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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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Box Culvert or Multiple Pipe Outlets
Sizing of the scour rock protection for box culvert outlets were determined using calculations
specified in Section 10.4.15 of QUDM, 2013. Below indicates rock protection requirements and the
adopted outlet rock protection configuration at each culvert outlet.
Central Bioretention Basin Inflow (1500 Southern Bioretention Basin
Location
x 600) Inflow (2 x 750)
Q (m3/s) 1.67 2.08
Area (m2) 0.9 0.88
Outlet Velocity (m/s) 1.9 2.35
Diameter or Width (m) 1.5 0.75
Cell Height (m) 0.6 ‐
Multiple Cells? NO Yes
Length Ratio D:L 3 3
Width ‐ Equivalent Pipe Dia (m) 1.5 1.05
Length (m) 4.5 3.2
d50 (mm) 200 200
Thickness of Rock Protection (mm) 400 400
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