What Is Drainage Grade?

Drainage Grade Design

Drainage grade design must connect the contributing area to a suitable outlet. Selecting a numerical fall before checking the outlet can produce a surface that cannot discharge as intended.

Before moving material

Survey entry points, structures and the receiving level.

Receiving operation and checks

Inspect the constructed route and its transitions. Check invert continuity and controls at crossings.

This guide does not size drains or establish discharge permissions.

Surface Drainage Formation

Surface drainage formation gives runoff a connected route. Forming a depression without checking its outlet can simply relocate the ponding.

Before moving material

Identify catchment entry, the receiving outlet and levels along the route.

Receiving operation and checks

Stabilise the surface and inspect it during a suitable water event. Check continuous drainage through every join and crossing.

A grading pass does not size a drainage system or authorise discharge onto another property.

Sugar Cane Drainage & Grading

Sugar-cane grading must work with row layout, drainage and repeated harvest traffic. A surface correction should distinguish a temporary rut from a broader drainage restriction.

Before moving material

Identify row-end drains, traffic lines and the crop stage.

Receiving operation and checks

Restore the required track or crop-surface preparation. Inspect low traffic areas and drainage crossings.

Established cane and constrained access may require another method or timing.

Record the job inputs

Use this checklist to turn the scenario into a specific brief. Retain the design revision and agree who accepts each completed layer.

• Existing condition, extent and the reason for intervention
• Required finished purpose, receiving operation and acceptance criteria
• Material type, layer role, source, receiving area and volume state
• Reference levels, datum, survey method and issued design revision
• Available tractor, implement configuration, travel route and turning space
• Checks before work, stopping points and evidence retained at handover

Checklist ticks apply only while this page is open. Include the completed brief in your project records.

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