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CE2254-SURVEYING-II-->View question


Asked On2017-05-14 22:23:20 by:Nikhil-bharadwaj

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 Profile leveling
The process of determining the elevations of a series of points at measured intervals along a line such as the centerline of a proposed ditch or road or the centerline of a natural feature such as a stream bed. Normally we will assign an elevation of 100.00 to the datum rather using the mean sea level elevation.
An extension of differential leveling Elevations are determined in the same manner.
The same definitions define the concepts and terms involved.
The same types of mistakes and errors are possible.
A page check should always be done.
A closure check should be done if the profile line runs between bench marks.
This type of levelling is also called as longitudinal sectioning. In high way, canal, railway or sewage line projects profile of the ground along chooses routes are needed. Along the route, in such cases, at regular interval readings are taken and RL of different points are found. Then the section of the route is drawn to obtain the profile. Given figure shows the plan view of the scheme of levelling and fig b shows the profile of the route. Vertical scale is usually larger compared to scale for horizontal distances for drawing profile of the route. It gives apparent picture of the profile of the route.


Answerd on:2015-01-16 Answerd By:manjarimattur

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Rise and Fall Method
For the same set up of an instrument, Staff reading is more at a lower point and less for a higher point. Thus, staff readings provide information regarding relative rise and fall of terrain points. This provides the basics behind rise and fall method for finding out elevation of unknown points. The major advantage of this system is it gives a visual picture of topography. The RL of intermediate station is also checked under this method, and this method is recommended for a long run of differential leveling for important and accurate works.

Height of Instrument Method
In any particular set up of an instrument height of instrument, which is the elevation of the line of sight, is constant. The elevation of unknown points can be obtained by subtracting the staff readings at the desired points from the height of instrument. This is the basic behind the height of instrument
method for reduction of level. The HC method is a very simple method, less tedious method quicker than rise and fall method. It can be used when there are no inter sights.



Answerd on:2015-01-16 Answerd By:manjarimattur

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