# Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 1 (Q.No. 2)
2.
If h is the difference in level between end points separated by l, then the slope correction is . The second term may be neglected if the value of h in a 20 m distance is less than
m
1 m
2 m
3 m
Explanation:
No answer description is available. Let's discuss.
Discussion:
67 comments Page 1 of 7.

Khagendra said:   3 years ago
For slope (M) up to 20%.
Slope correction(Sc) = h^2/(2l).
Here d = 20m,
M = h/d,
0.2 = h/20.
H = 0.2 * 20 = 4m.
Here the nearest one is 3m.
So 3m is the appropriate answer.
(14)

NARDOS TEFERI said:   11 months ago
For slope (M) up to 20%.
According to me, the solution is;

Slope correction(Sc) = h^2/(2l).
Here d = 20m,
M = h/d,
0.2 = h/20.
H = 0.2 * 20 = 4m.
(7)

Dev Narayan Yadav said:   3 years ago
l = 20 m.
H2 = 2l,
H2 = 2*20,
H2 = 40.
And;
H = 6.32 or 6.33,
√40 = 6.32.
(5)

Chaan A said:   1 year ago
Explain it clearly.
(4)

Mukesh das said:   3 years ago
How it will be 3m?

Please explain clearly with the completed formula.
(3)

Mukesh das said:   3 years ago
How it will be 3m?

Please explain clearly with the completed formula.
(3)

Nandhu said:   4 years ago
The second term can be negleted only if the slopes flatter than 1 in 25..
That means 4%.

i.e, 4% of 20m = 0.8(4/5) ie, H shouldn't higher than 0.8m.
So option A is right.
(3)

Second term will be neglected when h=3cm not 3meter for length 20 meter.
(2)

LATHA said:   6 years ago
H^2=2*20.
=6.32.

SUBSTITUTE THE VALUE IN THE FORMULA.
6.32^2/2*20+6.32^4/8*(20^3).
0.998+2.492=3.4 (approx).
(2)

Frlyrvllz said:   5 years ago
The formula (h^2/2L)+(h^4/8L^3) is for slope that ranges from 20%-30%.

If (h^4/8L^3) is to be neglected, h^2/2L is left and if we are going to equate it with 20% the answer would be 2.8~3 and if h^2/2L is to be equated to 30% the answer would be 3.4~3 therefore the answer is 3.
(1)