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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.
Subsequently every watershed along this coast is assigned a number using the Pfafstetter Coding System. This implies that the four largest watersheds are selected and receive numbers 2,4,6, or 8. The watersheds in between the large systems receive numbers 3, 5, and 7. Numbers 1 and 9 are used for the small watersheds on the edges of the strait.
The Clackamas River is an approximately 83-mile (134 km) tributary of the Willamette River in northwestern Oregon, in the United States.Draining an area of about 940 square miles (2,435 km 2), the Clackamas flows through mostly forested and rugged mountainous terrain in its upper reaches, and passes agricultural and urban areas in its lower third.
The pieces include units that drain to segments of streams, remnant areas, noncontributing areas, and coastal or frontal units that can include multiple watersheds draining to an ocean or large lake. Hence, half or more of the hydrologic units are not watersheds as the name of the framework Watershed Boundary Dataset (WBD) implies.
Fanno Creek is a 15-mile (24 km) tributary of the Tualatin River in the U.S. state of Oregon. [3] Part of the drainage basin of the Columbia River, its watershed covers about 32 square miles (83 km 2) in Multnomah, Washington, and Clackamas counties, including about 7 square miles (18 km 2) within the Portland city limits.
It drains an area of the high North Cascades in the watershed of Puget Sound north of Seattle, and east of Mount Baker. With a watershed of approximately 270 square miles (700 km 2 ) in a complex of deep valleys partially inside North Cascades National Park , it is the last major tributary of the Skagit before the larger river reaches its mouth ...
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Arnold Creek is a tributary of Middle Island Creek, 10.9 miles (17.5 km) long, [5] in West Virginia in the United States.Via Middle Island Creek and the Ohio River, it is part of the watershed of the Mississippi River, draining an area of 34.7 square miles (90 km 2) [6] in a rural region on the unglaciated portion of the Allegheny Plateau.