Points to be Considered During Reconnaissance Survey
Reconnaissance survey is an important stage in route location, especially in road surveying. It involves a preliminary inspection of the area to identify suitable routes and gather essential field information. Proper consideration of various factors during this survey ensures selection of an economical, safe, and efficient alignment. For ITI Surveyor trainees, understanding these points is essential.
Objective of Reconnaissance Survey
- To explore possible routes
- To identify obstacles and ground conditions
- To collect preliminary data for planning
- To select the best alignment
Important Points to be Considered
1. Topography of the Area
Study the general features of the land such as hills, valleys, slopes, and plains. Avoid steep gradients and select routes with gentle slopes.
2. Alignment of the Route
Select the shortest and most economical route while maintaining safety and convenience.
3. Soil Conditions
Examine the type of soil along the route. Avoid weak or unstable soils that may affect construction.
4. Drainage and Water Sources
Consider rivers, streams, and drainage patterns. Ensure proper water flow and avoid flood-prone areas.
5. Obstacles
Identify natural and man-made obstacles such as forests, buildings, railways, and utility lines.
6. Availability of Materials
Check availability of construction materials like sand, gravel, and stones nearby to reduce cost.
7. Traffic Requirements
Consider expected traffic volume and type for future road use.
8. Environmental Factors
Assess environmental impact such as deforestation, pollution, and effect on wildlife.
9. Accessibility
Ensure that the route is accessible for construction equipment and labor.
10. Economy
Select a route that minimizes construction and maintenance cost.
11. Safety
Ensure the route is safe for vehicles, avoiding sharp curves and steep gradients.
Methods Used in Reconnaissance Survey
- Field inspection
- Use of maps and aerial photographs
- Use of GPS and modern tools
Importance in Surveyor Trade
- Helps in selecting best route alignment
- Reduces cost and construction difficulties
- Provides base data for detailed surveys
Precautions
- Observe all features carefully
- Take notes and sketches
- Verify information with maps
- Consider future development
Conclusion
Reconnaissance survey is a crucial step in route location. Proper consideration of factors such as topography, soil, drainage, and economy ensures selection of a suitable alignment.
For ITI Surveyor trainees, understanding these points is essential for efficient planning and successful execution of road projects.