A report on HydropowerWatermill and River

The Three Gorges Dam in China; the hydroelectric dam is the world's largest power station by installed capacity.
Watermill of Braine-le-Château, Belgium (12th century)
The Amazon River (dark blue) and the rivers which flow into it (medium blue).
A water piston from the Nongshu by Wang Zhen (fl. 1290–1333)
Interior of the Lyme Regis watermill, UK (14th century)
The start of a mountain stream.
Saint Anthony Falls, United States; hydropower was used here to mill flour.
Model of a Roman water-powered grain-mill described by Vitruvius. The millstone (upper floor) is powered by an undershot waterwheel by the way of a gear mechanism (lower floor)
Melting toe of Athabasca Glacier, Jasper National Park, Alberta, Canada
Directly water-powered ore mill, late nineteenth century
Scheme of the Roman Hierapolis sawmill, the earliest known machine to incorporate a crank and connecting rod mechanism.
The Colorado River at Horseshoe Bend, Arizona
Benoît Fourneyron, the French engineer who developed the first hydropower turbine
Roman turbine mill at Chemtou, Tunisia. The tangential water inflow of the millrace made the horizontal wheel in the shaft turn like a true turbine, the earliest known.
The Porvoo River (Porvoonjoki) in the medieval town of Porvoo, Finland
A shishi-odoshi powered by falling water breaks the quietness of a Japanese garden with the sound of a bamboo rocker arm hitting a rock.
Medieval watermill
Nile River delta, as seen from Earth orbit. The Nile is an example of a wave-dominated delta that has the classic Greek letter delta (Δ) shape after which river deltas were named.
A conventional dammed-hydro facility (hydroelectric dam) is the most common type of hydroelectric power generation.
German ship mills on the Rhine, around 1411
A radar image of a 400 km river of methane and ethane near the north pole of Saturn's moon Titan
Chief Joseph Dam near Bridgeport, Washington, is a major run-of-the-river station without a sizeable reservoir.
A Northern Song era (960–1127) water-powered mill for dehusking grain with a horizontal wheel
River meandering course
Micro hydro in Northwest Vietnam
An Afghan water mill photographed during the Second Anglo-Afghan War (1878-1880). The rectangular water mill has a thatched roof and traditional design with a small horizontal mill-house built of stone or perhaps mud bricks
Flash flooding caused by a large amount of rain falling in a short amount of time
The upper reservoir and dam of the Ffestiniog Pumped Storage Scheme in Wales. The lower power station can generate 360 MW of electricity.
A watermill in Tapolca, Veszprem County, Hungary
The mouth of the River Seaton in Cornwall after heavy rain caused flooding and significant erosion of the beach.
Roblin's Mill, a watermill, at Black Creek Pioneer Village in Toronto, Ontario, Canada
Frozen river in Alaska
Watermills on the Pliva in Jajce, Bosnia and Herzegovina
Leisure activities on the River Avon at Avon Valley Country Park, Keynsham, United Kingdom. A boat giving trips to the public passes a moored private boat.
The interior of a functional watermill at Weald and Downland Open Air Museum
Watermill in Belgium.
Mulino Meraviglia in San Vittore Olona, Italy, along Olona river
River bank repair
Dalgarven Mill, Ayrshire, United Kingdom
A breastshot waterwheel at Dalgarven Mill, United Kingdom
Watermill in Kuusamo (Finland)
Watermill in Jahodná (Slovakia)
Watermill in Caldas Novas, Brazil
Former watermill in Kohila, Estonia
Undershot water wheel, applied for watermilling since the 1st century BC
Overshot water wheel, applied for watermilling since the 1st century BC
Breastshot water wheel, applied for watermilling since the 3rd century AD<ref name="Wikander 2000, 375"/>
Pitchback water wheel, often used to increase the power generated by a breastshot wheel<ref name="Yorke">{{cite book|last=Yorke|first=Stan|title=The Industrial Revolution explained|publisher=Countryside Books|location=Newbury, Berks|year=2005|pages=20–31|isbn=978-1-85306-935-2}}</ref>

A watermill or water mill is a mill that uses hydropower.

- Watermill

Since ancient times, hydropower from watermills has been used as a renewable energy source for irrigation and the operation of mechanical devices, such as gristmills, sawmills, textile mills, trip hammers, dock cranes, domestic lifts, and ore mills.

- Hydropower

Nonetheless, it has economic, sociological, and environmental downsides and requires a sufficiently energetic source of water, such as a river or elevated lake.

- Hydropower

Most of the major cities of the world are situated on the banks of rivers, as they are, or were, used as a source of water, for obtaining food, for transport, as borders, as a defensive measure, as a source of hydropower to drive machinery, for bathing, and as a means of disposing of waste.

- River

Typically, water is diverted from a river or impoundment or mill pond to a turbine or water wheel, along a channel or pipe (variously known as a flume, head race, mill race, leat, leet, lade (Scots) or penstock).

- Watermill

Fast flowing rivers and waterfalls are widely used as sources of energy, via watermills and hydroelectric plants.

- River
The Three Gorges Dam in China; the hydroelectric dam is the world's largest power station by installed capacity.

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