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As mentioned, when a river rejuvenates, it gains more energy and erodes vertically to meet its new base level. A river terrace is the remains of an old floodplain at a higher elevation than the present one. It typically results from river rejuvenation with further rejuvenation able to form new terraces, resulting in a step like profile around a ...
Changes in the steepness of the stream gradient, the amount of sediment contained in the river, and the total amount of water flowing through the system, all influence how a river behaves. There is a delicate equilibrium that controls a river system, which, when disturbed, causes flooding and incising events to occur and produce terracing. [3] [4]
Connoquenessing Creek in Butler, Pennsylvania. In 2000, a scientific study was conducted to determine the health of the creek. Researchers discovered that only the Mississippi River received more toxic materials than the Connoquenessing, making the small river the second most polluted waterway in the United States.
Wyoming Valley and the Susquehanna River in Luzerne County. Detached from the rest of Pennsylvania's anthracite fields, this canoe-shaped valley is also known as the Wyoming Valley and is home to the cities of Scranton and Wilkes-Barre. The largest city in the Wyoming Valley is Scranton, with a population of 77,291.
Pennsylvania Scenic Rivers are rivers that are designated "scenic" according to the criteria of the Pennsylvania Scenic Rivers Act (P.L. 1277, Act No. 283 as amended by Act 110, May 7, 1982). The scenic rivers are managed by a variety of State agencies and local conservancies.
French Creek begins near French Creek, New York, and flows about 117 miles (188 km) to the Allegheny River at Franklin, Pennsylvania. The creek's drainage basin covers 1,270 square miles (3,300 km 2). [7] The watershed includes parts of Erie, Crawford, Venango, and Mercer counties in Pennsylvania as well as Chautauqua County in New York. [1]
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A drop in base level causes a response by the river system to carve into the landscape. This incision begins at the formation of a knickpoint, and its upstream migration depends heavily upon the drainage area (and so the discharge of the river), material through which it cuts, and how large the drop in base level was. [7]