Attachment C - Stormwater Management Plan - 30-32 Doonella Street_SMP-revA_full (00016826)

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6 Conclusions!
It! can! be! seen! from! the! results,! presented! in! Table! 7! that! the! treatment! train!
proposed!for!the!development!site!achieves!the!performance!criteria!set!by!the!NSC.!!
Annual! Load! Reductions! of! Total! Suspended! Solids! (TSS),! Total! Phosphorus,! Total!
Nitrogen! (TN)! and! Gross! Pollutants! (GP)! between! the! Mitigated! and! Unmitigated!
Scenarios!have!been!achieved.!!
It!is!proposed!for!the!site!to!implement!a!detention!system!within!the!site!in!order!to!
achieve! Council’s! non"worsening! criteria.! ! Table! 14! provides! a! comparison! of! the!
peak!existing,!developed!and!mitigated!flows.!!It!can!be!seen!that!whilst!peaks!flows!
increase! under! the! developed! scenario,! the! modeled! mitigation! solutions! ensure!
non"worsening!is!achieved.!!
This! plan! demonstrates! that! effective! treatment! of! stormwater! at! the! proposed!
development! can! be! achieved! through! the! integration! of! Water! Sensitive! Urban!
Design! (WSUD)! principles.! ! Through! the! incorporation! of! a! rainwater! tank,!
bioretention!and!detention!system,!the!plan!successfully!demonstrates:!
•     Compliance!with!the!requirements!of!NSC’s!Load!Based!Objectives;!
•     Ecological!sustainability!in!terms!of!the!development’s!impact!upon!receiving!
      waters!and!the!viability!of!the!proposed!site!development;!!
•     Compliance!with!NSC!non"worsening!of!peak!flows!in!the!1,!2,!5,!10,!20,!50!and!
      100!year!ARI!storm!event;!and!
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