CMP was engaged to undertake the detailed mechanical, civil and structural design for the upgrade of the TasWater’s Blackmans Bay Sewage Treatment Plant as part of the Kingborough Sewerage Project. The upgrade included:
Boundary Creek Stock Pipeline is a key project for Barwon Water, facilitating the supply of raw water to a number of landowners in the Yeodene region to supplement flows taken from Boundary Creek.
The project involved the concept and detailed design of 7 km of PE pipeline. This included a pressure reducing station at an offtake to the existing Barwon-Colac Raw Water Supply pipeline that could cope with large pressure variations, as well as flow control devices at each of the landowner connection points. CMP worked with Barwon Water’s project managers, survey team, environmental team, and a number of key stakeholders to deliver this project on time and within budget.
Barwon Water required assistance to undertake the detailed design and documentation for “Basin No. 5”, a 450 ML storage to be located upstream of Colac’s Water Treatment Plant (WTP). Colac Basin No. 5 will increase security of supply capacity for Barwon Water while reducing energy consumption by positioning the basin such that raw water will gravitate from the upstream source to the basin and WTP. The construction value of Colac Basin No. 5 was approximately $5 million.
There were several constraints at the site identified for Colac Basin No. 5, including:
Close collaboration with Barwon Water and Coffey Geosciences was undertaken to overcome these constraints and develop an innovative solution which would maintain functional requirements, meet customer preferences and maintain long term constructability and operability.
To mitigate groundwater problems, an underdrain system was developed and a sloped storage base was adopted to allow construction above the groundwater table. A permeable HDPE liner was used to avoid cracking when the storage operates at lower levels and a geosynthetic clay liner was used to avoid excessive seepage into the underlying sand lenses.
The storage outlet included a multi-level draw-off system to allow operators to draw raw water from the best quality “band” and inlet/outlet pipe-work was configured to allow the WTP operators to draw water from the new and/or existing basins while filling either or both of the storages.
The trunk sewer ventilation systems at North Weston and Crace were in need of upgrade to minimize the risk of odour issues for nearby residents, meet performance criteria for sewer ventilation, and to prevent corrosion.
CMP was engaged to undertake the detailed mechanical, electrical, civil and structural design of a new trunk sewer ventilation systems at the two sites as outlined below.
North Weston: Scope included:
Crace: Scope included:
CMP prepared a detailed design for the hypochlorite dosing facilities for installation in remote indigenous communities in the Northern Territory.
The design had to allow for pre-fabrication and transport to site as well as potential weather conditions once installed, including cyclones.
The dosing units were based on the equipment installation inside a standard 10ft shipping container with an awning being installed once on site. Chemical storage was in multiple 20 L containers which could be switched out as they were emptied.
Water storage and supply was identified as a critical component for the long-term security, sustainability and growth of the Mount Buller resort in summer and winter. CMP completed the functional and detailed design of the Mount Buller Water Storage facility. The facility will be used to provide water security for the township, improve firefighting capability and increase the resorts snow making capacity. The upgrade included:
The Pakenham STP upgrade for South East Water included the following works:
Due to mixing complexities and the particularly aggressive/difficult nature of the incoming sewage, specialised investigation and testing was undertaken including:
The additional design effort put in “up front” worked well, as South East Water was able to ensure project requirements were well documented and the system was easy and straight forward to initially commission.
Cost Savings: All significant upgrade components were analysed in detail over a range of options to determine the most appropriate option. The tank height and depth were optimised for capital and operational expenditure. The cost savings to South East Water were in excess of $1.5M.
South East Water’s Blind Bight Sewage Treatment Plant was upgraded from earthen lagoons to a mechanical IDEA treatment plant necessary to cater for the population growth in the Blind Bight, Tooradin and Warneet townships.
South East Water required assistance with the following:
The works included:
The innovative design and construction management approach provided the following benefits to the community:
CMP completed concept, functional and detailed design of the Pakenham Main SPS and Inlet Works upgrade to take the capacity from approximately 130 L/s to 415 L/s using the existing site.
This required a significant amount of detailed hydraulic analysis to determine the optimum screen velocities and determine how the capacity of the existing system could be significantly increased without the need to duplicate building footprints.