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Hydropower Fundamentals

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Hydroelectric Dam

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A structure that blocks the flow of river water to create a reservoir or raise water level for energy generation purposes.

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Generator

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A machine that converts mechanical energy into electrical energy.

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Fish Ladder

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A structure that allows migratory fish to pass around barriers like dams.

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Flow Rate

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The volume of water passing a point in a given period of time, it is crucial for determining hydropower potential.

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Penstock

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A pipe or conduit that carries water from the reservoir to the turbines in a hydropower plant.

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Pumped Storage

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A form of hydropower that stores energy by pumping water uphill to a reservoir during periods of low demand and releasing it during high demand.

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Hydropower

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The use of flowing water to produce electrical energy.

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Hydraulic Efficiency

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The efficiency at which a hydropower plant converts the energy of water into mechanical energy.

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Run-of-River Hydropower

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A type of hydropower generation that utilizes the natural flow of a river without a large reservoir.

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Capacity Factor

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The ratio of the actual output of a power plant to its potential output if it could operate at full-rated capacity continuously.

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Impulse Turbine

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A type of water turbine where jets of water hit the turbine blades creating motion.

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Head

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The vertical distance between the water source and the turbine, which determines the potential energy available for hydropower generation.

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Rated Capacity

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The maximum electrical output a hydropower plant can produce under specific conditions.

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Environmental Flow

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The water flow regimes provided within a river, wetland, or coastal zone to maintain ecosystems and their benefits.

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Water Footprint

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The total volume of fresh water used to produce the goods and services consumed by an individual or community.

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Siltation

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The accumulation of sediments in reservoirs, which can reduce the capacity and efficiency of hydropower plants.

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Turbine

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A device that converts the kinetic energy of water into mechanical energy.

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Reaction Turbine

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A water turbine that operates with both the water's pressure and velocity to create motion.

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Gross Head

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The total height difference between the water intake and the tailrace where the water reenters the watercourse.

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Renewable Energy Certificate (REC)

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A market-based instrument that represents the property rights to the environmental, social, and other non-power attributes of renewable electricity generation.

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