Stormwater Management Plan

       Main roofed areas from both buildings will drain to Rainwater
       Harvesting Tanks with captured runoff utilized for landscape
       irrigation. Tank overflow will be directed to catchment specific RIPs.
       Final tank locations and sizes are to be confirmed utilising a water
       balance model at OpWorks stage.

       Runoff from main landscaped areas will be intercepted and treated via
       landscaped swales prior to collection in pits and pipes and discharge to
       RIPs.

       Refer to Engineering Drawings at Appendix A for details.


              4.2.1 Emergency Overflow (>100year ARI events)

              Emergency overflow, for events (>Q100) which cannot be
              wholly infiltrated by RIPs, is to be directed toward the
              constructed wetland areas to the south as controlled sheet flow
              at velocities/depths which will not induce significant scouring.

              In order to achieve t
              bunded Rapid Infiltration with stone pitched weirs 12m long
              and at a constant height 0.2m below surrounding bunded areas
              to control emergency overflow.

              The rough nature of the stone pitching will also provide an




5.0

RIPs consist of a bottomless stormwater pit which promotes infiltration
through its base.


installed at the base of the RIP to protect against clogging of dune sands
below.

RIPs will be subject to routine inspection and maintenance by the
maintenance team and such maintenance is critical to their ongoing function.
(Refer Maintenance Schedule at Appendix B).


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A6769/22/SWMP/RevA      October 2022                                         Page 5 of 6
SH/PL
                         Brah101 Pty Ltd t/as ALTA PROJECTS