Storm Water management plan · MCU12/0133.03

Noosa Council documents


                  Bligh Tanner Consulting Engineers                                                                   Page 9
                  Noosa Flexi Learning Centre Stormwater Management Plan
                  August 2012



                  3.1 Erosion and Sediment Control Strategy
                  Due to the site having a low erosion risk, a minor erosion and sediment control plan will be
                  submitted as part of the operational works application. A preliminary erosion and sediment
                  control strategy is outlined below:

                  Given the flat sandy nature of the site, and that soil disturbance will be minimised because
                  most structures will be built on raised stumps rather than slab-on-ground, the erosion and
                  sediment control strategy is expected to be quite straightforward and involve a combination
                  of:
                      • Careful staging of works and tightly controlled work-methods to minimize soil
                         disturbance (this is critical as the permeability of the soils needs to be maintained
                         post-construction)
                      • Temporary downpipes to minimize erosion
                      • Sediment fences
                      • Controlled vehicle access points

                  No sediment basins are planned.
                  3.2 Stormwater Treatment Strategy
                  The stormwater treatment strategy is closely linked to the architectural design for the site, in
                  particular, keeping the building footprints small and retaining large areas of greenspace, and
                  building on piers to maintain the ground level permeability of the site.

                  Roofwater will be harvested and used all non-potable uses. Estimating demands for a centre
                  of this nature is difficult, as attendance is highly variable, and there are atypical water uses
                  compared to conventional schools. For example clothes washing facilities are provided for
                  young people who may be homeless, and some of the learning activities could, from time to
                  time, be high water users.

                  Non potable demands estimates are outlined in Table 5 below.

                  Table 5 Estimation of non-potable demands from rainwater tanks
                    Use               Rate              Comment/Source
                    Toilets           10.5 l/p/day      50% of the demand for a high efficiency
                                                        toilet or houses (Water y Design 2010)
                    Washing           2.6 l/p/day       10% of the demand for a high efficiency
                    Machine                             washing machine (Water by Design 2010)
                    Occupancy         80 people
                    Total internal    0.94 kL/day
                    use
                    Irrigation rate   700 mm/yr for the Water by Design 2010
                                      turfed area
                    Irrigation Area   640 m²            Turfed area as per site plan
                    Total external    384 kL/yr
                    use




                                                                                                  Print Date: 2 March 2020, 2:19 PM