rock-fill dam
C1Technical / Professional
Definition
Meaning
A type of dam constructed primarily by dumping and compacting a large volume of rock or coarse, fragmented material.
A dam where the main structural support comes from a mass of rock or rock-like material, often with an impervious core or facing to prevent water seepage. It contrasts with dams made from concrete or earth fill.
Linguistics
Semantic Notes
The term specifically refers to the construction method and material. A 'rock-fill dam' is distinguished from a 'gravity dam' (concrete) and a 'simple earthfill dam'.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences; term is identical in both varieties. Hyphenation may occasionally vary ('rockfill dam' as one word).
Connotations
Technical neutrality in both contexts. No special connotations.
Frequency
Equally infrequent and specialised in both UK and US English, appearing almost exclusively in engineering, hydrology, and construction contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The [project] features a rock-fill dam.A rock-fill dam was constructed across the [river/valley].The [reservoir] is retained by a rock-fill dam.Vocabulary
Synonyms
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Rare; might appear in project proposals or infrastructure investment reports.
Academic
Common in civil engineering, geotechnical engineering, and water resource management journals and textbooks.
Everyday
Extremely rare. An everyday speaker would likely just say 'dam'.
Technical
Standard, precise term for a specific dam type. Used in design specs, construction documents, and technical discussions.
Examples
By Part of Speech
verb
British English
- The valley will be rock-filled to create the dam's core.
- They plan to rock-fill the embankment section next month.
American English
- The contractors will rock-fill the main structure this summer.
- The design calls for rock-filling the upstream zone.
adjective
British English
- The rock-fill dam design was chosen for its cost-effectiveness.
- They reviewed the rock-fill construction method.
American English
- The rock-fill dam project is ahead of schedule.
- A rock-fill dam approach was deemed most suitable.
Examples
By CEFR Level
- They built a big dam with rocks.
- The new dam is made from a huge pile of rocks.
- The engineers chose a rock-fill dam because it was cheaper than a concrete one.
- The rock-fill dam has a clay core to stop water leaking through.
- The stability analysis for the zoned rock-fill dam accounted for potential seismic activity in the region.
- Construction of the 150-meter-high rock-fill dam required quarrying over ten million cubic metres of material.
Learning
Memory Aids
Mnemonic
Think of a 'rock-fill' dam as a giant's pile of rocks blocking a valley, not a smooth concrete wall.
Conceptual Metaphor
A DAM IS A BARRIER; A ROCK-FILL DAM IS A BARRIER MADE OF AGGREGATED, COMPACTED PARTS.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid translating as "скальная плотина" (rock dam), which implies a dam made *of* solid rock. The correct technical term is "каменно-набросная плотина" or "плотина из каменной наброски", reflecting the 'fill' concept.
Common Mistakes
- Confusing it with a 'rock *foundation*' for a dam. The 'fill' refers to the construction material of the dam body itself.
- Using 'rock-fill dam' to describe any large dam made of stone or concrete.
- Incorrect hyphenation or spacing (rock fill dam, rockfill-dam).
Practice
Quiz
What is the primary construction material for a rock-fill dam?
FAQ
Frequently Asked Questions
No. While both are 'embankment dams', an earthfill dam uses finer materials like soil, clay, and sand. A rock-fill dam uses larger, coarser rock fragments.
Rock-fill dams can be more economical where suitable rock is abundant nearby. They can also be more flexible and better suited to certain foundation conditions.
No. A functional rock-fill dam always includes an impervious element, such as a central clay core, an upstream concrete face, or an asphalt membrane, to prevent seepage.
Notable examples include the Nurek Dam in Tajikistan (one of the world's tallest), the Mangla Dam in Pakistan, and the Chivor Dam in Colombia.