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Solar Pump Installation Project

 

Gordon Gibson Nominees recently completed a contract for the Rural City of Wangaratta, to design, supply, install and commission five solar powered pumping and water storage systems, for drought relief purposes at strategic locations within the municipality.

The locations are not serviced by a mains power supply, and hence in order to provide locals with a reliable water source in times of drought and bushfire, the council constructed groundwater bores and GGN installed solar powered submersible pumps, fitting multiple tanks. A solar and battery powered pump was installed, to draw water from the storage tanks supplying overload standpipes, and CFA outlet connections.

The battery system allows water to be supplied at all times, without the requirement for high levels of sunlight. The standpipes have timed switches, to allow delivery at set volumes of water. The bore pumps were installed at depths up to 96m below ground level.

Beechworth Sewerage Upgrade – North East Water

 

Gordon Gibson Nominees completed a Preliminary Design for North East Water for a new main Sewage Pump Station and Sewage Transfer Pipeline.

The former gravity outfall pipeline ran through the Beechworth Historic Park and lacked capacity resulting in regular overflows of untreated wastewater to the environment.

The project involved the design and documentation of a new main Sewage Pump Station, Transfer Pipeline, Energy Dissipation Structure and Treatment Plant inlet works.

North East Water awarded a Design and Construct Contract for the project to Longford Civil and Longford Civil appointed Gordon Gibson Nominees to carry out the detail design of the project.

The Beechworth Sewerage Upgrade Project involved a number of complex issues that required innovative solutions.

These issues included:

  • Highly variable sewage inflows to the pump station due to ageing sewerage reticulation infrastructure suffering significant infiltration issues whereby wet weather flows are up to eight times the peak dry weather flow;
  • Insufficient capacity in the existing transfer pipeline to the treatment plant resulting in regular overflows to the adjacent environmentally sensitive Beechworth Historic Park, and EPA infringement notices for North East Water;
  • The originally proposed new pipeline route involved a long distance through a State Park, presenting environmental construction challenges;
  • The pipeline route involved a relatively high lift, presenting pumping challenges;
  • The pipeline route also involved a very large fall over the downstream end, resulting in very high static pressures at the outlet to the treatment plant;
  • These complexities required:
    • A complex pumping system with two sets of pumps and intricate controls, depending on inflows to the pump station;
    • Detailed hydraulic design of the transfer main which incorporated both a pumped (pressure) section, and a gravity section;
    • Design of an Energy Dissipation structure at the outlet due to the 160m difference in elevation;
    • Boring of the transfer main under the State Park (500mm in diameter for approximately 1000m at 50m depth) through granite;
  • We carried out detailed hydraulic analysis and modelling, particularly for the pumping system and the energy dissipation structure;
  • The long bore required detailed calculations to confirm the practicality of the concept and the required pipe material details.

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