Levels and grading plan
Setting Out · Phase 06 — Detailed design and documentation
Upload the grading plan
A scan or photo showing the datum, every finished level in mm, a fall arrow and gradient on each surface, and where each arrow terminates.
Where the marked-up plan lives, its scale and its date
For example "grading-plan-v2.pdf, 1:100 at A3, 12 March, datum = garage floor at RL 100.000".
Every finished surface: level, fall and where the water ends up
One row per surface. Levels in mm relative to your datum. Fall as a ratio or mm/m. "Towards the fence" is not a destination — name the soakwell, soakage bed, swale or connection.
| Surface | Finished level | Fall direction | Gradient | Drains to |
|---|---|---|---|---|
Every step location, with the riser arithmetic
Total rise ÷ number of risers = riser height, every one the same. Riser 115–190 mm, going 240–355 mm, 2R+G between 550 and 700 mm.
| Location | Total rise (mm) | Number of risers | Riser height (mm) | Going (mm) |
|---|---|---|---|---|
Total cut
Grid method, and remember to deduct the pavement build-up — about 175 mm under a paved terrace is spoil too.
Total fill
If cut and fill do not roughly balance, you are paying to cart sand one way or the other. Say which.
Confirm every surface drains somewhere legal
Nothing at the house — 50 mm fall over the first metre and slab clearance kept. Nothing over a boundary. Every arrow terminates at a device with real capacity.