- Asked 3/34
- 2078 Chaitra · 6 marks
- 2073 Magh
- 2068 Magh (old course)
Updating information across survey stages
Short answer
Data from each stage is verified and refined in the next: map-study routes are field-checked during reconnaissance; reconnaissance notes are precisely measured in the preliminary survey; the preliminary plan guides final centre-line setting with adjustments for earthwork and structures. Estimates evolve from rough to detailed.
Explain how the information collected in the preceding stages of survey is updated/utilised in the succeeding stages of highway alignment (road alignment) survey.
The survey stages build on each other: the data from one stage is reused and refined in the next, so the work is not repeated and the choice becomes firmer.
| Stage | Information used from earlier stage | Information added or updated |
|---|---|---|
| Map study | Terminal points and obligatory points; policy | Alternative routes on maps, rough lengths and gradients |
| Reconnaissance | Routes marked in the map study | Field check of the routes, soil, drainage, geology, land use; some routes rejected; rough cost estimate |
| Preliminary survey | Selected route(s) from reconnaissance | Accurate traverse, levelling, contours, hydrology, soil and material data; comparison of alternatives |
| Final location and detailed survey | Contour plan and the chosen route from the preliminary survey | Centre line set out, curves, final profile, cross-sections, design details, bill of quantities |
How the updating is done
- Map-study routes are checked and corrected in the field during reconnaissance (e.g. a route marked over a ridge may be found to pass through a landslide area).
- The reconnaissance observations on soil, streams and materials are measured accurately in the preliminary survey.
- The preliminary contour plan is used to fix the centre line, and minor changes (smoother curves, balanced earthwork, a better stream crossing) are made at the final location.
- Estimates are updated: rough -> preliminary -> detailed.
- Any new obstacle found at a later stage can send the study back to the previous stage.
Thus the information is continuously verified, refined and extended from broad to detailed.
✓ Answer checked by Claude Opus 5.5 (high effort)
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