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OPW16/0021- Operational Works Application 2 of 4
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Table!5:!Bioretention!Basin!Design!Parameters!
Parameter! Bio1!
Extended!Detention!Depth!(m)! 0.3!
Storage!Surface!Area!(m2)! 5!
2
Filter!Media!Area!(m )! 5!
Unlined!Filter!Media!Perimeter!(m)! 0.01!
Saturated!Hydraulic!Conductivity!
200!
(mm/hr)!
Filter!Depth!(m)! 0.4!
TN!Content!of!Filter!Media!(mg/kg)! 800!
Orthophosphate!Content!of!Filter!
55!
Media!(mg/kg)!
Exfiltration!Rate!(mm/hr)! 0.0!
Overflow!Weir!Length!(m)! 5.0!
2.4.3 Sediment!Forebays!
Due! to! the! size! (<2ha)! and! nature! of! the! development! sediment! forebays! are! not!
required.! Bioretention! areas! should! be! monitored! to! ensure! that! the! deposition! of!
coarse!sediment!on!the!filter!media!surface!does!not!affect!the!bioretention!system!
function.!!
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! ! ! 11!
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