Drainage Unit Rates

Drainage Unit Rates - The unit rates below were used in the 1 July 2009 Revaluation.

Asset Type Unit Rate
Absorption Trench $79.00/m
Box Culvert (1200mm x 1200mm) $2,014.40/m
Box Culvert (1200mm x 2000mm) $2,950.44/m
Box Culvert (1200mm x 300mm) $881.60/m
Box Culvert (1200mm x 450mm) $1,083.82/m
Box Culvert (1200mm x 600mm) $1,277.88/m
Box Culvert (1200mm x 750mm) $1,466.74/m
Box Culvert (1200mm x 900mm) $1,651.90/m
Box Culvert (225mm x 450mm) $557.05/m
Box Culvert (300mm x 1500mm) $984.02/m
Box Culvert (300mm x 150mm) $469.25/m
Box Culvert (300mm x 1800mm) $1,083.82/m
Box Culvert (300mm x 225mm) $506.39/m
Box Culvert (300mm x 400mm) $583.57/m
Box Culvert (300mm x 450mm) $604.18/m
Box Culvert (300mm x 750mm) $720.50/m
Box Culvert (300mm x 900mm) $775.50/m
Box Culvert (3600mm x 3600mm) $12,557.60/m
Box Culvert (375mm x 150mm) $488.28/m
Box Culvert (375mm x 225mm) $532.29/m
Box Culvert (375mm x 300mm) $573.07/m
Box Culvert (375mm x 600mm) $720.50/m
Box Culvert (450mm x 1200mm) $1,083.82/m
Box Culvert (450mm x 1800mm) $1,372.85/m
Box Culvert (450mm x 225mm) $557.05/m
Box Culvert (450mm x 300mm) $604.18/m
Box Culvert (450mm x 450mm) $692.34/m
Box Culvert (600mm x 225mm) $604.18/m
Box Culvert (600mm x 300mm) $663.64/m
Box Culvert (600mm x 450mm) $775.50/m
Box Culvert (750mm x 300mm) $701.78/m
Box Culvert (900mm x 3000mm) $3,237.12/m
Box Culvert (900mm x 300mm) $775.50/m
Box Culvert (900mm x 450mm) $933.19/m
Box Culvert (900mm x 600mm) $1,083.82/m
Box Culvert (900mm x 900mm) $1,372.85/m
Causeway $52.90/m
Causeway (375mm) $52.90/m
Causeway (450mm) $52.90/m
Causeway (450mm) $52.90/m
Causeway (600mm) $52.90/m
Lagoon $10.00/m
Low Flow Pipe $146.00/m
Natural Channel $10.00/m
Open Channel $53.00/m
Open Channel (2m) $53.00/m
Retention Basin $1,000.00/m
Retention Basin (35m) $1,000.00/m
Stormwater Pipe (100mm) $186.24/m
Stormwater Pipe (1050mm) $831.83/m
Stormwater Pipe (1200mm) $1,040.17/m
Stormwater Pipe (1350mm) $1,277.54/m
Stormwater Pipe (1500mm) $1,543.92/m
Stormwater Pipe (150mm) $191.19/m
Stormwater Pipe (1650mm) $1,839.33/m
Stormwater Pipe (1800mm) $2,163.76/m
Stormwater Pipe (1950mm) $2,517.22/m
Stormwater Pipe (2100mm) $2,899.68/m
Stormwater Pipe (225mm) $204.68/m
Stormwater Pipe (3000mm) $5,803.95/m
Stormwater Pipe (300mm) $225.41/m
Stormwater Pipe (375mm) $253.41/m
Stormwater Pipe (450mm) $288.65/m
Stormwater Pipe (525mm) $331.16/m
Stormwater Pipe (600mm) $380.92/m
Stormwater Pipe (675mm) $437.93/m
Stormwater Pipe (750mm) $502.20/m
Stormwater Pipe (825mm) $573.72/m
Stormwater Pipe (900mm) $652.50/m
Stormwater Pipe (975mm) $738.54/m

The unit rates are based on the cost of a small number of BRC drainage projects, the standard rates used by ACEAM to value the drainage network post amalgamation, and unit rates developed by Fraser Coast Regional Council. To try and smooth out inconsistencies that may have resulted from the infrequent use of the larger Box Culvert sizes, first cut unit rates were plotted against culvert area, and a best fit curve plotted.

The equation adopted was: Unit Rate = 0.000835 x Area² + 0.385 x Area + 350

In the graph below the blue dots represent individual unit rate data points, and the green line is the above equation.

Box-Culvert-Graph.png

A similar technique was used to smooth out variations in the unit costs of stormwater pipes. This yielded the equation.

Unit Rate = 0.000645*Diameter² -0.062*Diameter +186

1-July-2009-Stormwater-Pipe-Unit-Rates.png
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