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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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Multi‐Pipe Outlet
Sizing of the scour rock protection for the proposed multiple pipe outlet was 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 pipe outlet.
Central Basin Overflows
Location
(2 x 1050)
Catchments B1, B2
Q (m3/s) 1.5
Area (m2) 1.7
Outlet Velocity (m/s) 0.87
Diameter (m) 1.05
No of Cells 2
Equivalent Diameter (m) 1.45
Multiplication Factor for Multiple Cells N/A
Length Ratio D:L 3
Width (m) 1.45
Length (m) 4.35
d50 (mm) 200
Thickness of Rock Protection (mm) 400
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