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RFI - Attachment 4 - Updated Stormwater Management Plan
Plans and drawings
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Log in to see the plans as drawnPeak Stormwater Discharge Calculations
Stormwater calculations were completed in accordance with the rational method explained in
Queensland Urban Drainage Manual (2017) and with reference to the site plans shown in
Appendix A.
Table C.1 – Total Site Peak Stormwater Discharge Calculations
Catchment tc (min) fi(%) AEP (%) C I (mm/h) A (m2) Q (l/s)
10 0.86 175 209
Existing Case 10 80 4999
100 1.03 250 358
10 0.87 175 210
Developed Case 10 83 4999
100 1.04 250 361
Tc = adopted time of concentration
Fi = fraction impervious
AEP = annual recurrence interval
C = coefficient of discharge
I = intensity
A = catchment area
Q = peak flow rate
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