# 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:

67 comments Page 6 of 7.
Kawal jee v said:
7 years ago

@Vijay.

How it comes 3.3? Explain your answer.

How it comes 3.3? Explain your answer.

Rahul verman said:
8 years ago

How it will come 3.3?

Abhilash jana said:
8 years ago

When distances are measured along the slope, the equivalent horizontal distance may be determined by applying a slope correction.

The vertical slope angle of the length measured must be measured. (Refer to the figure on the other side).

Thus, For gentle slopes, m<20%.

Ch = h^2/2l.

For steep slopes, 20% <= m <= 30%.

Ch = h^2/2l+h^4/8l^3.

For very steep slopes, m>30%.

Ch = l(1-cos0).

The vertical slope angle of the length measured must be measured. (Refer to the figure on the other side).

Thus, For gentle slopes, m<20%.

Ch = h^2/2l.

For steep slopes, 20% <= m <= 30%.

Ch = h^2/2l+h^4/8l^3.

For very steep slopes, m>30%.

Ch = l(1-cos0).

Chandradeep said:
8 years ago

For slopes greater than 5% the above formula must be adopted otherwise the second part of the formula can be neglected.

Since the first three options are less than or equal to 5% they can neglected as the 3m is greater than 5% the second part of formula must included. Hence the answer is (D) 3m.

Since the first three options are less than or equal to 5% they can neglected as the 3m is greater than 5% the second part of formula must included. Hence the answer is (D) 3m.

Suparna said:
8 years ago

If h2 = 4O. Then h = 6.324.

How it will come 3.3? Please explain.

How it will come 3.3? Please explain.

Rajesh said:
8 years ago

How it comes 3.3?

Rajesh said:
8 years ago

How it comes 3.3?

AKSHAY VASHISHT said:
8 years ago

Second term is neglected for slope less than 10%.

Slope for given problem for:

C) (2/20)*100 = 10%.

D) (3/20)*100 = 15%.

So for h = 2 m or less it is neglected.

And for h = 3 m it will be taken into account.

Slope for given problem for:

C) (2/20)*100 = 10%.

D) (3/20)*100 = 15%.

So for h = 2 m or less it is neglected.

And for h = 3 m it will be taken into account.

Raju said:
9 years ago

h square = 40.

Square root of 40 = 6.32 or 6.33.

How get it 3.3?

Square root of 40 = 6.32 or 6.33.

How get it 3.3?

Siva said:
9 years ago

h2 = 40 root 40 = 6.32.

How can you get 3.3?

How can you get 3.3?

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