Works Approval Report.pdf - the National Capital Authority

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Campbell Section 5 - Works Approval Project Ref: 110029Prepared for the Land Development Agency1. PARK SYSTEMThis system takes water out of the main stormwater line that collects water from the 100hacatchment up to the War Memorial, (refer Appendix 5 for schematic design which forms thebasis for the design). The system treats the water in the following ways:A – Everyday low flows (approx. 1 l/sec – 250 l/sec) will be conveyed through the site in avegetated swale and detained in a bioswale wetland within the retarding basin.Microorganisms in the wetland will help to improve water quality. Water is to be extractedfrom the wetland and treated in the bridge abutment for reuse to irrigate landscaped areas.B – Storm flows will run through the wider swale before being stored in the retarding basin.This water will be filtered through vegetation and then released back into the stormwaterpipe network, ultimately discharging into Lake Burley Griffin.C – Flood flows will be retained on site protecting buildings and infrastructure. This water willbe filtered through vegetation, before being gradually discharged into Lake Burley Griffin.Examples of planted swales are shown in Figures 5.6 and 5.7.Figure 5.6 – Planted swaleNovember 2012 Cardno 26
Campbell Section 5 - Works Approval Project Ref: 110029Prepared for the Land Development AgencyFigure 5.7 – Swale as dry creek bed2. STREET SYSTEMD – Stormwater from the new street network will be harvested by rain gardens medians,areas of permeable paving, or piped into the retention basin. This water will be filteredthrough vegetation in the bioswale wetland before release into Lake Burley Griffin. Refer toAppendix 5 for a schematic that forms the basis for the design.3. BLOCK SYSTEM – BY SUB-DEVELOPERSE – Sub-developers of the Blocks will need to apply for NCA Works Approval and complywith the Building Code of Australia (BCA) incorporating sustainability into the design. It islikely that rain water captured from roofs will be stored within the blocks for reuse in toiletflushing, car washing, and watering of landscaped areas. These strategies to reuse roofwater are outside the scope of the Campbell Section 5 project and are included to illustratethe typical WSUD arrangements in a completed urban development. Some of theserequirements could be included under deed lease agreements for the sale of individualblocks.5.4 BiodiversityThe site currently consists of grouped plantings of Conifers and deciduous exotic trees clustered atthe edges; however, there is a limited range of species, with no locally indigenous speciesrepresented, and a mix of exotic weed and nuisance trees. Some native grassland is present butgenerally, the ground cover consists of exotic grassland weed species.The proposed park will support a range of specific planted environments, to increase biodiversityand habitat opportunity. Local indigenous trees, shrubs, grasses and wildflowers will be part of themix, forming an extension of ecologies present in Legacy Park and the hills beyond.November 2012 Cardno 27
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Works Approval Report.pdf - the National Capital Authority

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