Inspire : Public Works July Aug 2012
35 continue tHe conversAtion Have your say on this story. Go to http://goo.gl/kD9Cm to comment on this article. snApsHot oF Onkaparinga The City of Onkaparinga was formed on the 1 July 1997 from the amalgamation of the Valley and Noarlunga with part of the District Council of Willunga. located on the southern fringe of Adelaide, South Australia and named after Onkaparinga River. the largest lga in South Australia, Onkaparinga has an estimated population of 164,800 and is expected to grow by 40,000 over the next 20 years. it encompasses an area of 518 square kilometres and includes urban and rural communities. the council is headquartered in the Noarlunga Centre with area offices situated in Aberfoyle Park and Willunga. the city of Onkaparinga had the equivalent of 613 full time workers as of June 30 2011, including 33 externally funded positions. the 2011-12 budget incorporated $137.3 million of expenditure including $41.2 million on Major Projects, Projects and Capital Works and the Climate Change Response Fund. accuracy will improve over time. “while we run this data to inform the works program, we still do a confirmation out in the field,” he says. “we can use the data to run calculations to give us quantities of repairs and estimate how much needs to be done prior to refill.” that data can also help decide what type of reseal or repair is needed. for example, significant kerb misalignment highlighted in an area with reactive soils may trigger use of an asphalt overlay, rather than a spray seal. If significant pavement defects or cracking show up in the data, it could trigger a reconstruction project instead. with the time taken to iron out data modelling problems, it will probably be about four years between the initial collection of data and the next round. for the next few cycles, Conahan expects to collect the data ever y three years then, once they have established a baseline, the time frame could be pushed out to five years. “the only pitfall is data integrity,” he says. “if there is an error in the data and someone spots it, then they wonder how they can trust the rest of it. “but i don’t think i’ve ever seen a data set without at least one error, so you have to aim for a percentage and i think 75 per cent is pretty good first time around.” ••• Note: The views expressed in this article are those of Murray Conahan and not the City of onkaparinga. five Ways onkaparinga can use the data 1 To help officers explain road repair and resealing priorities to the community. 2 To enable the planning, prioritisation and costing of maintenance and capital works. 3To inform planners and workers of the types of treatment and material that are needed to fix a particular section of road. 4To enable asset managers to provide a factual business case to their Finance Department to support funding claims and equipment purchases. 5To enable asset managers to move toward a sustainable asset management approach to the management of their road network. five things to consider 1 Build a business case for the future management of your network. The additional money needed for more comprehensive data is well worth it, considering its value in capital and maintenance works planning. 2 Tailor the type of data collected to your region. 3 Have a comprehensive set of data collection guidelines to ensure data collection is consistent across the network. 4Ensure adequate time is allowed to audit the data and refine the data model. 5 Update asset data whenever repairs are undertaken. it’s great to be able to say we have a transparent process in place ... we don’t just do mrs jones’ road because she shouts the loudest.
Public Works Sept Oct 2012