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OPW16/0021- Operational Works Application 2 of 4
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!
4 Detailed!Design!Documentation!
Detailed!design!documentation!has!been!by!TOD!Consulting!Engineers.!The!detailed!
design!documentation!for!the!bioretention!systems!has!be!prepared!in!accordance!
with! the! “Bioretention! Technical! Design! Guidelines! –! Version! 1”! (WaterbyDesign,!
October!2012).!!!
!
Outlet! pipework! from! the! bioretention/detention! basin! is! to! be! piped! below! RL26!
and! outlet! via! a! spreader.! ! Calculation! of! level! spread! length! has! been! undertaken!
using! the! International! Erosion! Control! Association! Guidelines! and! are! as! follow! in!
Table!15.!!
!
Table!15:!!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!
!
!
! !
! ! ! 20!
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