Uneven Subgrade — High-Low Mapping
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.
Uneven Subgrade
Uneven subgrade can create variable thickness in every layer above it. Correcting the surface is useful only if the underlying support is acceptable.
Before moving material
Identify soft areas and compare formation levels with design.
Receiving operation and checks
Complete compaction and specified acceptance checks. Check levels before base material conceals the subgrade.
A scraper does not replace proof testing or project-specific investigation.
Read the complete Uneven Subgrade guideHigh-to-Low Redistribution
High-to-low redistribution can reduce local quantity imbalance when the high area's material suits the low area's intended use. It should follow measured levels, not visual guesses.
Before moving material
Mark confirmed cut and fill areas and soil layers.
Receiving operation and checks
Prepare the placed material and recheck the profile. Compare productive-layer depth in both source and receiving zones.
Some low areas are designed drains and should not be filled.
Read the complete High-to-Low Redistribution guideHow to Move Soil From High Spots to Low Spots
Moving soil from high spots to low spots requires a measured surplus and a suitable receiving area. A low patch caused by weak support may need repair before fill.
Before moving material
Check source material and the low area's cause.
Receiving operation and checks
Prepare the receiving layer and restore the source surface. Check both final levels and soil-layer depth.
Avoid filling designed drains or mixing unsuitable subsoil into growing medium.
Read the complete How to Move Soil From High Spots to Low Spots 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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