Washouts — What Not To Assume

Washouts

Washouts identify where runoff has removed material. Restoring levels without changing the erosive flow can produce the same failure again.

Before moving material

Inspect the upstream catchment, discharge route and remaining stability.

Receiving operation and checks

Re-establish and protect the surface with the appropriate stabilisation method. Inspect during later runoff and check the repair's edges.

Deep scour, unstable banks or structural damage may require specialist work.

Repeated Settlement Diagnosis

Repeated settlement suggests the problem may lie below the visible surface. Filling a depression again can hide a weak or poorly prepared layer.

Before moving material

Record the timing and extent of movement and review material history.

Receiving operation and checks

Repair the confirmed cause and re-establish the intended layers. Monitor the repaired area under the intended use.

A scraper guide cannot diagnose geotechnical failure from a photograph.

Why Water Returns After Grading

Water that returns to a repaired depression may indicate an unchanged outlet control, continuing inflow or settlement. Treat the recurrence as new evidence rather than simply repeat the same pass.

Before moving material

Compare the repaired levels with the drainage route and water observations.

Receiving operation and checks

Observe another suitable rainfall or irrigation event. Record where and when water reappears.

Subsurface and hydraulic causes may need specialist assessment.

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