Incorrect Fall — Surface Consequence
Define the finished purpose, reference levels, underlying material condition and the evidence required by the receiving operation. Geometry alone does not establish structural or agronomic performance.
This reference assembles relevant extracts from the guide library. It is general project planning, not a local project report, verified specification or translated technical publication.
Incorrect Fall
Fall is the change in elevation along a defined direction. An incorrect fall can include a reversal, an insufficient gradient or a gradient that differs from the design.
Before moving material
Identify the start and end points, distance and elevation reference.
Receiving operation and checks
Measure the corrected profile independently. Check intermediate points because correct end levels can still hide a local dip.
There is no universal drainage fall appropriate to every project.
Read the complete Incorrect Fall guideIncorrect 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.
Read the complete Incorrect Crossfall guideHow to Establish Fall Across Land
Fall across land is established by relating target elevations to measured horizontal distances. Set the required direction before choosing a gradient or moving soil.
Before moving material
Identify start, end and intermediate controls.
Receiving operation and checks
Measure the constructed surface independently. Check intermediate points and receiving outlets.
The example calculations on this site illustrate geometry, not universal design slopes.
Read the complete How to Establish Fall Across Land guideRecord 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.
Checklist ticks apply only while this page is open. Include the completed brief in your project records.
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