For all precincts: Western portal All Construction/ SW004 Provision of compensatory flood storage (approx. Operation SW006 Maintain existing flood plain storage capacity potentially 9,000 m3) SW008 impacted by the project, to the requirements and satisfaction SW012 of the responsible authority Provision of balancing storage (approx. 180 m3) SW013 Permanent and associated temporary construction works must Arden station SW017 not increase flood levels that result in an additional flood risk to Provision of compensatory flood storage during SW020 the requirements and satisfaction of the responsible authority construction (approx. 6,000 m3) SW021 Ensure permanent and associated temporary works do not Provision of compensatory flood storage during SW023 increase flow velocities that would potentially affect the operation (approx. 1,600 m3) SW026 stability of property, structures or assets, and/or result in SW028 Domain station erosion during operation or construction, to the requirements SW033 If necessary, provide appropriate combination of and satisfaction of the responsible authority SW034 barrier heights and flow diversion capacity to avoid Undertake modelling of the design of permanent and backing up flooding into Melbourne Grammar temporary works to demonstrate the resultant flood levels and during construction risk profile to the satisfaction of the responsible authority. Eastern portal Provision of balancing storage (approx. 60 m3) Fully integrate the stormwater treatment system into the design of Develop construction site environmental All Design/ AE001 Melbourne Metro for construction (all precincts) to ensure that management plans to contain and treat surface Construction stormwater entering a receiving water body complies with SEPP water runoff to meet agreed water quality (Waters of Victoria). standards The best practice performance objectives for achieving compliance with SEPP (Waters of Victoria) during the construction are described below:
For all precincts: Maintain existing flood plain storage capacity potentially impacted by the project, to the requirements and satisfaction of the responsible authority Permanent and associated temporary construction works must not increase flood levels that result in an additional flood risk to the requirements and satisfaction of the responsible authority Ensure permanent and associated temporary works do not increase flow velocities that would potentially affect the stability of property, structures or assets, and/or result in erosion during operation or construction, to the requirements and satisfaction of the responsible authority Undertake modelling of the design of permanent and temporary works to demonstrate the resultant flood levels and risk profile to the satisfaction of the responsible authority. Western portal Provision of compensatory flood storage (approx. 9,000 m3) Provision of balancing storage (approx. 180 m3) Arden station Provision of compensatory flood storage during construction (approx. 6,000 m3) Provision of compensatory flood storage during operation (approx. 1,600 m3) Domain station If necessary, provide appropriate combination of barrier heights and flow diversion capacity to avoid backing up flooding into Melbourne Grammar during construction Eastern portal Provision of balancing storage (approx. 60 m3) All Construction/ Operation SW004 SW006 SW008 SW012 SW013 SW017 SW020 SW021 SW023 SW026 SW028 SW033 SW034 Fully integrate the stormwater treatment system into the design of Melbourne Metro for construction (all precincts) to ensure that stormwater entering a receiving water body complies with SEPP (Waters of Victoria). The best practice performance objectives for achieving compliance with SEPP (Waters of Victoria) during the construction are described below: Develop construction site environmental management plans to contain and treat surface water runoff to meet agreed water quality standards All Design/ Construction AE001