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As of 2010 there are six levels in the hierarchy, represented by hydrologic unit codes from 2 to 12 digits long, called regions, subregions, basins, subbasins, watersheds, and subwatersheds. The table below describes the system's hydrologic unit levels and their characteristics, along with example names and codes. [4]
A hydrological code or hydrologic unit code is a sequence of numbers or letters (a geocode) that identify a hydrological unit or feature, such as a river, river reach, lake, or area like a drainage basin (also called watershed in North America) or catchment.
A GIS watershed hydrology model link to evaluate water resources of the Lower Colorado River in Texas. In: Proceedings of Application of Advanced Information Technologies for the Management of Natural Resources. Sponsored by ASAE. June 17–19, 1993, Spokane, WA. Srinivasan, R. and J.G. Arnold. 1993. Basin scale water quality modeling using GIS.
The Texas–Gulf 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 ...
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.
The Pfafstetter Coding System is a hierarchical method of hydrologically coding river basins.It was developed by the Brazilian engineer Otto Pfafstetter [] in 1989. [1] It is designed such that topological information is embedded in the code, which makes it easy to determine whether an event in one river basin will affect another by direct examination of their codes.
The creek watershed and associated waters is designated by the United States Geological Survey as sub-watershed HUC 031300010206, is named the Lower Soque River sub-watershed, and drains an area of approximately 15 square miles west of Clarkesville and northwest of Demorest, as well as northwest of the Soque River.
Map of the Great Basin. The Great Basin is the largest region of contiguous endorheic drainage basins in North America, and is encompassed by the Great Basin Divide.This is a list of the drainage basins in the Great Basin that are over 500 sq mi (1,300 km 2), listed by the state containing most of the basin.