Stormwater Management Plan

Good Shepherd Lutheran College                                                               Odyssey Consulting Group
Proposed Unit Development                                                     Conceptual Stormwater Management Plan
Lot 30 on SP170751                                                                                  Project No: K4277
115 EUMUNDI NOOSA ROAD, NOOSAVILLE




                                                                       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 plan
        Burling Brown Architects, Master Plan (Ref: SK-01) 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

3.2.1   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 ODC, Pre Development Catchment Plan
        (Ref: K4277/P005/A) in Appendix C.

3.2.2   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 4.05.3(a) the C10 coefficients of runoff was
        determined to be 0.70.

        With reference to QUDM Table 4.05.2, 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                                        14 March 2018                                          Page 3 of 16