degree of accuracy required
method of setting out the perpendiculars and nature of ground
scale of plotting
all of the above
Answer is Right!
Answer is Wrong!
The correct answer is D. all of the above.
The allowable length of an offset depends on the following factors:
- The degree of accuracy required. The more accurate the required result, the shorter the allowable offset.
- The method of setting out the perpendiculars and nature of ground. If the perpendiculars are set out using a theodolite, the allowable offset will be greater than if they are set out using a tape measure. The nature of the ground will also affect the allowable offset. For example, if the ground is very uneven, the allowable offset will be less than if the ground is flat.
- The scale of plotting. The scale of plotting is the ratio of the distance on the map to the actual distance on the ground. The smaller the scale of plotting, the shorter the allowable offset.
The allowable length of an offset is usually specified in the project specifications. If it is not specified, the engineer should consult with the client to determine the required accuracy.