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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 2: Pre Development Coefficients of Runoff Catchment 2 5 10 20 100 A 0.60 0.67 0.70 0.74 0.84 3.2.3 Time of Concentration To calculate the time of concentration for the internal catchment the Friends Equation (tc = 0.333 0.2 (107nL )/S ) from QUDM has been applied for overland sheet flow with the remaining distance calculated as concentrated flow. Please refer to Table 3 for the calculated time of concentration. Table 3: Pre Development Time of Concentration Time of concentration Catchment Catchment Concentrated Catchment 2 Overland flow flow Area (m ) Properties Total tc Friend’s Equation QUDM Figure 4.09 Open Horton’s (n) = Space/parks – 0.045 A 5,014 Light cover L = 90 m n/a 12.50 min bushland / poor Slope = 4.38% grass cover t = 12.5 min 3.2.4 Design Flow Rates Design storm flow rates have been calculated for standard storms with an ARI of 2, 5, 10, 20, 50 and 100 years for the pre development case using design rainfall intensities from the Bureau of Meteorology Rainfall IFD Data System. The Rational Method (Q = 2.78 x 10-3 CIA) has been used to calculate the required design flow rates for the subject site. The calculated pre development peak flows for the subject site are presented in Table 4. Table 4: Catchment A - Pre Development Internal Catchment Peak Flow Rates Average Recurrence ARI 2 5 10 20 100 Interval Coefficient of Runoff C 0.60 0.67 0.70 0.74 0.84 Average Rainfall Intensity I 114.91 142.10 157.53 178.98 228.29 (mm/h) Area of Catchment (ha) A 0.501 0.501 0.501 0.501 0.501 3 Peak Flow Rate (m /s) Q 0.095 0.132 0.154 0.183 0.267 3.3 Post Development 3.3.1 Catchment Definition and Lawful Point of Discharge The post development scenario consists of three internal catchments that convey the stormwater to the south and west of the site. Catchment A will discharge into existing Council stormwater infrastructure on Eumundi Noosa Road on the western site boundary. Catchment B will discharge into existing Council stormwater infrastructure on Walter Hay Drive on the southern corner of the site. Catchment C will remain mostly unchanged due to the existing vegetation and will continue to discharge to Council stormwater infrastructure on Walter Hay Drive. These discharge points represent the Lawful Points of Discharge (LPOD) for the site. The post development catchment areas and lawful points of discharge are shown on the Odyssey Consulting Group, Post Development Catchment Plan (Ref: K4277/P006/D) included as Appendix D. K4277-0002-D 14 February 2019 Page 4 of 16
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