RFI - SWMP.pdf

         •      Implement management plan for landscaping propagation. Use stable organically bound
                fertilizers cultivated immediately prior to turf placement. Mulch over areas of exposed
                topsoil.
         •      Construction of silt fences during construction and maintained beyond completion of
                landscaping.
         •      Drain stormwater runoff through the Bio Basin.
         •      Capture roof runoff and store for re-use.



5.3.3    Proposed Treatment Measures



Following the water quality objectives for the site mentioned above, to ensure that on-site stormwater
management facilities can be economically maintained, it was deemed the most appropriate method for
treatment is the use of a small grass swale and an on-site bio-retention basin. Roof and surface runoff
will be collected by an internal drainage network and directed to the on on-site bio retention basin prior
to the lawful point of discharge.



5.3.4    Pollutant Modelling



The impact of the stormwater quality management strategy of runoff discharged from the site has been
assessed using the Pollutant Export Model, Model for Urban Stormwater Improvement
Conceptualisation (MUSIC).



For our model the proposed treatment train has been modelled: -



         1.     Roof water from buildings containing units 17-22 and unit 1 will be collected by a 15kL
                rainwater re-use tank with overflow to Eumundi Noosa Road kerb and channel. The
                rainwater tank will be re-used for landscaping irrigation only, to all common areas.


         2.     Roof water for the remainder of the proposed development will be collected by the
                internal drainage network to discharge into a small grassed swale directed to the bio
                retention basin for treatment.


SCG Consulting Engineers                    Page 13                                SCG Ref: 31131(SWMP)