Queensland Contour Banks

Designing Erosion Control Contour Banks with OptiLine

Farmer: Tristan Nitschke
Location: Queensland, Australia
Field Area: 310 ha or 766 acres
Irrigation Method: none
Crops: Wheat, Chickpeas, Cotton

The design worked perfectly, vastly expediting the the project of draining the contour banks and minimizing necessary earthworks.

Tristan Nitschke
Farmer, Queensland, Australia

Problem

The client was looking for a way to improve the drainage of existing contour banks on his field and add more to reduce the risk of erosion.

The Google Earth image below show where the existing contour banks are.

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Figure 1. Google Earth image showing the contour banks (left) and Existing Topography (right).

They surveyed the field and only covered where the contour banks will be. The alignments of the contour banks were designed by another consultant. However, due to inaccuracies during construction, the contour banks were not draining propoerly and ponding water.

The main requirement was to produce a control file for a GPS machine control system to follow so the contour banks can be constructed at the correct grade along the full length to eliminate any ponding.

Solution

The solution was to redraw the contour bank center lines (horizontal alignment) and calculate the elevation along the alignment using  the OptiLine feature as shown in Figure 2.

Figure 3 shows the long section along one of the contour banks after the OptiLine was calculated.

Then, the breakline was offset to create a surface for the machine control system to follow.

► Figure 2. The parameters used for the New OptiLine Feature (Design Breakline).

Figure 3. Long section of one of the contour banks.

Figure 4. Existing Topography (left) and Proposed Topography (right). Drag the slider left or right to view each.

Conclusion

The client was very happy and had this to say,

The design worked perfectly, vastly expediting the the project of draining the contour banks and minimizing necessary earthworks.

The design will also be very valuable in future bank and drain maintenance.


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