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2014022_71_SeaviewTce_SWMP-revC_full · OPW16/0021
From the archive OPW16/0021- Response - Civil Plans. File date in the archive: 2016-05-16 04:05.
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!
#! Measured! from! top! of! Bioretention! Extended! Detention! zone.! Total! depth! of! combined!
bioretention!and!detention!storage!is!1!m!above!planted!filter!media.!
All! modeling! parameters! remain! consistent! between! the! developed! and! mitigated!
scenarios,! with! the! addition! of! the! stormwater! and! rainwater! tanks! and! detention!
basin.!
A! comparison! of! the! peak! flows! between! the! existing,! developed! and! mitigated!
scenarios! are! presented! below! in! Table! 15and! Table! 16.! ! It! can! be! seen! that! nonT
worsening!of!peak!flows!are!achieved!at!each!outlet!to!the!site.!!
!
Table!15:!!Comparison!of!WBNM!Outlet!Peak!Flows!–!Outlet!1!
Existing!Peak! Developed!Peak! Mitigated!Peak! Change!in!Peak!
! Flow!(m3/s)! Flow!(m3/s)! Flow!(m3/s)! Flow!(m3/s)!
2!year! 0.19! 0.19! 0.19! 0.00!
5!year! 0.24! 0.25! 0.24! 0.00!
10!year! 0.27! 0.28! 0.27! 0.00!
20!year! 0.31! 0.32! 0.31! 0.00!
50!year! 0.33! 0.33! 0.33! 0.00!
100!year! 0.37! 0.37! 0.36! T0.01!
!
!
Table!16:!!Comparison!of!WBNM!Outlet!Peak!Flows!–!Outlet!2!
Existing!Peak! Developed!Peak! Mitigated!Peak! Change!in!Peak!
! Flow!(m3/s)! Flow!(m3/s)! Flow!(m3/s)! Flow!(m3/s)!
2!year! 0.11! 0.13! 0.11! 0.00!
5!year! 0.15! 0.17! 0.15! 0.00!
10!year! 0.17! 0.19! 0.17! 0.00!
20!year! 0.20! 0.22! 0.20! 0.00!
50!year! 0.21! 0.23! 0.21! 0.00!
100!year! 0.23! 0.26! 0.23! 0.00!
!
! !
! ! ! 19!
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