the region. 903: Texas (Tyler, Sherman, Longview, Marshall, Palestine, Jacksonville, Carthage, and Northeast Texas) November 4, 1990: prior to October 18, 1980, the area code served Tijuana, Mexico, and adjacent areas bordering the United States; split of 214; 2003: overlaid by 430; 904
The list of drainage basins by area identifies basins (also known as "catchments" or, in North American usage, "watersheds"), sorted by area, which drain to oceans, mediterranean seas, rivers, lakes and other water bodies.
Most drainage districts are administered by an internal drainage board (IDB), which are single purpose local drainage authorities, dealing with the drainage and water level management of clean water only. [1] Each drainage district has a defined area, and the IDB only has powers to deal with matters affecting that area.