Engineering Report · MCU18/0094

Existing Garnett Street Catchment:

Area: 33,476m2
Time of Concentration: 8.5min
Peak Flow (Q100/Q10): 2.15/1.39 m3/s


Additional Catchment from Subject Site:

Area: 375m2
Time of Concentration: 5min
Peak Flow (Q100/Q10): 0.028/0.019 m3/s


Combined Catchment:

Area: 33,851m2
Time of Concentration: 8.5min
Peak Flow (Q100/Q10): 2.17/1.41 m3/s


Peak Garnet Street Flow Increase:

(Q100/Q10): 1.3%/1.37%


Garnet Street Kerb Flow Capacity (Northern side):

Existing Catchment             Additional Catchment
Q10 = 0.065 m3/s               Q10 = 0.09 m3/s
d = 68mm                       d = 76mm
d*V = 0.14 m2/s                d*V = 0.17 m2/s < 0.4 m2/s (QUDM 2017 – Table 7.04.1)
Flow Width = 1.43m             Flow Width = 1.69m

Q100 = 0.095 m3/s              Q100 = 0.132 m3/s
d = 77mm                       d = 85mm
d*V = 0.15 m2/s                d*V = 0.17 m2/s < 0.4 m2/s (QUDM 2017 – Table 7.04.1)
Flow Width = 1.73m             Flow Width = 1.99m




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A6265 -18- Engineering Report – Garnet Street, Cooroy                       Page 4 of 4
Mar 2018    SH/tk
                                      Alta Projects P/L