Levels survey
Setting Out · Phase 03 — Site analysis
Upload the levels plan
The base plan with the datum marked, every spot level annotated against it, and the scale and date on the sheet. A photograph of a hand-drawn sheet is fine if the numbers are legible.
Where your datum is, and what it physically is
Specific enough to find it again in two years — "galvanised nail in the north-east corner of the front porch slab", not "near the porch". Pick something that will not be dug up, paved over or moved.
The value you assigned to the datum
An assumed 100.000 m is standard practice and keeps every reading positive. Use AHD only if you levelled from a Landgate benchmark or a surveyor gave you one.
Grid spacing you used for the spot levels
Tighter on a small or broken block, wider on a flat one. Note it here so you know how much you are interpolating between points.
The spot levels
Every grid point, plus every door threshold, every boundary corner and every existing drain, pit or gully. Name each point so it matches the mark on your plan.
| Point | What it is | Staff reading (mm) | Level (m) |
|---|---|---|---|
The base plan with the levels marked on it
Scale, date, and where the drawing or file lives. Say how the datum and the levels are annotated on it.
What the levels told you about the block
Fall across the site in mm and as a percentage, which way it runs, the high and low points, and anything that surprised you.