Question

What is the significance of 21 r written in blue in topo sheet

Answer 1

Answer:

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Explanation:

Hello

The letter ‘r’ has three meanings.

1)If it is seen near the bank of a River then it tells you about the depth of the river at that point.

2)If it is seen near a Tank then it is the depth of the tank,

However,If you see an embankment on that tank then it is telling you about the height of that embankment.

3)If it is seen near a Sand Dune then it tells you about its height.

I hope this helps.

Thank you.

Answer 2

Relative height of the unlined well is 21 m.