The matrix volume calculation tool can be used in two ways: to calculate the difference in volume between

two matrices (for instance, pre-dredge and post-dredge), or between a matrix and a fixed level.

This last option can be used to calculate the area and volume of a pond or basin or tank.

In order to use this option for volume calculation, make sure you have converted

your corrected sounding to a matrix (see chapter "Generate matrix" ).

This tool calculates volumes by multiplying the difference between depth in matrix 1 and matrix 2 with the size of a single cell (Spacing).

In Hydromagic, the following conventions are used when calculating volumes:

Sounding data above the fixed reference or channel design is used to calculate the "above volume".

This is normally the amount of material that has to be dredged in order to get the channel design.

Sounding data below the fixed reference or channel design is used to calculate the "below volume".

This is normally the amount of material that has to be dumped in order to get the channel design.

In "depth mode" a value higher then the reference value is considered below.

Please note that in "elevation mode", when a vertical reference (datum) is used, it is the other way around.

In this case value's less then the reference value are used to calculate the below values.

The following image shows an example of a volume calculation (in "depth mode") with above and below values:

To start the matrix volume calculation tool, select the "Volumes (Matrix)" option from the "Tools" menu.

The following dialog will be shown:

Use this setting to specify the matrix created from your sounding, or when using two matrices, the matrix created from the post-dredge sounding.

Use this setting to specify the matrix created from your pre-dredge sounding or a matrix created from a 3D cad file or channel design.

In case you are calculate the volume of a basin or pond, select the "<Use Fixed Level>" option, and enter the level of the water surface.

When no tide correction is used, this value is 0.00.

Click the "Calculate" button to calculate area's and volumes from the selected matrices.

Calculated values are split in totals, above reference (Matrix 2) and below reference (Matrix 2).

This section will display the total area and volume for the whole sounding. The processed area means the amount of overlap between the two matrices used.

When a fixed level is used, the overlap is always 100% and the processed area will be the same as the total area.

Area and volume below the level found in Matrix 2 (see volume calculation conventions paragraph)

Area and volume above the level found in Matrix 2 (see volume calculation conventions paragraph)

Click the "Report" button to calculate area's and volumes from the selected matrices.

This function creates a PDF report containing the calculated areas and volumes.

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