Why is the map study verified in the field?

Maps may be old and miss new buildings, landslides or rivers

Field work is cheaper than map study

To avoid doing the preliminary survey

Why does reconnaissance keep only one to three routes?

To save time and money in the costly preliminary survey

Because only three routes exist

Which information is collected that maps do not give?

Soil, geology, drainage, materials and local conditions

2081 Chaitra · 3 marks

Why reconnaissance survey is conducted

Short answer

It verifies map-study routes in the field, collecting data on soil, drainage, and land use not shown on maps. It eliminates infeasible routes early, saving time and cost before the detailed preliminary survey, while providing rough cost estimates and identifying key obstacles.

Explain why reconnaissance survey is conducted.

A reconnaissance survey is done to check in the field whether the routes chosen in the map study are really feasible.

To verify the map study: maps may be out of date and do not show new buildings, recent landslides, changes in river courses or soil conditions.
To collect data not available on maps: soil, geology, drainage, land use, materials and local conditions.
To eliminate bad routes and keep one to three promising routes for the costly preliminary survey, saving time and money.
To locate the obligatory points and the stream crossing positions.
To make approximate estimates of construction cost and compare the routes.
To get a general idea of the problems (hydrology, slope stability, land acquisition) before the detailed work.

✓ Answer checked by Claude Opus 5.5 (high effort)

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Why reconnaissance survey is conducted

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