Water & Marine

Water & Marine

Reservoir capacity & sedimentation

Measure how much water a reservoir can hold and how its bed has changed.

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What you receive

  • Reservoir bed and bank model
  • Elevation–area–capacity tables and curves
  • Sedimentation/storage-change maps
  • Methods, historical comparison and uncertainty report
How we deliver

Scope & options

Reservoir capacity is derived from the surveyed terrain/bed surface through elevation–area–capacity relationships.

Sedimentation is a change measurement and therefore depends on a defensible earlier surface or design reference.

Depth volume is not sediment mass; mass requires density or material characterisation.

Explore 3 service variants

Storage-capacity assessment

Calculate storage against specified water levels.

Requires adequate bed and bank coverage.

Sedimentation and storage-loss comparison

Compare current and historical reservoir geometry.

Different survey methods, datums or incomplete historical records may limit conclusions.

Desiltation quantity support

Provide baseline and repeat measurements for desiltation.

Contract quantity acceptance is separate.

Useful to know

Terms, explained
Area-capacity curve
Relationship between reservoir elevation, surface area and stored volume.
Sedimentation
Accumulated material that changes bed level and usable storage.
Survey datum
The vertical reference to which water levels and bed elevations are tied.
Can you calculate silt volume without an older survey?

A reliable change estimate normally needs a defensible earlier bed or design reference. Without it, only a clearly qualified estimate or current capacity can be offered.

Do you survey only the water-covered area?

The survey often includes exposed banks and shoreline control where they affect capacity, sedimentation or operating-level analysis.

Is storage loss the same as sediment mass?

Surveying estimates volume change. Sediment mass or properties require appropriate sampling, density information and interpretation.

Does the survey certify dam safety?

It provides reservoir geometry and storage information. Structural, operational and statutory dam-safety assessments are different scopes.

Method & limitations

Combine submerged-bed and exposed-bank data in a common datum.

Build elevation–area–capacity relationships for the surveyed condition.

Compare historical data only after checking compatibility and uncertainty.

Requires adequate bed and bank coverage.

Different survey methods, datums or incomplete historical records may limit conclusions.

Contract quantity acceptance is separate.

Sources & references

Your project

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Reservoir capacity & sedimentation

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Help me ask
  • Which previous capacity table or survey should we compare against?
  • Do you need the exposed banks above the present water level?
  • How will uncertainty in the siltation estimate be shown?
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