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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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!
4 Detailed!Design!Documentation!
Detailed! design! documentation! has! been! prepared! by! TOD! Consulting! Engineers.!!
The! detailed! design! documentation! for! the! bioretention! systems! were! prepared! in!
accordance! with! the! “Bioretention! Technical! Design! Guidelines! –! Version! 1”!
(WaterbyDesign,!October!2012).!!!
Outlet! pipework! from! the! lower! bioretention! basin! and! Stormwater! Tank! is! to! be!
piped!below!RL!26!and!outlet!via!a!spreader.!!Calculation!of!level!spread!length!has!
been!undertaken!using!the!International!Erosion!Control!Association!Guidelines!and!
are!as!follows!in!Table!17.!
!
Table!17:!!Level!Spreader!Calculations!
!! Value! Reference!
100!yr!ARI!Peak!Flow!(m3/s)! 0.22!
!
Table!1!–!IESA!Level!Spreader!Fact!Sheet!
Max!Allowable!Discharge!Velocity!(m/s)! 0.9!
Poor!Soils;!>20%!grade!
Table!2!–!IESA!Level!Spreader!Fact!Sheet!
Sill!Length!(m!per!m3/s)! 19.4!
25%!grade!
Minimum!Calculated!Sill!Length!(m)! 4.3!
!
!
! !
! ! ! 22!
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