Alalise reeperi eesmärk on säilitada kõrgus muutusteta pika aja jooksul, viidates vastuvõtuajale, ja see reeper asub tavaliselt seal, kus häirivad mõjud arvatakse olevat tähtsusetud.
Permanent benchmark is intended to maintain its elevation without change over a long period of time with reference to an adopted datum, and is located where disturbing influences are believed to be negligible.
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