Section 1 - Summary of Your Proposed Action
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Submission #2210 - Vasse Diversion Drain Upgrade Title of Proposal - Vasse Diversion Drain Upgrade Section 1 - Summary of your proposed action Provide a summary of your proposed action, including any consultations undertaken. 1.1 Project Industry Type Transport - Water 1.2 Provide a detailed description of the proposed action, including all proposed activities. The Vasse Diversion Drain (VDD) is a 6 km manmade channel within the City of Busselton, in the south-west of Western Australia. The VDD commences just north of the Busselton Golf Course with the diversion headworks, in the form of a barrier levee (Vasse River Diversion Dam) and extends to the ocean at Geographe Bay. The purpose of the drain is to divert the Vasse and Sabina River toward the west of Busselton and provide flood protection for the town. The VDD was constructed in the 1920/30s using a steam driven dragline, as a rural drain. The material excavated from the drain was dumped as spoil banks on either side of the drain and were not engineered or constructed, nor required, to contain any drainage flow. These spoil banks have since “become” levee banks and are now required to contain the flow in the drain and function as “water retaining structures”. The section of the VDD downstream of the Queen Elizabeth Avenue Bridge has a concrete wall (lining) due to the high flow velocity of the drain. Since the original construction of the drain, residential (urbanised) areas have been developed on both sides of the VDD structure downstream of the Busselton Bypass. A project to upgrade the VDD was initiated in 2003, starting with a geotechnical and engineering assessment of the levees. This assessment concluded that the VDD is not capable of passing the 1% Annual Exceedance Probability (AEP) flood without a significant risk of a seepage induced failure of the levee banks. In order to reduce the societal risk associated with failure of the VDD, the Water Corporation proposes to reconstruct the Vasse River Diversion Dam (VRDD) including an overflow structure together with the full reconstruction and replacement of the existing levee banks along the length of the VDD with an engineered levee. The levee along the length of the VDD will be dug out in sections (e.g. 500 m long sections) down to the natural ground level, and reconstructed and compacted on a stable foundation using the original material. The dam structure will be dug down to the foundations and rebuilt. During reconstruction of the VRDD a coffer dam will be constructed upstream to divert flows into the lower Vasse River. The Shire of Busselton operates a slide gate that controls flows to the lower Vasse River. It is Submission #2210 - Vasse Diversion Drain Upgrade anticipated that the slide gate will be left open as required during the construction period to maximise flows that are diverted from the VDD to the lower Vasse River. 1.3 What is the extent and location of your proposed action? Use the polygon tool on the map below to mark the location of your proposed action. Area Point Latitude Longitude Vassed Diversion Drain 1 -33.686407273161 115.36436568891 Upgrade Vassed Diversion Drain 2 -33.685693085284 115.36556731855 Upgrade Vassed Diversion Drain 3 -33.686264436061 115.36629687941 Upgrade Vassed Diversion Drain 4 -33.686907201144 115.36608230268 Upgrade Vassed Diversion Drain 5 -33.687657087667 115.36573897993 Upgrade Vassed Diversion Drain 6 -33.688835467555 115.36573897993 Upgrade Vassed Diversion Drain 7 -33.68869263449 115.36449443495 Upgrade Vassed Diversion Drain 8 -33.690549445826 115.36423694288 Upgrade Vassed Diversion Drain 9 -33.690442323186 115.36380778944 Upgrade Vassed Diversion Drain 10 -33.686907201144 115.36415111219 Upgrade Vassed Diversion Drain 11 -33.686300145358 115.36333572065 Upgrade Vassed Diversion Drain 12 -33.685228859982 115.35951625502 Upgrade Vassed Diversion Drain 13 -33.684300401857 115.35840045607 Upgrade Vassed Diversion Drain 14 -33.682229189903 115.35664092695 Upgrade Vassed Diversion Drain 15 -33.680149000086 115.35477410948 Upgrade Vassed Diversion Drain 16 -33.676077757705 115.35099755918 Upgrade Vassed Diversion Drain 17 -33.674827365916 115.34954115697 Upgrade Vassed Diversion Drain 18 -33.67411308184 115.34645125219 Upgrade Submission #2210 - Vasse Diversion Drain Upgrade Area Point Latitude Longitude Vassed Diversion Drain 19 -33.672827355551 115.34490629979 Upgrade Vassed Diversion Drain 20 -33.669255792782 115.34095808812 Upgrade Vassed Diversion Drain 21 -33.66582695299 115.33512160131 Upgrade Vassed Diversion Drain 22 -33.664826848971 115.32945677587 Upgrade Vassed Diversion Drain 23 -33.664398229404 115.3269676859 Upgrade Vassed Diversion Drain 24 -33.664255355741 115.32576605626 Upgrade Vassed Diversion Drain 25 -33.663826733326 115.324736088 Upgrade Vassed Diversion Drain 26 -33.663255233451 115.32413527318 Upgrade Vassed Diversion Drain 27 -33.662040783611 115.32370611974 Upgrade Vassed Diversion Drain 28 -33.658483063261 115.32370611974 Upgrade Vassed Diversion Drain 29 -33.658483063261 115.32413527318 Upgrade Vassed Diversion Drain 30 -33.661626439941 115.32439276525 Upgrade Vassed Diversion Drain 31 -33.66305520956 115.324736088 Upgrade Vassed Diversion Drain 32 -33.663698148147 115.32585188695 Upgrade Vassed Diversion Drain 33 -33.66426964508 115.32997176 Upgrade Vassed Diversion Drain 34 -33.664841138216 115.33486410924 Upgrade Vassed Diversion Drain 35 -33.66512688336 115.33572241613 Upgrade Vassed Diversion Drain 36 -33.667269941688 115.33906981298 Upgrade Vassed Diversion Drain 37 -33.672698783827 115.3463654215 Upgrade Vassed Diversion Drain 38 -33.673698796319 115.34773871251 Upgrade Vassed Diversion Drain 39 -33.674127369541 115.34928366491 Upgrade Vassed Diversion Drain 40 -33.677663012769 115.35297438451 Upgrade Vassed Diversion Drain 41 -33.67907365987 115.35424038717 Upgrade Submission #2210 - Vasse Diversion Drain Upgrade Area Point Latitude Longitude Vassed Diversion Drain 42 -33.684287496383 115.35934731313 Upgrade Vassed Diversion Drain 43 -33.686215821563 115.36423966237 Upgrade Vassed Diversion Drain 44 -33.686407273161 115.36436568891 Upgrade 1.5 Provide a brief physical description of the property on which the proposed action will take place and the location of the proposed action (e.g. proximity to major towns, or for off-shore actions, shortest distance to mainland). The VDD is located in the City of Busselton approximately 220 km south of Perth, Western Australia. The drain is a constructed watercourse, which runs into the ocean at Geographe Bay. The development footprint for the proposed upgrade of the VDD encompasses a section of the existing VDD easement, approximately 5.6 km in length, commencing at the VRDD in the vicinity of the Busselton Golf Club where the drain joins the Vasse River and running northward to the northern side of New River (adjacent to the Queen Elizabeth Avenue bridge). The average width of the development footprint is approximately 70 m. 1.6 What is the size of the development footprint or work area? The total area of the development footprint is 39.62 ha, of which 6.34 ha is made up of the existing VDD channel. The total land 1.7 Is the proposed action a street address or lot? Lot 1.7.2 Describe the lot number and title.see attached 1.8 Primary Jurisdiction. Western Australia 1.9 Has the person proposing to take the action received any Australian Government grant funding to undertake this project? Submission #2210 - Vasse Diversion Drain Upgrade No 1.10 Is the proposed action subject to local government planning approval? No 1.11 Provide an estimated start and estimated end date for the proposed action. Start date 11/2017 End date 05/2018 1.12 Provide details of the context, planning framework and State and/or Local government requirements. The Water Corporation has been granted a State-wide Clearing Purpose Permit for Water Corporation Project activities and maintenance of existing water services infrastructure. The Water Corporation, under delegated authority, manages Clearing Permits under Part V of the Western Australian Environmental Protection Act 1986 (EP Act). If the project is referred under the EPBC Act and determined by the Minister of Environment as a controlled action, the Water Corporation cannot use their internal state wide clearing permit (Condition 2 iv), and a clearing permit through the Department of Environment and Regulation (DER) must be applied for. If agreed by both the Commonwealth and the Western Australia Government, the bilateral agreement assessment process is initiated. 1.13 Describe any public consultation that has been, is being or will be undertaken, including with Indigenous stakeholders. Not Applicable 1.14 Describe any environmental impact assessments that have been or will be carried out under Commonwealth, State or Territory legislation including relevant impacts of the project. Biological assessments of the VDD were undertaken in 2009, September 2016 and March 2017 (GHD 2010, 2017a, 2017b), which covered the area from the ocean outfall at Geographe Bay in the north to the VRDD in the vicinity of the Busselton Golf Course in the south. The potential long-term biological impacts associated with the proposal are linked to native vegetation clearing and loss of fauna habitat. Short-term impacts during the construction phase, such as reduced water quality or altered flow regimes within the drain, will be limited in duration and can be effectively managed through the implementation of appropriate controls and Submission #2210 - Vasse Diversion Drain Upgrade monitoring