Drainage Fall Calculator

Slope and Fall Calculator

Fall calculation converts a slope and distance into a change in elevation. It does not decide which slope the project requires. For example, 300 metres at 1 in 5,000 gives a geometric fall of 60 millimetres.

Before moving material

Choose the measurement direction and confirm the units.

Receiving operation and checks

Compare planned end levels and intermediate checks with the design. Check millimetres versus metres and whether the entered distance is horizontal.

The example is geometry only, not an irrigation or drainage design recommendation.

Global Land Grading Knowledge Centre

The knowledge centre connects four decisions: the finished purpose, the problem stopping it, the work needed to correct it, and the equipment that can perform that work. Start with the symptom or project rather than a machine name when the cause is uncertain.

Before moving material

Choose a design, application or equipment pathway.

Receiving operation and checks

Take a clear project brief to the person arranging design or rental. Compare the selected guide with the actual site conditions.

Country or town names do not establish a local branch, completed project or available rental machine.

Poor Surface Drainage

Poor surface drainage can result from a blocked outlet, a reversed fall, a damaged crossing or local depressions. Grading should follow the identified cause.

Before moving material

Trace water from its entry point to the receiving outlet.

Receiving operation and checks

Inspect the drainage route during a suitable water event. Check that the complete route remains connected through boundaries and crossings.

Surface grading cannot remedy every subsurface drainage problem.

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.

Continue through the network

Surface and verification · Applications and rental · Equipment and technology