Underground Utility Dictionary
Find field-ready definitions—fast.
Search and scan underground utility, excavation, and civil construction terminology with clear, practical definitions built for crews, estimators, and project teams.
How to use this dictionary
Built for quick lookups in the field and clear communication in plans, bids, and daily reports.
Search & scan
Find terms quickly and skim definitions without wading through jargon.
Field-ready definitions
Practical explanations focused on what the term means on the jobsite.
Cross-references
Related terms connect concepts (materials, methods, safety, and locating).
Suggest new terms
Help keep the dictionary current by submitting missing terms or better wording.
Browse A–Z (starter set)
A starter set of common underground utility terms. As the dictionary grows, this section can expand into full A–Z pages and dedicated term entries.
As-built
A record drawing or dataset showing what was actually installed in the field (locations, depths, sizes, materials), which may differ from the original design.
Bedding
Material placed under and around pipe/conduit to provide support, protect from point loads, and help maintain grade and alignment.
Daylighting
Exposing a buried utility by careful excavation (often vacuum excavation) to confirm exact location, depth, and orientation.
Hydrovac (vacuum excavation)
A non-destructive excavation method that uses pressurized water and a vacuum system to remove soil and expose utilities.
Locate / Markout
The process of identifying and marking underground utilities on the surface using paint/flags and records so excavation can proceed safely.
Trench box (shield)
A protective structure placed in an excavation to reduce the risk of cave-in and protect workers inside the trench.
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Missing a term? Send it in with your preferred definition and a real-world example. We’ll review and add it to the dictionary.