How Does a River Affect Chaining Accuracy in Surveying?

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SUMMARY

The discussion focuses on the impact of a river's flow on chaining accuracy in surveying. A survey line ABC crosses a river perpendicularly, with points B and C located on opposite banks. Measurements indicate that line BD is 60 meters long, with bearings of DC at 33 degrees 30 minutes and DA at 131 degrees 20 minutes. Given that AB measures 42 meters, the calculated length of BC is determined to be 50.74 meters.

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a river is flowing east west and a survey line ABC crosses the river perpendicular to the direction of flow.B is situated on the near bank and C on the far bank.A line BD 60 m long,was laid at B,perpendicular to AB,and the bearing of DC and DA were measured and found to be 33 degrees 30 minutes and 131 degrees 20 minutes respectively.if AB is 42 m .calculate the length of BC.

only post me the sketch and correct answer for that problem.
 
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