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42. A site inspection is intended to make a summary description of the dam’s condition and, if a minor deficiency was discovered during a prior inspection, to monitor the evolution of the deficiency.

An inspection is intended to check a dam’s condition in all aspects and to monitor its behavior. It may include the taking of measurements and the analysis thereof.

42. Unless a dam has deficiencies or deteriorations that necessitate closer monitoring, a dam must undergo the minimum number of inspections per year applicable to its classification as determined under Division I of Chapter III, as follows:

(1) Class A: 12 inspections;

(2) Class B: 6 inspections;

(3) Class C: 3 inspections;

(4) Class D: 2 inspections;

(5) Class E: 1 inspection.

A formal inspection counts as a regular inspection and a site inspection for the year in which the formal inspection is carried out. A regular inspection counts as a site inspection.

Taking the preceding rules into account, the type and frequency of inspections depend upon the dam classification and upon whether dam behaviour is stabilized or not, in accordance with the following table:

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Dam Classification and Dam Behaviour

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Type of Inspection A B C D E

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I II I II I II I II I II

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Site - 1/M - 1/2M - 3/Y - 2/Y 1/Y 1/Y

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Regular 1/M 4/Y 1/2M 3/Y 3/Y 2/Y 2/Y 1/Y - 1/5Y

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Formal 1/Y 1/Y 1/Y 1/2Y 1/2Y 1/5Y 1/3Y 1/8Y 1/5Y 1/10Y

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Dam Classification and Dam Behaviour

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Type of Inspection A B C D E

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I II I II I II I II I II

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Site - 1/M - 1/2M - 3/Y - 2/Y 1/Y 1/Y

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Regular 1/M 4/Y 1/2M 3/Y 3/Y 2/Y 2/Y 1/Y - 1/5Y

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Formal 1/Y 1/Y 1/Y 1/2Y 1/2Y 1/5Y 1/3Y 1/8Y 1/5Y 1/10Y

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Legend: I: first years of the dam’s operation when its behaviour is not stabilized

II: subsequent years of operation when its behaviour has stabilized

M: month

Y: year

Inspections that must be carried out yearly shall be carried out as evenly as possible over the 12 months of the year.