Surveying
Check lines (or proof lines) in Chain Surveying, are essentially required

To increase the out-turn
To plot the offsets
To indicate the accuracy of the survey work
To plot the chain lines

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Surveying
The difference between a level line and a horizontal line is that

level line is a curved line while hori-zontal line is a straight line
both are same
level line is normal to plumb line while horizontal line may not be normal to plumb line at the tangent point to level line
horizontal line is normal to plumb line while level line may not be normal to the plumb line

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