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
. The second term may be neglected if the value of h in a 20 m distance is less than
m1 m
2 m
3 m
Discussion:
67 comments Page 6 of 7.
Frlyrvllz said:
6 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.
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)
Swathi said:
6 years ago
How will get 3.3?
Amrit kshetri said:
6 years ago
The question is wrong it should be h2/2l -h4/8l3 instead of h4/8l3.
Nagadhar said:
6 years ago
How will get 3.3?
Sachin said:
6 years ago
ASSUMING L=100m then ,Cs=(400/(2*100))+(8000/(8*100^3)= 2.001m.
Which less than 3m.
Which less than 3m.
Ajaypal singh nirala said:
5 years ago
If the value of h is maximum then h^4 value is greater than the other value. So how is possible to this? Value goes nearest to zero right?
Logeshkanna said:
5 years ago
The answer should be A. 1/2m.
With ref of Punmia : the second term in slope correction shall be neglected for slopes flatter than about 1 in 25 (i.e slope should be lesser than 0.04).
The slope is Vertical distance/Horizontal distance.
.
Here Vertical distance is h and the horizondal distance is √((L)^2 - (h)^2).
L = 20 given in the problem. We need to find, for which value of h the slope will be less than 0.04.
Sub h = 0.5, we get slope = 0.025;
Sub h = 1, we get slope = 0.050;
Sub h = 2, we get slope = 0.100;
Sub h = 3, we get slope = 0.150;
Therefore Option A (h=0.5m) is the correct answer.
With ref of Punmia : the second term in slope correction shall be neglected for slopes flatter than about 1 in 25 (i.e slope should be lesser than 0.04).
The slope is Vertical distance/Horizontal distance.
.
Here Vertical distance is h and the horizondal distance is √((L)^2 - (h)^2).
L = 20 given in the problem. We need to find, for which value of h the slope will be less than 0.04.
Sub h = 0.5, we get slope = 0.025;
Sub h = 1, we get slope = 0.050;
Sub h = 2, we get slope = 0.100;
Sub h = 3, we get slope = 0.150;
Therefore Option A (h=0.5m) is the correct answer.
(1)
Fayez abusafaqa ps said:
5 years ago
The error can be accepted upto 10%. thus, the second term divided by the correlational factor equal 0.1.
Assuming the first term is x and the second term is y. Then y/x+y=0.1==> x+y/x=10 with y not zero==>1+x/y=9==>y=9. solve it u will get l=3.
Assuming the first term is x and the second term is y. Then y/x+y=0.1==> x+y/x=10 with y not zero==>1+x/y=9==>y=9. solve it u will get l=3.
(1)
Nandhu said:
5 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.
(4)
Kartabo Ketema said:
5 years ago
How it will be 3m? Explain it with the formula.
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