ESD Landscape Contractors
The rehabilitation works at Elizabeth Hills are aimed to improve biodiversity and ecological processes in Hinchinbrook Creek. After a period of time it is hoped that there will be an increase in abundance and diversity of biota in the water of the macroinvertebrate family groups.
Water quality should improve to allow establishment of species that are more sensitive, such as those rated higher in the Australian pollution sensitivity grades. This in turn may aid in providing necessary links in the food webs for other threatened species. In this project, stormwater is managed by natural systems and provides beautiful amenity to increase property values. When properties were put on the market they were all sold in a few hours due to the riparian aesthetic value.
Gregory Hills will be the second project site visted on this Technical Tour. Further information on this site will be made available in the coming days.
A stormwater management strategy was developed to ensure that the proposed development adequately considered and managed flooding within local tributaries and main reaches of South Creek. The proposal included small detention storages associated with water quality improvements that mitigated erosion and ensured ecologically sustainable creeks throughout the site. Larger detention storages were proposed to ensure that flooding in South Creek does not worsen as a result of the development. The stormwater strategy included the hydrological and hydraulic modelling of over 300,000m3 of detention storage.
In early 2007 a Development Proposal for the proposed augmentation and extension of The Harrington Parkway, a proposed Community/Country Club, and the area covering Campbell Creek (and Tributaries 2 and 3), upstream of the existing Harrington Park residential environs. The stormwater management strategy proposed for The Campbell Creek Rehabilitation and Stabilisation Works project site is functional; delivers the required technical performance; avoids environmental degradation and pressure on downstream ecosystems and infrastructure; and provides for a 'soft' sustainable solution for stormwater management within the catchment.
Once the rehabilitated, and relocated creek and trunk drainage corridor as detailed herein, will lend not only aesthetic benefits to the overall Precinct, but also provide opportunities for development of biodiversity, critical habitat, (both floral and faunal), whilst still maintaining a sound mechanism for conveyance of critical storm flows. It is envisioned that after final completion and stabilisation of the reprofiled banks with the nominated revegetation treatments the banks will serve to form an effective riparian and wildlife connectivity corridor throughout the remediated creek precinct and will serve to mimic a natural creek corridor in form and function.
On rural land at Grasmere west of Camden, two developers proposed adjoining residential subdivisions. The first adopted a GPT and wetland basin approach to managing stormwater quality and quantity. The second, Bamburgh Properties, adopted a WSUD-style approach. Bamburgh Properties needed to incorporate two existing farm dams and the subdivision was designed with these as a community and environmental feature. The treatment train comprised pit trap GPTs and two Hydrocon bioretention basins.
This site is interesting to compare the two adopted approaches in relation to land take, aesthetics, maintenance and monitoring. The WSUD approach highlights the importance of timing in relation to connecting up bioretention systems, and of sediment control during construction. The WSUD system has been handed over to Camden Council with water quality and environmental values monitoring showing that it is particularly robust.