Referenced Document - MCU30/0030 · MCU13/0030

                                   RAINWATER TANKS

ISSUES               PROCEDURES

                 ,

                                           Design Phase

Objective            Ensure that rainwater tanks have sufficient water capacity to supply potable
                     needs.

                     Ensure that stormwater storage tanks have sufficient water capacity to supply
                     non-potable needs.

Actions              The Consulting Engineer is to ensure that:

                           .   Tanks are sized in accordance with this Integrated Water Management
                               Plan.

                           .
                               Appropriate first flush diversion systems are installed on tanks
                           .   Rainwater tanks are installed with stainless steel mesh guards on any
                               inlet and exit points

                           .   Tank overflows are to a stabilised point to prevent erosion

                           .   Tanks are fitted with an appropriate top up system, to allow
                               supplementary potable water supply once tanks reach 10% capacity.
                               There should be a suitable ’air-gap’ provided between the top water
                               supply level in the tank and the supplementary supply to prevent
                               backflow.


Monitoring           Developer is to review the Works Plans and Building Plans.

Reporting            Works Plans and Building Plans are to be provided to consultants, developer
                     and contractor.


Incidents            The Rainwater Tanks are not approved according to submitted plans.


Corrective Actions   The Consultant will redesign the Rainwater Tank system to address any
                     concerns.


                     Major changes will require further Stormwater Quality Management Modelling.
             -   .
                                                                          "

                                       Construction Phase                                    ’.




Objective            The Contractor will install the Rainwater Tank system to ensure non potable
                     supply.



Actions              Builder to install tanks as part of construction and connect to the roof or
                     stormwater drainage system when the building and access roads / carparks
                     are   complete.
                           .   Builder to install tanks in accordance with manufacturer’s
                               specifications.
                           .   Plumber to connect tank in accordance with applicable
                               Plumbing/Building Codes.
                           .   Plumber to connect tank overflow to the Bioretention system or to a
                               location that that will not cause excessive erosion.




Monitoring           Council to review Plumbing application for tank installation from a certified