Question:
The Mean Sea Level (MSL) is the average height for the surface of the seas for all stages of tide over a period of
The Mean Sea Level (MSL) is the average height for the surface of the seas for all stages of tide over a period of
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Mean Sea Level is the datum used as the reference surface for levelling. It is obtained by averaging the height of the sea surface so that tidal variations are removed.
Updated On: Jun 16, 2026
- 18 years
- 19 years
- 20 years
- 21 years
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The Correct Option is B
Solution and Explanation
Concept:
Mean Sea Level is the datum used as the reference surface for levelling. It is obtained by averaging the height of the sea surface so that tidal variations are removed.
Step 1:
Tides repeat in a long cycle. To average out all stages of the tide, including the longest tidal cycle (the lunar nodal cycle of about 18.6 years), observations are taken over a period of about 19 years.
Step 2:
Hence the Mean Sea Level is defined as the average height of the sea surface for all stages of the tide over a period of 19 years. The other options do not cover the full tidal cycle.
Answer: Option (2) — 19 years.
Mean Sea Level is the datum used as the reference surface for levelling. It is obtained by averaging the height of the sea surface so that tidal variations are removed.
Step 1:
Tides repeat in a long cycle. To average out all stages of the tide, including the longest tidal cycle (the lunar nodal cycle of about 18.6 years), observations are taken over a period of about 19 years.
Step 2:
Hence the Mean Sea Level is defined as the average height of the sea surface for all stages of the tide over a period of 19 years. The other options do not cover the full tidal cycle.
Answer: Option (2) — 19 years.
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