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TBM is referred to as a temporary benchmark. It is a fixed point from a known elevation from which all levels are taken. Mark on a channel or structure is used as a temporary bench mark.
TBM is referred to as a temporary benchmark. It is a fixed point from a known elevation from which all levels are taken. Mark on a channel or structure is used as a temporary bench mark.
See lessTemporary Benchmark Which you can use and reach to Permanent Benchmark
Temporary Benchmark Which you can use and reach to Permanent Benchmark
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