Mt Martha STP – Hydraulic Capacity Assessment

Mt Martha Sewage Treatment Plant is a 13 ML/d activated sludge plant that serves approximately 65,000 people.  The plant includes channels, pipes, weirs, pits, tanks and associated infrastructure such as screens, pumps and mixers. 

CMP has undertaken a detailed hydraulic capacity assessment of every element in the treatment process to compare design flows with actual capacity.  This allowed the determination of any hydraulic bottlenecks that will require an upgrade to cope with future design flows.

The hydraulic capacity assessment included detailed open channel flow and pressure pipe modelling and involved site calibration for hydraulic accuracy.

Pakenham STP – Capacity Analysis and Plant Upgrade

Pakenham Sewage Treatment Plant is a 7 ML/d lagoon and activated sludge plant that serves approximately 30,000 people.  The plant includes lagoons, channels, pipes, weirs, pits, tanks and associated infrastructure such as screens, pumps and mixers. 

CMP has undertaken a detailed hydraulic capacity assessment of every element in the treatment process to compare design flows with actual capacity.  This allowed the determination of any hydraulic bottlenecks that will require an upgrade to cope with future design flows.

CMP has also undertaken detailed design of plant upgrades involving works on the inlet pump station, raw sewage screening, hydraulic transfer structures and pipes and activated sludge plant.

Avenue of Honour Sewer Pump Station and Rising Main

CMP completed the options investigation and detailed design and documentation of the 7.5km 375/450mm diameter Avenue of Honour rising main.  This included 2 No. bridge crossings, a railway crossing and non-destructive material testing of the existing main to determine is condition, surge analysis and service proofing.

CMP completed the options investigation, functional and detailed design of the 250L/s Avenue of Honour SPS Upgrade. This involved the complete replacement of all the pumping equipment and pipework, new pump station within the existing Emergency Storage Tank, monorail systems and electrics and controls.

Under a separate project, CMP also completed the concept and detailed design and contract administration of the 450mm diameter emergency relief pipeline and associated works for the Avenue of Honour emergency storage tank.

Coburns Road Trunk Main

CMP completed the functional, detailed and construction phase services for the Coburns Road water main, which is approximately 1.3km long and 600mm in diameter.  The pipeline includes a railway crossing and a crossing of a major road and has required cultural/heritage assessment, environmental assessments and significant consultation with Council, VicTrack and Western Water to ensure stakeholder requirements are met without compromising the project requirements or adding unnecessary cost to the project.

Rotary Park SPS Emergency Storage

CMP completed the detailed design and construction phase services for the Rotary Park Emergency Storage, which is currently nearing completion.  The Rotary Park Emergency Storage involves 280 kL of storage with allowance on site for a future 350 kL of storage if required in the future.  In addition to the Rotary Park Emergency Storage, we have also worked on the following emergency storages:

  • Pakenham STP Emergency Storage.
  • Wooralla Drive Emergency Storage.
  • Bailey Road SPS Upgrade and Emergency Storage.
  • University Hill SPS and Emergency Storage.
  • Mason Lane SPS and Emergency Storage.
  • Waterford SPS Emergency Storage.

Bacchus Marsh Recycled Water Plant Upgrade

CMP completed the options investigations, functional, detailed design and tender phase assistance for the Bacchus Marsh RWP.  This included an inlet works, screening equipment, 7.2ML Aerated Lagoon and associated pumping and pipelines, electrics and civil works. 

Waterford/Toolern Creek Development Servicing

A number of large developments are planned for Melton South, making it one of the largest development areas in Melbourne over the next 20 years. As such a servicing strategy was required to plan for the proposed 6000 future residential allotments. CMP undertook initial planning and functional design for the provision of water supply, sewerage and recycled water to the new development areas.  Following this CMP prepared the detailed design for these extensive trunk assets including:

  • 220L/s sewage pumping station
  • 700kL sewage emergency storage tank
  • 500mm diameter sewage rising main (1.7km long)
  • 300-450mm diameter branch and outfall sewers (4.6km long)
  • 450mm diameter potable water main (2.6km long)
  • 450mm diameter recycled water main including a bridge crossing (2.2km long)

Jacksons Hill Rising Main Extension

Western Water has experienced odour and corrosion issues resulting from septic sewage entering the Jacksons Hill Outfall Sewer.  The septic sewage results from long detention times in the Tame Street SPS rising main (flows from Diggers Rest) and the South Sunbury SPS rising main.  CMP has assisted Western Water with investigating and developing options to resolve these odour and corrosion issues.

CMP prepared the functional and detail design of the selected option. The works include approximately 1200m of new 500mm diameter PE rising main and gas check maintenance hole to separate septic pump station flows from the gravity system.  Following design, CMP managed the tender process and provided construction phase services. 

Western Water – Water Main Replacements

Our team were heavily involved in this ongoing project throughout the design, tender and construction phases.  The works involved the replacement of over 13km of 100mm and 150mm diameter water reticulation mains which required replacement to ensure system reliability and security.

This project required knowledge of stakeholder requirements across municipal and operational boundaries. During this project CMP developed strong connections with contractors, council representatives, Western Water project managers and operations staff to ensure successful outcomes despite a wide variety of challenges.

King Road WWTP – Recycled Water Storage

The King Road WWTP is one of Westernport Water’s main treatment plants which produces Class B recycled water which is used for local irrigation.  The existing 200ML effluent storage has not been sufficient to contain treated water within the site during recent wet years, and as such an additional storage lagoon is required.

CMP undertook the options investigation and functional design for the provision of an additional 400ML of effluent storage.  The selected option included the provision of a new 240ML storage lagoon combined with modifications to the existing lagoon to increase its capacity.

Sewage Spills Prevention Strategy

CMP has assisted Western Water with the development of the Sewage Spills Prevention Strategy (SSPS). 

Western Water’s sewerage system comprises approximately 1200km of sewer mains, 57 sewage pump stations, which pump into approximately 88km of rising mains. 

In response to the issue of sewage spills in Western Water’s system, a team has been established to carry out a thorough review of all available information and develop a strategy to reduce the risk, and number, of sewage spills and establish Western Water as a “Top 5” Water Business for this category. 

CMP has worked in collaboration with Western Water to develop and implement this strategy.

Western Water Asset Management Plans

CMP has completed Western Water’s Asset Management Plans for assets across the entire water, sewer and recycled water areas, including water mains and valves.  These AMPs address how the assets are managed and operated at Western Water, as well as states the specific design requirements for the particular assets at Western Water.  The specific Western Water design requirements include design requirements obtained from operational and maintenance experience. CMP collated this information working closely with Western Water’s field staff and Asset Manager.  We will use this experience gained on this project to deliver the best possible design which takes into account Western Water’s long term operational and maintenance needs. 

Contact Us


CMP Consulting Group
Level 1, 700 Springvale Road
Mulgrave VIC 3170

03 9002 0710


CMP Consulting Group
Level 10, World Trade Centre
18-38 Siddeley Street
Docklands VIC 3008