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During a fly levelling operation the following operation were made BS- 0.650,2.155,1.405,2.655,2.435 FS- 2.455,1.305,0.555, 2.405

written 6.3 years ago by teamques10 ★ 68k

•   modified 5.0 years ago

The first backside was taken on a BM of RL-90.500m from the last Backsight it is required to set four peg each a a distance of 30m on a falling gradient 1 in 100 calculate RL of these four pegs.

surveying

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written 6.3 years ago by teamques10 ★ 68k

Station	chainage	BS	IS	FS	Rise(+)	Fall(-)	RL	remark
BM		0.650					90.500
		2.155		2.455		1.805	88.695
		1.405		1.305	.850		89.545
		2.655		0.555	.850		90.394
	0	2.435		2.405	.250		90.645
Peg1	30		2.735			0.300	90.345
Peg2	60		3.035			0.300	90.045
Peg3	90		3.335			0.300	89.745
Peg4	120			3.635		0.300	89.445
Total		9.300		10.355	1.950	3.005

Check:

∑BS-∑FS = 9.300-10.355 = 1.055

∑Rise - ∑Fall = 1.950 – 3.005 = 1.055

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