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What are subbasins and what is their significance to the NHD?

April 26, 2017nhd significance

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What are subbasins and what is their significance to the NHD?

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The United States is divided into 2,267 subbasins which vary in size according to the drainage area. There are 2,120 subbasins identified for the conterminous US and Hawaii. Of these, 10 are “empty” subbasins (mainly water) and there is no NHD data. There are 136 subbasins in Alaska, 6 subbasins in Puerto Rico, 2 subbasins in the Virgin Islands. This data will be available as high-resolution NHD data. There are 3 subbasins in the Caribbean Outlying Area that will not be included in the NHD.