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State the purposes of following methods of leveling. i)Profile leveling, ii)Fly leveling, iii)Check leveling iv)Reciprocal leveling
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1. Profile leveling- To determine the undulation of ground surface along given line for alignment of road, canal or pipe, railway line

2. Fly leveling-It is used to for connecting B.M. to the starting point and to establish the B.M.

3. Check leveling-It is used to check the accuracy of the leveling work

4. Reciprocal leveling- It is used to find the difference in leveling between two points two point obstructed due to river or pond.
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