12d Takes to the Beach - Cardno

ClientCardno MBKLocationAustralia, Qld
ConsultantConsolidated Properties Pty LtdContractorRobbie Marshall

Project Summary

12d Model was integral to the success of the Casuarina Beach project, allowing Cardno MBK (CMBK) to meet extremely tight deadlines by reducing the huge variety of calculations required on a project of this magnitude. One of the last ‘absolute beachfront’ sites earmarked for development on the Northern NSW Coast, Casuarina Beach will ultimately be home to more than 5000 people.

The Challenge

The development is the project of Consolidated Properties Pty Ltd, a Brisbane-based firm primarily involved in commercial developments. The supply of all engineering and environmental services was contracted to Cardno. The joint project is being developed by CMBK’s Gold Coast office and its Environmental Unit.

The Gold Coast office was charged with completing the designs, obtaining all Tweed Council and Authority approvals, and supervision of the construction for the infrastructure of over 400 lots and tourist resort sites, to be ready for release by mid-2001.

To achieve these deadlines, CMBK had to rely on creativity and innovation, along with the integration of advanced technology with responsive management. CMBK had successfully used 12d Model for earthworks and civil design on the Seabreeze Estate subdivision at Pottsville. The company was then confident in selecting 12d Model for the Casuarina Beach development.

The Solution

As Civil Designer at CMBK, Robbie Marshall stated: “Software packages such as 12d greatly assist in meeting deadlines. The diversity and speed of 12d significantly reduced the huge variety of calculations required on a project of the magnitude of Casuarina.”

For the duration of the project, CMBK’s Gold Coast office was primarily involved in the engineering design of roadworks, drainage and trunk water mains; the design of over 4km of 200mm diameter sewer rising main; design and reporting on stormwater drainage systems for the overall development, adopting infiltration basins to complement piped and open channel drainage mechanisms; design of a sewerage reticulation system incorporating a regional pump station to benefit Casuarina Beach and adjacent developments.

The 12d Model modules catered for specific tasks involved in these functions, including such capabilities as the alignment module which uses cross-section templates and string design methods to produce roads, canals and other linear earthwork models. Cut and fill volumes are automatically produced for the design.

When adjustments are made to the alignment strings or templates, the 12d Model recalc option automatically removes invalid information and replaces it with the updated geometry and volumes.

According to Robbie Marshall, this is particularly useful when designing roads, swales, storage ponds or any situation where a number of trials are needed to determine the best position for final alignment. The drainage module supports the display of drainage networks, typically those required for new land subdivisions and development projects such as Casuarina Beach. The drainage string itself consists of manholes, joined by straight or curved pipes. Invert levels and pipe grades can be set or modified graphically or by typed input. Manhole and pipe sizes are also user definable.

Robbie explained that earthwork volumes for trenches can be calculated along the selected design line. “The bulk earthworks modelling for Casuarina was carried out using 12d,” he said. “It was an immense task over the 38-hectare site but was significantly simplified using the software.”

Use of the Volumetrics and TIN Analysis capabilities allows calculation of earthworks volumes within a user defined polygon using either end area or exact calculations. Reports of cut and fill areas and volumes are given on a section-by-section basis using the end area method or on a depth basis using prismodial volumes. Depth volumes can be colour coded for validation and plots.

The Result

The integration of these features has allowed CMBK to meet its selection criteria. Robbie explained that CMBK wanted to “increase productivity without reducing quality in the design and documentation of urban developments and civil infrastructure projects”.

Highlighting specific features which CMBK found particularly valuable, he cited the increase in speed of road designs due to the fact that preliminary designs could be simply recalculated with the use of template files; time saved using the kerb function; and the string-based design software which allows accurate finish profiles to be obtained.

He added that the software has good interaction with other packages and was easy to learn and to use, even for the non-computer literate.

Download this Case Study as a PDF HERE