---
title: "EG map versus geological map"
subject: "Engineering Geology II"
chapter: 1
key: "semester_4/engineering_geology_ii:eg-map-vs-geological-map"
source: https://www.bctengineer.com/q/semester_4/engineering_geology_ii/eg-map-vs-geological-map
site: BCT Engineering
---

# EG map versus geological map

Engineering Geology II · Chapter 1: Introduction to Engineering Geology

- Asked in: 2081 Chaitra, 1 marks
- Video: [G map #  geological Map](https://www.youtube.com/watch?v=B-W3PdD_u3U) — Nur Sir
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_4/engineering_geology_ii/eg-map-vs-geological-map
- Whole chapter: https://www.bctengineer.com/md/semester_4/engineering_geology_ii/chapter-1

## Question

Differentiate between engineering geological map and geological map.

## Short answer

A geological map shows rock distribution, age, and structure for geologists, while an engineering geological map shows geology classifed by engineering behaviour (strength, weathering, permeability) for civil engineers, including soil, water, hazards, and suitability zoning, usually at larger scale.

## Answer

| Point | Geological map | Engineering geological map |
|---|---|---|
| Purpose | Shows distribution of rocks, age and structure | Shows geology as it affects engineering works |
| Classification | By origin and age (stratigraphy) | By engineering behaviour (strength, weathering, permeability) |
| Content | Rock units, contacts, folds, faults | Also soil, groundwater, weathering, slope stability, hazards, borrow areas |
| Scale | Usually small to medium | Usually large scale for a site |
| Users | Geologists | Civil engineers and planners |
| Interpretation | Descriptive | Includes suitability zoning and recommendations |

## Check yourself

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

1. How are units classified on an engineering geological map compared with a geological map?
   A. Both by age only
   B. Engineering map by engineering behaviour; geological map by origin and age
   C. Engineering map by age; geological map by strength
   D. Both by colour
   Answer: B. Geological maps use origin and stratigraphic age, while engineering maps group ground by strength, weathering and permeability. (Key point: Classification basis)

2. Which extra content appears on an engineering geological map?
   A. Fossil lists
   B. Soil, groundwater, slope stability, hazards and borrow areas
   C. Only rock contacts
   D. Only fold axes
   Answer: B. Besides rock units and structure, it includes soil, groundwater, weathering, slope stability, hazards and borrow areas. (Key point: Content)

3. Who mainly uses engineering geological maps, and at what scale?
   A. Geologists, small scale
   B. Farmers, any scale
   C. Civil engineers and planners, usually large scale for a site
   D. Tourists, medium scale
   Answer: C. Engineering maps serve civil engineers and planners and are usually large scale for a site, with suitability zoning and recommendations. (Key point: Users and scale)

## Related in Engineering Geology II

- [Preparation and components of EG map](https://www.bctengineer.com/question.md?key=semester_4%2Fengineering_geology_ii%3Aeg-map-preparation) — Engineering Geology II, chapter 1, asked 9×
- [Types and uses of EG map](https://www.bctengineer.com/question.md?key=semester_4%2Fengineering_geology_ii%3Aeg-map-types-uses) — Engineering Geology II, chapter 1, asked 3×
- [Engineering geological problems of Siwalik zone](https://www.bctengineer.com/question.md?key=semester_4%2Fengineering_geology_ii%3Asiwalik-problems) — Engineering Geology II, chapter 2, asked 4×
- [Topographical and geological maps for materials](https://www.bctengineer.com/question.md?key=semester_4%2Fengineering_geology_ii%3Amaps-construction-materials) — Engineering Geology II, chapter 7, asked 7×
- [Detail stage of EG site investigation](https://www.bctengineer.com/question.md?key=semester_4%2Fengineering_geology_ii%3Adetail-stage-investigation) — Engineering Geology II, chapter 4
- [Geological factors for hydrogeological condition](https://www.bctengineer.com/question.md?key=semester_4%2Fengineering_geology_ii%3Ahydrogeological-condition-factors) — Engineering Geology II, chapter 3, asked 9×

## Related in other subjects

- [Engineering geological map and site investigation](https://www.bctengineer.com/question.md?key=semester_3%2Fengineering_geology_i%3Aengineering-geological-map-and-site) — Engineering Geology I, chapter 1, asked 3×
- [Primary versus secondary geological structures](https://www.bctengineer.com/question.md?key=semester_3%2Fengineering_geology_i%3Aprimary-versus-secondary-geological-structures) — Engineering Geology I, chapter 5, asked 4×
- [Engineering geological problems in tectonic divisions](https://www.bctengineer.com/question.md?key=semester_3%2Fengineering_geology_i%3Aengineering-geological-problems-in-tectonic) — Engineering Geology I, chapter 7, asked 2×
- [Engineering geology versus geology; disciplines](https://www.bctengineer.com/question.md?key=semester_3%2Fengineering_geology_i%3Aengineering-geology-versus-geology-disciplines) — Engineering Geology I, chapter 1, asked 2×