Section 4: Soil and Water Conservation Engineering
Surveying and Levelling
Subtopic: Chain surveying, methods of traversing
Question Statement:
A 20 m chain used for surveying is found to be actually 19.7 m. If the actual distance is 1200 m, the chain distance in m will be________.
Official Answer Key:
1218.0 to 1218.5
Step-by-Step Solution & Explanation
Because the chain is shorter than its nominal length (19.7 m instead of 20 m), it registers MORE length units to cover the same ground distance. The recorded (chain) distance for a known true distance is:
Chain distance = True distance × (nominal length / true chain length) = 1200 × (20/19.7) = 1218.27 m.
Soil and Water Erosion
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