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Run-of-river hydroelectricity (ROR) or run-of-the-river hydroelectricity is a type of hydroelectric generation plant whereby little or no water storage is provided. Run-of-the-river power plants may have no water storage at all or a limited amount of storage, in which case the storage reservoir is referred to as pondage .
The hydraulic head either occurs naturally, such as a waterfall, or is created by constructing a dam in a river valley, creating a reservoir. Using a controlled release of water from the reservoir drives the turbines. The costs and environmental impacts of constructing a dam can make traditional hydroelectric projects unpopular in some countries.
An additional defining feature of small hydro is known as run-of-river, or that the physical impact of the project is relatively minuscule compared to major hydroelectric dams which require a water storage lake. Little water is stored behind the project, if at all, and the river is usually able to continue flowing. [8]
The Dalles Lock and Dam is a concrete-gravity run-of-the-river dam spanning the Columbia River, two miles (3.2 km) east of the city of The Dalles, Oregon, United States. [2] It joins Wasco County, Oregon , with Klickitat County, Washington , 192 miles (309 km) upriver from the mouth of the Columbia near Astoria, Oregon .
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Ryan Dam is a hydroelectric dam on the Missouri River, 10 miles (16 km) downstream from the city of Great Falls in the U.S. state of Montana. The dam is 1,336 feet (407 m) long and 61 feet (19 m) high; its reservoir is 7 miles (11 km) long and has a storage capacity of 5,000 acre-feet (6,200,000 m 3). It is a run-of-river dam.
Beeston Hydro on the River Trent Beeston Hydro is a small hydroelectric scheme , in Beeston, Nottinghamshire . It is located on the River Trent , and generates up to 1.66 MW of electricity.
Limestone Generating Station is a run-of-the-river [1] hydroelectric dam on the Nelson River approximately 750 kilometres (470 mi) north of Winnipeg near Gillam, Manitoba.Part of the Nelson River Hydroelectric Project, Limestone was Manitoba Hydro's fifth and largest generating station to be built on the Nelson River.