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According to the US Geological Survey, there are 5 steps to manual watershed delineation: [6] Find the point of interest along a stream on the map. This is the "watershed outlet" or "pour point." Imagine or draw surface water flow lines that point downhill perpendicular to the topographic contours (this is the steepest direction).
This map of United States water resource subregion hydrologic units updated boundaries to include the ocean as well as the portions of the basins that cross international borders For the use of hydrologists, ecologists, and water-resource managers in the study of surface water flows in the United States, the United States Geological Survey ...
The Tolt River is located in the western foothills of the Cascade Mountains in north central King County in the U.S. state of Washington.The river begins at the confluence of the North Fork Tolt and South Fork Tolt rivers.
A water resource region is 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 as part of the U.S. hydrologic unit system. This first level of classification divides the United States into 21 major geographic areas, or regions.
Map of Paint Creek highlighted within the Scioto River watershed. Paint Creek is a tributary of the Scioto River, 94.7 miles (152.4 km) long, [4] in south-central Ohio in the United States. [5] Via the Scioto and Ohio Rivers, it is part of the watershed of the Mississippi River. It drains an area of 1,143 square miles (2,960 km 2). [4]
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.
The Bull Run River is a 21.9-mile (35.2 km) tributary of the Sandy River in the U.S. state of Oregon.Beginning at the lower end of Bull Run Lake in the Cascade Range, it flows generally west through the Bull Run Watershed Management Unit (BRWMU), a restricted area meant to protect the river and its tributaries from contamination.
Map of the Muskingum River watershed showing the Licking River Historic view of the Licking River from "Geography of Ohio," 1923. The Licking River is a tributary of the Muskingum River, about 40 mi (65 km) long, in central Ohio in the United States. Via the Muskingum and Ohio Rivers, it is part of the watershed of the Mississippi River.