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  2. Hydrologic unit system (United States) - Wikipedia

    en.wikipedia.org/wiki/Hydrologic_unit_system...

    The 10-digit watersheds were delineated to be between 40,000 and 250,000 acres in size, and the 12-digit subwatersheds between 10,000 and 40,000 acres. [5] In addition to the hydrologic unit codes, each hydrologic unit was assigned a name corresponding to the unit's principal hydrologic feature or to a cultural or political feature within the ...

  3. Watershed delineation - Wikipedia

    en.wikipedia.org/wiki/Watershed_delineation

    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.

  4. Watersheds of North America - Wikipedia

    en.wikipedia.org/wiki/Watersheds_of_North_America

    Watersheds of North America are large drainage basins which drain to separate oceans, seas, gulfs, or endorheic basins. There are six generally recognized hydrological continental divides which divide the continent into seven principal drainage basins spanning three oceans ( Arctic , Atlantic and Pacific ) and one endorheic basin.

  5. List of drainage basins by area - Wikipedia

    en.wikipedia.org/wiki/List_of_drainage_basins_by...

    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.

  6. File:Operational Navigation Chart H-9, 7th edition.jpg ...

    en.wikipedia.org/wiki/File:Operational...

    This image is a copy or a derivative work of txu-pclmaps-oclc-8322829_h_9.jpg, from the map collection of the Perry–Castañeda Library (PCL) of the University of Texas at Austin. This tag does not indicate the copyright status of the attached work.

  7. Iowa Department of Natural Resources - Wikipedia

    en.wikipedia.org/wiki/Iowa_Department_of_Natural...

    The Iowa Department of Natural Resources (Iowa DNR or IA DNR) is a department/agency of the U.S. state of Iowa formed in 1986, charged with maintaining state parks and forests, protecting the environment of Iowa, and managing energy, fish, wildlife, land resources, and water resources of Iowa.

  8. big.assets.huffingtonpost.com

    big.assets.huffingtonpost.com/athena/files/2025/...

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  9. File:Operational Navigation Chart C-9, 6th edition.jpg ...

    en.wikipedia.org/wiki/File:Operational...

    English: 1:1,000,000 scale Operational Navigation Chart, Sheet C-9, 6th edition. Covers Canada, United States. Lambert Conformal Conic Projection. Standard Parallels 65 20N and 70 40N. Center longitude 144 47 30W.