Hydrographic Volume Calculations

Hydrographic Volume Calculations

Our clients are often surprised (one way or the other) by the results of Total Hydrographic’s volume calculations. It’s impossible to take an educated guess at how much water is in a reservoir or how much sediment has been removed during a dredging campaign. In this instance, guess work can lead to delays, additional expense and repetition of work.

Total Hydrographic can calculate accurate volumes for your projects from planning stage through to completion.

Dredging Volume Calculation

When are Volume Calculations Needed?

Total Hydrographic regularly conduct volume computations for:

  • Reservoir Capacities
  • Pre-Dredge Volumes
    1. Material to be dredged to achieve the desired design depth
    2. Capacity available within the spoil ground
  • Post-Dredge Volume
    1. Calculating how much material was removed by the dredge
    2. Volume of material dumped within the spoil ground
  • Silt, Sand or Vegetation Volumes – a calculation of material volume can be done by comparing two surfaces.

The Process

To undertake a volume computation a surface model is generated from the data set and then compared to another surface of choice. This surface could be a channel design surface that includes a declared channel depth, channel batters and an over dredge depth if required.

For capacity computations a surface is generated of the bottom of the asset and then the volume is computed to a relative water level (generally full capacity).

A third method for volume computations is to compare two different surfaces. This method is great for comparing a pre-dredge survey with a post-dredge survey or when monitoring reservoirs or beaches with highly dynamic materials. The result is a volume of material removed (or accumulated) which can be used to validate the initial contract.

Total Hydrographic’s volume calculations are conducted exclusively by professionally recognised Level 1 and Level 2 Certified Hydrographic Surveyors, assessed by the Australasian Hydrographic Surveyors Certification Panel (AHSCP) through the Surveying & Spatial Sciences Institute. 

Our staff have tertiary qualifications and experience in Hydrographic Surveying, Geomatic Engineering, Marine Mapping and GIS, Cartography and National Maritime Operations.

A list of certified professionals in hydrographic surveying can be found here.

If you have a project which requires you to know accurate quantities of water, sediment or dredging material then talk to Total Hydrographic. We can provide all the information you need to know to keep your project on track.

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