AGENDA - Sunshine Coast Council

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Strategy and Planning Committee Agenda 16 February 2011 The revetment wall height is proposed at 1.75 metres Australian Height Datum which is marginally higher than the Highest Astronomical Tide including climate change at 2100. The revetment walls are designed to be inundated by local, regional and storm tide flooding. To achieve the required minimum fill level for building platforms of 2.95 metres Australian Height Datum, a 1:4 batter extending approximately 5 metres back from the revetment wall is required. Building platforms at 2.95 metres Australian Height Datum (including allowance of 0.8 metre for Climate Change in accordance with the South East Queensland Climate Change Management Plan) will be 0.2 metre above the peak 100 year Average Return Interval storm tide level at 2100, which is the flood event which results in the highest flood level at the site. LOCAL FLOODING In this report local flooding is referred to as the flooding which results from a peak flood event over the catchment area draining to the new lake. The source of this flooding is local stormwater discharging into the lake system. The assessment of local flooding does not consider the potential for increased tailwater levels due to coincident local flooding and a storm tide event. The revetment wall height is proposed at 1.75 metres Australian Height Datum. which is marginally higher than the Highest Astronomical Tide including climate change at 2100. The weir level is proposed to be 1.65 metres Australian Height Datum. With regard to local flooding at 2100 and including the drainage capacity of the penstocks the revetment walls will have a 3 year Average Return Interval immunity to flooding. The local 100 year Average Return Interval flood level in the lake at 2100 is estimated to be 2.0 metres Australian Height Datum which is substantially less than the 100 year Average Return Interval storm tide level at 2100. REGIONAL FLOODING In this report regional flooding is referred to as the flooding which results from a peak flood event over the Bells Creek catchment area. The assessment of regional flooding does not consider the potential for increased tailwater levels due to coincident regional flooding and a storm tide event. For the regional flood analysis a tailwater level equal to the Mean High Water Springs has been used which is equal to 0.58 metre Australian Height Datum which is substantially less than the 100 year Average Return Interval storm tide level at 2100 of 2.75 metres Australian Height Datum. The peak regional freshwater flood level predicted adjacent o the site is 1.19 metres Australian Height Datum. The regional flood analysis considers fresh water flooding only and shows that the proposed development does not result in any filling of the Bells Creek floodplain during a 100 year Average Return Interval freshwater flood event. If a coincident storm tide event at 2100 was considered at the same time as regional freshwater flooding then most of the subject site would inundated. STORM TIDE FLOODING Under current climate conditions the 100 year Average Return Interval storm tide level (including wave setup) at Golden Beach is 1.95 metres Australian Height Datum. The South East Queensland Regional Plan (2009-2031), Part D, Section 1.4 states that for land not already subject to development commitment a sea level rise of 0.8 metre Australian Height Datum by 2100 needs to be taken into account. The result is that the 100 year Average Return Interval storm tide level at Golden Beach at 2100 is 2.75 metres Australian Height Datum based purely on sea level rise. If the frequency and intensity of severe weather events such as east coast lows and tropical cyclones increases then this storm tide level will increase further. Page 60
Strategy and Planning Committee Agenda 16 February 2011 The 100 year Average Return Interval storm tide level at 2100 is, therefore, higher than both local and regional flood levels and is the critical event at the site. BRIBIE ISLAND BREAKTHROUGH Based on the results of the tidal prism review the proposed development will not result in an increase in the likelihood of a breakthrough in Bribie Island. <strong>Council</strong> has previously commissioned Aurecon to undertake a Risk Assessment Bribe Island Breakthrough Analysis. A number of risks have been identified for Golden Beach as a result of a breakthrough with the main one being increased tidal range and potentially increased shoreline erosion. Sea level rise and storm surge impacts at the proposed development are largely independent of a breakthrough on Bribie Island. The proposed development does not directly front the Pumicestone Passage and is proposed to be set back from Bells Creek so shoreline erosion is not critical in terms of its impact on the proposed development. In summary a breakthrough in Bribie Island will have little impact on the proposed development. Open Space and Community Facility considerations The Social Policy Branch has considered the open space and social infrastructure needs for Pelican Waters. Open Space Network The Open Space Strategy has identified a shortfall of sports grounds in the Pelican Waters locality and requires the provision of a district sportsground. The current Planning Scheme Policy requires an open space contribution of 10 hectares (approximately 5 ha for playing fields). In addition to this, the Caloundra South Planning Area Code requires 2 Village Parks, 1 Neighbourhood Park with playing fields, and 1 Neighbourhood Park for the subject land. Negotiations with the developer have established agreement on open space provisions, as shown Attachment 8 – Open Space Network and a sporting fields contribution of $4,367,864 in lieu of land. Community Facilities The Draft Social Infrastructure Strategy has confirmed the need for a community facility in the town centre of Pelican Waters. The community facility located within the town centre would encourage and strengthen the community hub within Pelican Waters. The Desired Standards of Service for social infrastructure recommends the provision of a local community centre (size approximately 6,000m 2 ) and a district community centre (size approximately 10,000m 2 ). Planning Scheme Policy No.11.24 requires 6,000m 2 of land or a community facility, which would be of an acceptable size. The applicant has agreed to the provision of 6,000m 2 land for community facilities to be provided within the Business District Precinct and will form an obligation contained within the infrastructure agreement. Traffic and Transport considerations Road Network EXTERNAL MAJOR ROAD NETWORK Vehicle movements between the external major road network and the proposed development are expected to mostly occur via Pelican Waters Boulevard to the Caloundra Road / Nicklin Way intersection, for travel to/from places further north and west, and via Pelican Waters Boulevard - Landsborough Parade - Park Place, for travel to/from Golden Beach and the Central Caloundra area. Page 61
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AGENDA - Sunshine Coast Council

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