Civil Engineering - Surveying - Discussion

Discussion Forum : Surveying - Section 1 (Q.No. 49)
49.
Keeping the instrument height as 1.5 m, length of staff 4 m, the slope of the ground as 1 in 10, the sight on the down-slope, must be less than
30 m
25 m
20 m
15 m
Explanation:
No answer description is available. Let's discuss.
Discussion:
26 comments Page 2 of 3.

Swami said:   7 years ago
Here, 2.5 * 10 = 25.

Avshesh said:   6 years ago
Staff visible= 4-1.5=2.5m,
Site=2.5/(1/10),
= 2.5x10,
= 25m.

Sameer sopori said:   6 years ago
If we are levelling on the sloped surface then we need to keep staff near the instrument, otherwise, it will not be visible inside the instrument because of the slope (if the distance is more).
so here is the formula, UNDER WHICH DISTANCE WE MUST KEEP STAFF,
Sight= (Staff ht.- instrument ht.)/(1/10)
= (4 - 1.5) /0.1,
= 2.5/0.1,
= 25m.

If you will keep the staff more than 25m away from the instrument , IT WILL NOT BE VISIBLE INSIDE THE INSTRUMENT,
(5)

Mamatamayee said:   6 years ago
Thanks @Sameer.

Sagar said:   6 years ago
Thanks @Sameer.

BIKAS said:   5 years ago
Thanks @sameer.

But if rising slope then maximum distance measured only 15 meters am I right?

Malla pramod said:   5 years ago
Thanks all.

Shubham said:   5 years ago
Thanks @Sameer.

Vikash said:   4 years ago
Thanks all.

Waleed said:   4 years ago