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PURPA

Public Utility Regulatory Policies Act of 1978, enacted following the energy crisis of the 1970s to encour­age cogeneration and renewable resources and promote competi­tion for electric […]

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Rock Fill Dam

An embankment dam in which more than 50% of the total volume is comprised of compacted or dumped cobbles, boulders, rock fragments, or quarried rock generally […]

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Masonry Dam

A dam constructed mainly of stone, brick, or concrete blocks pointed with mortar. A dam having only a masonry facing should not be referred to as […]

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Minimum Flow

The minimum flow that must be released from a project in order to meet environmental or other non-power water requirements. Flows are released either to a […]

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Floodplain Forest

Floodplain forests usually occur in the low, flood-prone areas along rivers, typically less than 20 feet above the river channel. They are often associated with oxbows […]

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False Attraction Flow

Water flows or turbulence that impede the ability of fish to locate an upstream or downstream fishway. False attraction flows can result from turbine discharge flows, […]

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Governor

The device which measures and regulates turbine speed by controlling wicket gate angle to adjust water flow to the turbine.

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Gravity Dam

Constructed from concrete or stone masonry and designed to hold back water by primarily using the weight of the dam itself to resist the horizontal pressure […]

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Hydraulic Fill Dam

An earth dam constructed of materials, often dredged, which are conveyed and placed by suspension in flowing water.