Field Calibration Services
Coliban Water Greater Bendigo
Commencing this project towards the end of December 2014 our technicians installed the equipment and completed all pretesting and synchronising in advance of the agreed test period to ensure milestones were going to be met. The project was successfully completed by early March 2015 without any problems or delays. The scheme required us to install, download and manage the data for in excess of 130 sites including flow, pressure and levels within the network to collect the short interval data to enable the model to be accurately calibrated and simulate actual field conditions. During the test period many hot days were experienced to provide a suitable calibration period.
Our brief was to provide pressure and flow data for the calibration of the network model. Data loggers were installed at specified points within the Greater Bendigo Area to provide accurate operational data for the duration of the monitoring period. Loggers were installed on selected bulk meters, customer meters and hydrants within the area being tested and the information downloaded at specified times during the deployment which was checked and verified by our data management team.
All sites were inspected prior to commencing work for suitability of installing equipment and, where inappropriate, consultation with the client for alternative sites prior to commencing work. A risk assessment was completed at this time.
During the installation process, our technicians completed an installation report noting all details of the site, installed equipment and current pressure and flows depending on the site. All equipment was synchronised to the client’s Scada system to ensure the data could be cross referenced with the additional information taken from their Scada system and used in the model. A photographic record was also included on the field report.
Data was checked after 48 hours to ensure all equipment was working correctly prior to commencing the actual field monitoring exercise. In addition, data was downloaded at agreed periods during the monitoring period which was checked and validated before passing onto our client.
AHD survey points were taken using an advanced GPS level system where pressure was being recorded or temporary insertion meters were installed. Each survey point was taken using 1 minute observations or 60 individual observations. The unit was set to record only fixed position solutions, therefore eliminating erroneous readings. In the few cases where the GPS signal did not provide an accurate fix, a temporary point was taken and then a conventional Dumpy level and staff method was used to arrive at final reduced level of the required location. All co-ordinates were referenced to MGA Zone 55 and elevations were corrected with AUSGeiod09 files as supplied by GeoScience Australia. To improve on elevation accuracy, a daily check was taken at a known survey reference point at one or two locations, (permanent survey marks) within the local area. An average offset of the difference between the GPS value and the reference mark value was applied to each survey point. The data management team checked all HGL profiles and reviewed the pressure profiles to confirm, as far as possible, that the data appeared to be of good quality.
The project progressed well and good quality data was collected for the hottest day of the summer, although the logging period had to be extended by a further week.
It was good to work with the Coliban Water team and, on those occasions where assistance was required, they were on hand to advise. As a result of this close working relationship, the project ran smoothly and completed on schedule.