Civil Engineering - Surveying - Discussion
Discussion Forum : Surveying - Section 2 (Q.No. 16)
16.
Keeping the instrument height as 1 
m, length of staff 4 m, the up gradient of the ground 1 in 10, the sight on the up slope must be less than
m, length of staff 4 m, the up gradient of the ground 1 in 10, the sight on the up slope must be less thanDiscussion:
42 comments Page 2 of 5.
Garry said:
8 years ago
I agree @Amitkumarsachin.
Ritu said:
8 years ago
What is the formula for sight on the down slope?
Ms ali said:
8 years ago
@Amitkumar.
You are right it is 15m.
You are right it is 15m.
Aamir said:
8 years ago
I also agree with you @Amitkumar, it should be 15m.
Tera bhai said:
8 years ago
Absolutely right @Amit Kumar.
Tanmoy said:
7 years ago
The answer will be 20 because the slope is 1 in 10 it means in every 10 mtr slope height increasing 1 mtr then in 20 mtr it will be 2 mtr where HI is 1.5 mtr ( Slope is UPWARD).
Tanmoy karmakar said:
7 years ago
I agree the answers is 15 m.
Sameer sopori said:
7 years ago
@All , Here is the explanation.
If we keep the instrument at downside on slope surface (1/10), then staff distance should not be more than 15m, otherwise, we can not see the reading on staff, as per this equation.
The Horizontal distance = height of staff/ slope ratio, d= 1.5/(1/10) = 15m.
Then the instrument will be moved to forward (upward direction) for BACK SIGHT reading, then we need to keep the instrument at this distance = (4-1.5) / (1/10) = 25m, more than 25m we can not see the staff or staff readings.
So, the total horizontal distance is 15+25 = 45m.
If we keep the instrument at downside on slope surface (1/10), then staff distance should not be more than 15m, otherwise, we can not see the reading on staff, as per this equation.
The Horizontal distance = height of staff/ slope ratio, d= 1.5/(1/10) = 15m.
Then the instrument will be moved to forward (upward direction) for BACK SIGHT reading, then we need to keep the instrument at this distance = (4-1.5) / (1/10) = 25m, more than 25m we can not see the staff or staff readings.
So, the total horizontal distance is 15+25 = 45m.
(1)
Skm said:
7 years ago
Agree, it should be 15 m.
Akash said:
7 years ago
Why H.I is 3/2?
please explain.
please explain.
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