A pipe described as being “at this depth” leaves an important question unanswered: which part of the pipe? The internal bottom, the centre and the outside top are different positions. A film can avoid ambiguity by pointing to the reference before introducing the number.
Ocean Protect's stormwater terminology material identifies the invert as the lowest internal point and distinguishes pipe cover measured above the outside crown. These definitions help a buyer brief a clear section; they do not determine the required pipe level or cover for any project.
A section can establish the vocabulary quickly
Show a simple pipe cross-section with its wall visible. Identify the internal bottom for the invert and the outside top for the crown. Add the surrounding surface only when explaining cover. Introducing all the dimensions at once can make a straightforward distinction look like a calculation exercise.
The graphic should attach each leader line to the correct point. A label floating near the bottom of a pipe is less clear than one visibly connected to the internal surface. This small drafting decision can matter more than making the pipe look photorealistic.
Where the story concerns a connection along a route, a longitudinal section may be more useful than a circular cross-section. It can show the relevant invert relationship between two identified positions. Keep the ground surface distinct so the audience does not mistake changing cover for changing internal pipe level.
Decide what the number explains
An invert elevation can locate a pipe within a height reference. Cover describes a relationship between the pipe's outside top and an overlying surface. The film should not use one as a casual substitute for the other.
Ask the project team why the value matters to the story. If the point is simply that a connection sits below another feature, a checked relative section may be clearer than several absolute levels. If the precise value explains a documented coordination decision, retain its reference and units alongside the relevant label.
This is also a useful moment to distinguish a cover level marked on an access structure from the depth of material covering a pipe. Similar words can describe different references. Let the technical owner resolve the terminology before the script treats every “cover” label as the same thing.
A hypothetical buried connection
Imagine a contractor describing how a drainage connection fitted beneath an existing surface. The first graphic draws a dimension from that surface to the pipe centre and calls it cover. The number supplied by the project team refers to a different geometric relationship.
The buyer asks for a checked section with the endpoints explicitly marked. The film uses the invert relationship for the connection explanation and the correct surface-to-crown relationship only if cover is relevant. Construction footage identifies the location before it was buried; the section explains what the camera cannot now show.
The audience gains a useful understanding of the geometry without receiving installation instructions or a judgment about whether the arrangement is adequate.
During review, hide the labels and ask which points the dimension lines connect. Then restore the wording and check that it describes those same points. Discuss your project with Live Images if a buried connection needs a clearer film explanation.
Prepared with AI assistance for Live Images. Planning guidance is general; suitability and production scope must be agreed for your project.