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I I I I I I I I I I I I I I I I I II I "1<: ); ~1I t Part 1: Dam and Flood Terminology (risk terminology in Part 2) TERM Acceptable Flood Capacity (AFC) Auxiliary Spillway Base Safety Condition (BSC) Crest (dam) Dam Dam Crest Flood (DCF) Dam Safety Emergency Plan (DSEP) Emergency Spillway DEFINITION The AFC for a specific dam is the overall flood capacity, including freeboard as relevant, which provides an appropriate level of safety against a flood initiated dam failure to protect the community and environment to acceptable risk levels, within the total context of overall dam safety from all causes. A secondary spillway designed to operate only during very large floods (used as a supplementary or emergency spillway) The flood capability of a dam beyond which the incremental adverse consequences of dam failure are acceptable, The uppermost surface of the dam proper, excluding parapets, handrails etc; may be called top of dam An artificial barrier, together with appurtenant works, constructed for storage, control or diversion of water, other liquids, silt, debris or other liquid-borne material. The flood event which, when routed through the reservoir, results in a still water level in the reservoir, excluding wave effects, which; . For an embankment is the lowest point of the embankment crest. . For a concrete dam is the uppermost level of the crest, excluding handrails, and normally parapets, unless the parapet is capable of supporting the flood surcharge load. . For a concrete faced rockfill dam, is the lowest point of the crest, unless a parapet is capable of supporting the flood surcharge load. A continually updated set of instructions and maps that deal with possible emergency situations or unusual occurrences at a related dam. As for auxiliary spillway. 30 ANCOLD Guidelines on Selection of an Acceptable flood Capacity for Dams