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16-001014-02A (Ultimate SCMMP)
Attached to the e-mail Operational Works Application OPW16/0203 - 4 of 4.
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Bioretention Basin ‐ Energy Dissipater Calculations (Derived From QUDM, 2013)
Pipe Outlets
Sizing of the scour rock protection for pipes was determined using calculations specified in Section
8.7 of QUDM, 2013. Below indicates rock protection requirements and the adopted outlet rock
protection configuration at each pipe outlet.
Northern Bioretention Basin Outflow Central Bioretention Basin
Location
(375) Outflow (375)
Q (m3/s) 0.48 0.23
Area (m2) 0.1 0.1
Outlet Velocity (m/s) 4 2
Pipe Diameter 0.375 0.375
Multiple Cells? NO NO
Multiplication Factor for Multiple Cells N/A N/A
Length Ratio D:L 3 3
Width (m) 1.4 1.4
Length (m) 1.125 1.125
d50 (mm) 200 200
Thickness of Rock Protection (mm) 400 400
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