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Stormwater Management Plan
Attached to the e-mail MCU18/0097 - Response to Further Advice - Traffic and Stormwater - 115 Eumundi Noosa Rd, Noosaville.
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Log in to see the plans as drawnGOOD SHEPHERD LUTHERAN COLLEGE ODYSSEY CONSULTING GROUP Lot 30 on SP170751 Conceptual Stormwater Management Plan 115 Eumundi Noosa Road, Noosaville Project No: K4277 Table 8: Catchment A Post Development Peak Flow Rates Average Recurrence Interval ARI 2 5 10 20 100 Coefficient of Runoff C 0.72 0.81 0.85 0.89 1.00 Average Rainfall Intensity I 164 202 223 253 321 (mm/h) Area of Catchment (ha) A 0.357 0.357 0.357 0.357 0.357 3 Peak Flow Rate (m /s) Q 0.118 0.162 0.188 0.224 0.318 Table 9: Catchment B Post Development Peak Flow Rates Average Recurrence Interval ARI 2 5 10 20 100 Coefficient of Runoff C 0.75 0.84 0.88 0.92 1.00 Average Rainfall Intensity I 164 202 223 253 321 (mm/h) Area of Catchment (ha) A 0.118 0.118 0.118 0.118 0.118 3 Peak Flow Rate (m /s) Q 0.040 0.055 0.064 0.077 0.105 Table 10: Catchment C Post Development Flow Rates Average Recurrence Interval ARI 2 5 10 20 100 Coefficient of Runoff C 0.60 0.67 0.70 0.74 0.84 Average Rainfall Intensity I 164 202 223 253 321 (mm/h) Area of Catchment (ha) A 0.026 0.026 0.026 0.026 0.026 3 Peak Flow Rate (m /s) Q 0.007 0.010 0.011 0.013 0.019 3.4 External Catchments The subject site and the surrounding area were examined to determine if any external catchments will contribute to the subjected site. The size of external catchments has been determined based on ground contours, existing roads and existing stormwater infrastructure. An external catchment has been identified to the North of the subject site. The external catchment has been analysed to ensure drainage has been sufficiently sized to convey external flows. The rational method has been utilised to calculate the peak flow rates. The parameters adopted in the rational method have been selected to reflect the current use of the external catchment. 3.4.1 Catchment Definition One external catchment has been considered for analysis. External Catchment A has an area of 449 m² and currently discharges stormwater along the northern boundary of the subject site. The external catchment is shown on the Odyssey Consulting Group, External Catchment Plan (Ref: K4277/P011/C) included as Appendix E. 3.4.2 Coefficient of Runoff The coefficient of runoff (Cy) was determined based on the fraction impervious (f i) method as specified in QUDM. A fraction impervious value of 0.10 has been adopted in accordance with QUDM, Table 4.5.1 Fraction impervious vs development category. The adopted fraction impervious value 1 reflects the potential fully developed future land use. Using a one hour, ten year rainfall intensity ( I10) of 72.3 mm/hr, a C10 value of 0.70 has been adopted for External Catchment A. K4277-0002-D 14 February 2019 Page 6 of 16
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