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<br />
<br />Examination report: A written report that documents the condition of the facility during
<br />the examination, operation and maintenance activities accomplished since the last
<br />examination, and recommendations necessary for the continued safe and efficient
<br />operation of the facility.
<br />
<br />Exit conference: A discussion following a facility review examination involving
<br />examination team members and interested representatives of the water users, project, and
<br />region. The topics of discussion include the overall condition of the facility, any
<br />recommendations made as a result ?f the examination, and any other pertinent topics.
<br />
<br />F
<br />
<br />Face, dam: Exposed surface of dam materials (earth, rockfill, or concrete), upstream and
<br />downstream.
<br />
<br />Facility review, comprehensive: A detailed examination performed on dams with a
<br />senior dam engineer. State-of-the-art design characteristics are also evaluated.
<br />
<br />Facility review, periodic: An examination on dams generally without the involvement of
<br />a senior dam engineer.
<br />
<br />Failure: An incident resulting in the uncontrolled release of water from a dam.
<br />
<br />Fault, earthquake: A fracture in rock along which the adjacent rock surfaces are
<br />differentially displaced.
<br />
<br />Flashboard: Wooden board or structural panel anchored to the crest of a spillway used
<br />as a means of increasing the reservoir storage.
<br />
<br />Flood, designated frequency and its probability: A 100-year flood is often considered
<br />in the design of diversion dams and for diversion-during-construction requirements.
<br />Service spillways, stilling basins, and some outlet works components may also be
<br />designed to pass certain level of floods designated by a return period. The return period
<br />should be thought as the chance that such a flood will be equaled or exceeded in anyone
<br />year. For example, the 100-year flood is the flow level with a 0.01 annual exceedance
<br />probability, or there is I chance in 100 that this flood flow level will be equaled or
<br />exceeded in any given year.
<br />
<br />Flood, inflow, design (IDF): That flood used for design of a safe structure. It may be the
<br />PMF (probable maximum flood), but in sparsely developed areas where judgment
<br />indicates minimal property damage and no probable loss of life, the design flood may be
<br />less than the PMF.
<br />
<br />Flood, moderate frequency: A flood of lesser magnitude than the IDF used for the
<br />service spillway design when supplemented by a separate auxiliary spillway.
<br />
<br />Flood, probable maximum (PMF): The largest flood reasonably expected at a point on
<br />a stream) because of a probable maximum storm and favorable runoff conditions.
<br />
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