Attachments 11.4 and 11.5 - City of Busselton

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LAND inSights ATTACHMENT A – DRAFT LEPS ITEM 11.5 COUNCIL 12/10/2011 Executive Summary 4 Water, Wetlands and Watercourses 4.1 Background Wetlands Wetlands are biologically productive systems that support a diverse array of plants and animals. They have also been identified as one of the key life support systems along with agricultural land and forests (Ramsar Convention Secretariat, 2007). It is estimated that a significant proportion of wetlands along the Swan Coastal Plain have been destroyed since European settlement. Some of the major impacts on wetlands as a result of human activity including vegetation clearing (on foreshore areas and within the catchment), pollution, water consumption, modification of water flow and encroaching development. Most wetlands present in the Shire are situated along Geographe Bay, although it should be noted that current wetland mapping does not extend across the entire Shire. The Busselton region also contains a series of watercourses and coastal wetlands that are hydraulically linked to Geographe Bay. Major features include the following: • Carbunup River • Mary Brook • Lennox River • Buayanup Drain • Vasse Diversion Drain • Vasse River • Sabina River • Abba River • Ludlow River • Toby Inlet • Broadwater Area • New River Area • Vasse & Wonnerup Estuaries • The Deadwater The Vasse-Wonnerup System is located to the east of the Busselton townsite and is listed as a Ramsar wetland. Historically, the waterbodies were estuarine basins which have been functioning as low-salinity lagoons since floodgates were installed (WAPC, 2005). The floodgates are used to help control the water levels in the Vasse and Wonnerup waterbodies. When the water levels rise above that of sea level, the floodgates open to release some water into the sea. In general, the water is fresh during winter and more saline during summer. During the summer months, the system also has high nutrient levels which results in algal blooms. This has public health implications and is damaging to the ecology of the system. The system boasts the largest regular breeding colony of Black Swans in the south-west. In fact, the ecology of the system satisfies two Ramsar criteria in relation to waterbirds: • it regularly supports 20,000 waterfowl (more than 20 000 waterbirds have regularly been counted, including occasions when this number has exceeded 33 000) and • it regularly supports 1% of the individuals in a population of one species or subspecies of waterbird (at least 1% of the Australian population of Black-winged Stilt Himantopus himantopus and at least 1% of the world population of Red-necked Avocet Recurvirostra novaehollandiae use the Vasse-Wonnerup System in most years. VER 1 – FINAL DRAFT Shire of Busselton Local Environmental Planning Strategy Report 3 – Objectives, Strategies and Actions November 2010 Page 30
LAND inSights ATTACHMENT A – DRAFT LEPS ITEM 11.5 COUNCIL 12/10/2011 Executive Summary (Department of Conservation and Land Management, 1990) Significant wetlands located to the west of the Vasse-Wonnerup Estuary consist of the New River and the Broadwater. These wetlands are low-lying and prone to flooding during the winter months. Wetlands in Western Australia are categorised based on their environmental qualities and use as Conservation, Resource Enhancement or Multiple Use. The evaluation categories are described in Table 6.1 Table 6.1 – Wetland Evaluation Categories Category General Description Management Objectives C – Conservation (incorporates EPA Bulletin 686 categories H and C) R - Resource enhancement (incorporates EPA Bulletin 686 categories O and R) Wetlands support a high level of ecological attributes and functions. Wetlands which may have been partially modified but still support substantial ecological attributes and functions. Highest priority wetlands. Objective is preservation of wetland attributes and functions through various mechanisms including: - reservation in national parks, Crown reserves and State owned land, - protection under Environmental Protection Policies, and - wetland covenanting by landowners. These are the most valuable wetlands and the Commission will oppose any activity that may lead to further loss or degradation. No development. Priority wetlands. Ultimate objective is for management, restoration protection towards improving their conservation value. These wetlands have the potential to be restored to conservation category. This can be achieved by restoring wetland structure, function and biodiversity. Protection is recommended through a number of mechanisms. M - Multiple use (aligned with EPA Bulletin 686 category M) Wetlands with few important ecological attributes and functions remaining. (Water and Rivers Commission, 2001) Use, development and management should be considered in the context of ecologically sustainable development and best management practice catchment planning through land care. Should be considered in strategic planning (e.g. drainage, town/land use planning). Watercourses There are several major rivers, numerous minor-perennial watercourses, and several inlets within the Shire. The most significant inlet is Toby Inlet, which is located approximately 4 kilometres from Dunsborough along the edge of Geographe Bay. The inlet itself is a narrow, linear estuarine lagoon running roughly parallel to the coast with two connections to the ocean at its western end. It is characterised by tidal movements during the summer months and an outflow of fresh water in the winter. VER 1 – FINAL DRAFT Shire of Busselton Local Environmental Planning Strategy Report 3 – Objectives, Strategies and Actions November 2010 Page 31
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Attachments 11.4 and 11.5 - City of Busselton

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