Surveying
The rise and fall method

provides a check on the reduction of intermediate point levels
quicker and less tedious for large number of intermediate sights
is less accurate than height of instrument method
is not suitable for levelling with tilting levels

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

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

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