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Appendix B - Amended Biome Consulting Response
Attached to the e-mail Amended Biome Report - stormwater in addition to Information Response - MCU170551 - 20 Trading Post Road Cooroy.msg.
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WQCP ‐ 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.
Central Bioretention Basin South Discharge into Central Pond Outlet into
Location
Outflow into Pond (375) Central Pond (900) Existing Swale (825)
Q (m3/s) 0.23 1.275 2.2
Area (m2) 0.1 0.6 0.5
Outlet Velocity (m/s) 2 2.0 4.1
Pipe Diameter 0.375 0.9 0.825
Multiple Cells? NO NO NO
Multiplication Factor for Multiple Cells N/A N/A N/A
Length Ratio D:L 3 3 5
Width (m) 1.4 2.6 3.1
Length (m) 1.125 2.7 4.125
d50 (mm) 200 200 300
Thickness of Rock Protection (mm) 400 400 600
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