Water

• 15% Water demand sourced from non-potable sources
• 15% Rainwater, stormwater, wastewater, groundwater or tunnel inflow water generated during construction & operations reused, recycled or reclaimed

Infrastructure projects require a significant amount of water for construction and operations. JHCPB’s Construction Water Reuse Strategy outlines the measures the Project will investigate to ensure water savings are realised during construction. Since the commencement of construction, the Project has sourced approximately 66% of the total potable consumption estimated for project delivery.

Key initiatives to reduce potable water use during construction include:

• Use of rainwater tanks in construction compounds for domestic purposes
• Use of non-potable water for earth compaction, wheel wash, belt wash and dust suppression
• Sharing of treated ground water between tunnelling works and civil sites
• Utilisation of polymer and remote-controlled sprinklers for dust suppression during construction

As part of detailed design, JHCPB have investigated and implemented the following initiatives to reduce water consumption during operations and replace potable sources with non-potable alternatives:

• Water Efficiency Labelling Scheme (WELS) tapware specified at operational buildings and public use facilities
• Rainwater harvest for domestic purposes at operational facilities
• Reduction of potable water consumption through the treatment of groundwater for irrigation and tunnel washing
• Specifying water efficient systems for fire deluge commissioning and specifying Dry-Flo® technology for commissioning

Commissioning on the Water Treatment Plant (WTP) at Site C took place in April 2020. Registers of tunnel water pumped to the WTP are kept and updated by tunnel construction teams. These registers are used by the Sustainability Team to track total water collected and reused by the Project. Performance against the Project targets is provided below:

Monthly volumes of potable and non-potable water being used on the Project PTD

Non-Potable Water Replacement Performance 2020-2021

Water Generated/Collected which is Reused-Performance 2020-2021