Crossfall Difference — Survey Data Required

Incorrect Crossfall

Crossfall controls the change in level across a road, path or other surface. A correct centreline does not prove that the edges drain correctly.

Before moving material

Measure the cross-section at the affected location.

Receiving operation and checks

Check the corrected section and the neighbouring transition sections. Verify both edges and any gutter or drain connection.

Do not infer a road crossfall specification from a generic illustration.

Rough Earthworks

Rough earthworks may still contain broad quantity errors, loose fill and unresolved drainage. Fine trimming should begin only after the larger formation is understood.

Before moving material

Survey the bulk surface and identify unsuitable or unaccepted areas.

Receiving operation and checks

Verify the corrected formation before the next layer. Check areas where bulk machines turned, stockpiled or discharged material.

A finish pass cannot establish the suitability of buried fill.

Surveying for Land Grading

Surveying for grading establishes the relationship between the site and the intended surface. Machine guidance can assist work, but the survey determines the reference against which results are checked.

Before moving material

Define the survey area, control and required deliverables.

Receiving operation and checks

Use the survey to prepare the design and later acceptance checks. Retain the datum, units and control-point descriptions.

A topographic survey and a legal boundary survey serve different purposes.

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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