COWRA SHIRE BILLIMARI DROUGHT SECURITY 3 3 BORE PUMPS AND ASSOCIATED INFRASTRUCTURE

Cowra Shire Council has received funding to construct permanent water supply bores in Jumbuck Lane near Billimari in New South Wales and transfer water to Cowra River High Level Pump Station to provide an alternative water supply in case of future drought. The project consists of the construction two ground water bores to supply a reservoir and pump station for a proposed raw water main from Billimari to Cowra. The project was undertaken through funding made available through NSW Water Security for regions program.

Description of Works.

The Works under the project are for the construction of two high flow ground water bore pumps, DICL discharge manifolds and pipelines to reservoir and pump station to service the proposed raw water main from Billimari to Cowra. The Works include, but are not limited to:

Works Undertaken

Bore No 1 JNB Bore Pump & Manifold description.

We will Install the Submersible pump and motor that can supply a duty of 50l/s at 82mrts, this pump duty has been calculated as a worst-case scenario and with the Bore Level transducer fitted this pump can be slowed down to your required flow or increased to a maximum flow of around 65l/s.

The pump will be suspended on 152mm Crusader Flexible bore column which will have enough room outside the hose coupling to allow for the motor cable and level transducer to pass without causing any cable damage, bore column centralisers will be installed at the bore pump and the bore head to eliminate any possibility of cable rubbing on the bore casing, once the column leaves the ground there will be a Stainless Steel Bore Cap assembly as per photo supplied which will adapt to the 200mm Cast iron manifold as per drawing and photo supplied this manifold includes Air Valve assembly, Swing Check Valve, flushing Valve, dismantling joint and a NMI approved Water Meter before going back into the ground and connecting to the 250mm Series 2 PVC Mainline which will run to the Reservoir Tank, The Bore Head Manifold assembly will be supported by concrete plinths and Base Pad as per drawing and photo supplied.

Bore No 1 JNB Pump & Material list.

• Pump Type - Franklin 180FS10-3H 10” 3 Stage (316 Cast Stainless Steel)
• Pump Material - Cast Stainless Steel 316
• Number of Stages - 3
• Duty Point - 50l/s Head 82m (Performance Curve duty attached)
• Pump Efficiency -75.7%
• Motor - 55kw Full Stainless Steel 316
• Bore Column – 50mrts x 150mm Crusader Lay flat Pump column and Coupling connectors.
• Electrical Cable -60mrts x 50mm Shielded Rubber insulated Submersible Electrical drop Cable.
• 1 x Vega Bore Level Transducer
• 1 x 250mm Stainless Steel Bore Head assembly as per drawing supplied.
• 1 x 200mm Cast iron Manifold as per drawing supplied.
• 1 x Misc fittings that will be required to complete site installation.

Bore No 2 JSB Bore Pump & Manifold description.

We will Install the Submersible pump and motor that can supply a duty of 50l/s at 82mrts, this pump duty has been calculated as a worst-case scenario and with the Bore Level transducer fitted this pump can be slowed down to your required flow 35l/s or increased to a maximum flow of around 50l/s.

The pump will be suspended on 152mm Crusader Flexible bore column which will have enough room outside the hose coupling to allow for the motor cable and level transducer to pass without causing any cable damage, bore column centralisers will be installed at the bore pump and the bore head to eliminate any possibility of cable rubbing on the bore casing, once the column leaves the ground there will be a Stainless Steel Bore Cap assembly as per photo supplied which will adapt to the 200mm Cast iron manifold as per drawing and photo supplied this manifold includes Air Valve assembly, Swing Check Valve, flushing Valve, dismantling joint and a NMI approved Water Meter before going back into the ground and connecting to the 250mm Series 2 PVC Mainline which will run to the Reservoir Tank, The Bore Head Manifold assembly will be supported by concrete plinths and Base Pad as per drawing and photo supplied.

Bore No 2 JSB Pump & Material list.

• Pump Type - Franklin 180FS10-3H 10” 3 Stage (316 Cast Stainless Steel)
• Pump Material - Cast Stainless Steel 316
• Number of Stages - 3
• Duty Point - 50l/s Head 82m (Performance Curve duty attached)
• Pump Efficiency -75.7%
• Motor - 55kw Full Stainless Steel 316
• Bore Column – 50mrts x 150mm Crusader Lay flat Pump column and Coupling connectors.
• Electrical Cable -60mrts x 50mm Shielded Rubber insulated Submersible Electrical drop Cable.
• 1 x Vega Bore Level Transducer
• 1 x 250mm Stainless Steel Bore Head assembly
• 1 x 200mm Cast iron Manifold as per drawing supplied.
• 1 x Misc fittings that will be required to complete site installation.

Pump Electrical System

• Design supply and install Electrical Cable runs from both bore sites to the Electrical Switchboard including Pump Motor cabling Variable Speed Pump drives to interface with councils clear Scada control system to monitor bore water depths and current and cumulative flow rates to council WTP.
• The bore field pumps are 55 kW motors and will be VSD controlled, based on advice from Council it is understood that a maximum of two bore pumps are proposed, these have been incorporated into the MCC design including the ability of having both operating concurrently. The electrical design incorporates I/O for electrical instrumentation as identified in the functional specification including flow meters, pressure transducers and security reed switches at access doors. PLCs are to be used at the pumping station and the Cowra Council communications interface over Radio telemetry.
• Testing and Commissioning

Highlights, Innovations and Key Risks

Infield modifications to adapt to council requirements.

• Weekly wet weather compounded construction from the start of the project
• Ongoing discussions with council to improve the water supply system
• Long electrical cable runs form bore sites to boost pump reservoir site.
• No underground service strikes for the duration of the project
• Major Pump and Electrical construction in regional area
• All subcontractors on the project were local to the region