---
title: "Importance of surveying to civil engineers"
subject: "Surveying I"
chapter: 1
key: "semester_3/surveying_i:importance-of-surveying"
source: https://www.bctengineer.com/q/semester_3/surveying_i/importance-of-surveying
site: BCT Engineering
---

# Importance of surveying to civil engineers

Surveying I · Chapter 1: Introduction

- Asked in: 2074 Asoj, 4 marks
- Video: [Importance of Surveying in Civil Engineering](https://www.youtube.com/watch?v=4civ6cyJtlQ) — Gurukul of Civil Engineers
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_3/surveying_i/importance-of-surveying
- Whole chapter: https://www.bctengineer.com/md/semester_3/surveying_i/chapter-1

## Question

Define surveying. Explain its importance to civil engineers.

## Short answer

Surveying is the art and science of determining point positions by measuring distances, angles and elevations, and plotting them. For civil engineers, it is essential for planning, design, quantity estimation, setting out structures, construction control, land acquisition, and monitoring, ensuring economical and accurate project execution.

## Answer

**Surveying** is the art and science of determining the relative positions of points on, above or below the earth's surface by measuring horizontal distances, angles and vertical distances, and plotting them to scale on a plan or map.

#### Importance to a civil engineer
Surveying is the first step of almost every civil engineering project.

1. **Planning and feasibility.** Topographic maps and contour plans help to choose the best site, route and alignment of roads, canals, railways, pipelines and transmission lines.
2. **Design.** Levels, sections and contours give the data to design earthwork, drainage, slopes and structures.
3. **Estimating.** Areas and volumes of cutting and filling, and quantities of materials, are calculated from survey data, so cost estimates depend on it.
4. **Setting out.** The designed centre lines, building corners, foundations, columns and levels are marked on the ground by surveying.
5. **Construction control.** Alignment, levels and verticality are checked during construction.
6. **Land matters.** Property boundaries, land acquisition and land records need cadastral surveys.
7. **Monitoring.** Settlement, deflection and movement of dams, bridges and tall buildings are measured by precise surveys.
8. **Water resources and hydropower** projects in Nepal depend on river, catchment and contour surveys.

Hence a civil engineer who knows surveying can plan economically, set out accurately and control quality.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. How does surveying help in the planning of a road or canal?
   A. It supplies the quality of cement
   B. It provides the traffic fines
   C. Topographic maps and contour plans help choose the best route and alignment
   D. It fixes the labour wages
   Answer: C. Topographic maps and contours guide the choice of site, route and alignment. (Key point: Planning)

2. Why do cost estimates depend on surveying?
   A. Areas and volumes of cutting and filling are calculated from survey data
   B. Surveying fixes the price of materials
   C. Surveying sets the contractor's profit
   D. Estimates use no measured data
   Answer: A. Earthwork quantities come from survey data and drive the cost estimate. (Key point: Estimating)

3. Why are precise surveys done on dams and bridges after construction?
   A. To find the mix proportions
   B. To measure settlement, deflection and movement
   C. To get the original plan
   D. To fix property boundaries
   Answer: B. Precise surveys monitor structural movement. (Key point: Monitoring)

4. Which survey is needed for property boundaries and land records?
   A. Hydrographic survey
   B. Astronomical survey
   C. Geological survey
   D. Cadastral survey
   Answer: D. Cadastral surveys deal with boundaries and land records. (Key point: Land matters)

## Related in Surveying I

- [Profile and cross-section levelling](https://www.bctengineer.com/question.md?key=semester_3%2Fsurveying_i%3Aprofile-and-cross-section-leveling) — Surveying I, chapter 5, asked 10×

## Related in other subjects

- [Importance and scope of civil engineering materials](https://www.bctengineer.com/question.md?key=semester_3%2Fcivil_engineering_materials%3Aimportance-scope-subject) — Civil Engineering Materials, chapter 1, asked 8×
- [Importance of engineering economics for engineers](https://www.bctengineer.com/question.md?key=semester_6%2Fengineering_economics%3Aimportance-ee-decision-making) — Engineering Economics, chapter 1, asked 2×