Example 11: Sweet Furrow

Last Updated: 21 February 2013          Used: OptiSurface Designer V1.3

Saves $51,000 in Earthworks

Introduction


Davco furrow irrigated sugarcane field saved over $50,000 in earthworks.

Location:  Field 7A, Davco Farming, Ayr, Queensland, Australia
Area:  120 ha or 302 ac
Irrigation:  Furrow irrigation
Crops:  Sugarcane
Other information:  Fully irrigated row cropping, generally sugar cane, surveyed on 40m grid.



*Vertical Exaggeration x100

Design Inputs


Surface Type Selection: OptiSurface 1D (Must drain in 1 Direction - eg down rows)

Minimum Allowable Downslope: 1:1600
Maximum Allowable Downslope: 1:800
Max. Allowable Downslope change: 1:2000
Minimum Allowable Cross-slope: 1:-250
Maximum Allowable Cross-slope: 1:250
Max. Allowable Cross-slope change: 1:2000
Cut/Fill Ratio: 1.2

Earthmoving Rate: $1.00 /m3


Results

Average Cut Depth: 0.07 m
Volume of Cut: 53,000 m3
Volume of Fill: 44,000 m3
Earthmoving Cut/ha: 444 m3/ha
Earthmoving Cost/ha: $444 /ha

Total Cost: $52,893

Surface Type Selection: Single Plane (Use plane of best fit)


Results

Average Cut Depth: 0.18 m
Volume of Cut: 113,000 m3
Volume of Fill: 94,000 m3
Earthmoving Cut/ha: 952 m3/ha
Earthmoving Cost/ha: $952 /ha

Total Cost: $113,000

Conclusion


The OptiSurface design reduces average cut depth by 60% and total earthworks cost by 53% compare to a traditional single plane design.



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