Approved Plans - MCU18-0097 · MCU18/0097

                 GOOD SHEPHERD LUTHERAN COLLEGE                                                            ODYSSEY CONSULTING GROUP
                 Lot 30 on SP170751                                                             Conceptual Stormwater Management Plan
                 115 Eumundi Noosa Road, Noosaville                                                                   Project No: K4277




                                                                                         Subject Site




                          Figure 2:      Aerial Photograph (modified from google maps.google.com.au)

                 2.2      Proposed Development
                          The proposed development involves construction of a sealed carpark. Refer to the attached plans
                          Burling Brown Architects, Carpark 1 (Ref: GSL06/SK03/P7), Carpark 2 (Ref: GSL06/SK04/P7) in
                          Appendix B.



                 3.0 SITE HYDROLOGY AND HYDRAULICS
                 3.1      Background
                          The following sections define the parameters of the sites hydraulics. The Rational Method has been
                          applied to define flow rates at and through the subject site.

                 3.2      Predevelopment

                          Catchment Definition and Lawful Point of Discharge
                          The pre development scenario consists of an internal and small external catchment and small external
                          catchment that conveys the stormwater to the south and west boundaries of the site where it
                          discharges to the nature strip and into existing roadside kerb and channel along Eumundi Noosa Road
                          and Walter Hay Drive, which represents the sites Lawful Point of Discharge (LPOD).

                          The pre development catchments and LPOD are shown on Odyssey Consulting Group, Pre
                          Development Catchment Plan (Ref: K4277/P005/B) in Appendix C.

                          Coefficient of Runoff
                          A coefficient of runoff (Cy) was calculated for the site in accordance with the fraction impervious
                          method from QUDM. A fraction impervious value of 0.00 was applied. With a 1 hour 10 year rainfall
                          of 72.3 mm/hr and with reference to QUDM Table 4.5.3(a) the C10 coefficients of runoff was
                          determined to be 0.70.

                          With reference to QUDM Table 4.5.2, by applying the frequency factors for the standard storms of 2,
                          5, 10, 20, 50 and 100 years result in the following pre development coefficients of runoff as shown in
                          Table 2.




                 K4277-0002-E                                         18 June 2019                                         Page 3 of 14
Document Set ID: 20894174
Version: 1, Version Date: 03/07/2019