# 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 thanDiscussion:

66 comments Page 1 of 7.
Khagendra said:
2 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.

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.

(5)

Nandhu said:
3 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.

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.

(2)

LATHA said:
5 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).

=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).

(1)

Mukesh das said:
2 years ago

How it will be 3m?

Please explain clearly with the completed formula.

Please explain clearly with the completed formula.

(1)

Dev Narayan Yadav said:
2 years ago

l = 20 m.

H2 = 2l,

H2 = 2*20,

H2 = 40.

And;

H = 6.32 or 6.33,

√40 = 6.32.

H2 = 2l,

H2 = 2*20,

H2 = 40.

And;

H = 6.32 or 6.33,

√40 = 6.32.

(1)

Vaibhav rana said:
6 years ago

@All.

Answer is 1

Very simple put tan(3°)=h/20.

You will get the answer.

h=1m.

Answer is 1

Very simple put tan(3°)=h/20.

You will get the answer.

h=1m.

Tapas Kumar Dinda said:
4 years ago

H^4/8L^3 = 0 or near to 0 which is neglected to measure, when I put h<3 (1/2,1,2), results are below 1mm, which is hard to measurable. So, 3 is correct.

Durga said:
5 years ago

How can you get 3? Please explain the solution in detail.

Ghalib said:
5 years ago

For slope less than 1 in 25 so h/l is less than or eqal to1 in 25 so h is q.

Equal to or less than (.8).

Equal to or less than (.8).

Aniket said:
5 years ago

In (h^4) / (8l^3), The Value comes out 0.008 (Almost 0%) up to filling of h=2.9. At h=3m the value comes out 0.01.

so, h=3 is the right answer.

so, h=3 is the right answer.

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