2014022_71_SeaviewTce_SWMP-revC_full · OPW16/0021

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Figure!3:!Conceptual!Water!Quality!Treatment!Train!


2.3 Modelling!Approach!
2.3.1 Philosophy!
As! discussed! above! a! conservative! approach! to! the! quantification! of! water! quality!
load! generation! and! treatment! as! a! result! of! the! proposed! living! ‘green’! roof! has!
been!adopted!for!this!investigation.!!The!areas!of!‘green’!roof!have!been!included!in!
the! MUSIC! model! as! forest! source! nodes! and! not! as! treatment! devices.! ! It! is!
proposed!that!the!roof!areas!be!planted!with!native!endemic!species!and!thus!will!
reflect! the! surrounding! forest! areas! rather! than! an! urban! garden.! The! ‘green’! roof!
areas! will,! in! fact,! provide! a! certain! level! of! water! quality! treatment! similar! to! a!
bioretention!garden;!however,!this!has!not!been!included!in!the!modelling.!!
Hydraulic! design! and! site! water! reuse! estimates! have! been! modified! from! the!
original! OPW! application.! ! The! currently! proposed! treatment! train! aims! to! address!
items!raised!in!the!NSC!RFI!(5!April!2016).!!The!proposed!treatment!train!differs!from!
both! the! previous! OPW! application! and! the! proposal! presented! in! the! superseded!
SWMP!(AquaIntel,!2014).!!As!such!the!MUSIC!model!has!been!amended.!!
In!order!to!quantify!load!reductions!a!base!case!(unmitigated)!assuming!the!building!
has!the!green!roof!areas!is!compared!to!mitigated!scenarios!including!the!inclusion!
of!reuse!estimates!and!treatment!devices.!!
2.3.2 MUSIC!Setup!
An! assessment! of! stormwater! runoff! quality! from! the! proposed! development! site!
has! been! conducted! using! the! Cooperative! Research! Centre! for! Catchment!
Hydrology’s! (CRCCH)! Model! for! Urban! Stormwater! Improvement! Conceptualisation!
(MUSIC).! MUSIC! is! a! decision! support! tool,! used! to! plan! and! design! appropriate!



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