Manly Lagoon Dredging Project - Manly Council - NSW Government
Manly Lagoon Dredging Project - Manly Council - NSW Government Manly Lagoon Dredging Project - Manly Council - NSW Government
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah CouncilsFollowing submission of this report the determining authorities must consider: Whether the proposed works are likely to have a significant impact on theenvironment such that an Environmental Impact Statement (EIS) under Section 112of the EP&A Act would be required; Any possible impacts on threatened species as defined by the TSC Act or FM Act,and review any Assessment of Significance (Seven Part Test) or a Species ImpactStatement (SIS) prepared in accordance with Section 5A of the EP&A Act; Any potential impacts on any Aboriginal or non-Aboriginal heritage items as definedby the NPW Act and the Heritage Act 1977; and The potential for the proposal to impact on any matter of national environmentalsignificance or Commonwealth land that would require referral to the CommonwealthDepartment of the Environment, Water, Heritage and the Arts (DEWHA) as towhether assessment and approval is required under the EPBC Act.1.2 BackgroundManly Lagoon is a small shallow coastal lagoon in Sydney’s Northern Beaches area,approximately 12km north-east of the Sydney Central Business District. The Lagoon islocated along the boundary between the Manly and Warringah Local Government Areas(LGAs), as shown in Figure 1.1. As a result both Manly and Warringah Councils take a proactiverole in the management and improvement of the Lagoon.WARRINGAHMANLYFigure 1.1: Locality Map and LGA Boundaries (After: DEWHA, 2009)Manly Lagoon has a surface area of approximately 0.2km 2 and a catchment area of 18km 2 .Approximately 60% of this catchment area is classified as residential (DNR, 2009). The2 July 2010 Cardno (NSW/ACT) Pty Ltd 2H:\Doc\2010\Reports.2010\Rep2580v4.doc
Manly Lagoon Dredging Project – Review of Environmental FactorsPrepared for Manly and Warringah Councilsmajority of the Lagoon foreshore is public and private open space and includes parklands,reserves, and Manly and Warringah Golf Courses, as indicated on Figure 1.2.The catchment is drained by three major freshwater creeks that flow into Manly Lagoon,including Burnt Bridge Creek, Manly Creek and Brookvale Creek (Figure 1.2). Flows withinManly Creek are subject to influence of the Manly dam, which is located approximately1.5km to the west of the lagoon. A large number of stormwater drains in the catchment alsoflow into the Lagoon, and can have an impact on water quality and flow.The ocean entrance of the Lagoon is situated at the northern end of Queenscliff Beach andis an intermittently/mechanically opened, untrained entrance (DNR, 2009). A 3.3m wide by1.8m high box culvert located at the entrance conveys low flows to the ocean and allowslagoon and ocean waters to exchange with each tidal cycle. During times of flooding,bulldozers excavate a flood overflow channel across the beach berm to open the channel tothe ocean and convey flood flows (PBP, 2003a).Manly Lagoon is considered one of the most polluted waterways on the east coast ofAustralia, with swimming, boating and fishing activities currently not recommended due topolluted water and sediment (Manly Council, 2009). Poor water and sediment quality in theLagoon is mainly due to local pollution sources including urban stormwater runoff, sewageoverflows, former tip site leachate and illegal discharge and dumping of industrial and tradewaste (Manly Council, 2009).2 July 2010 Cardno (NSW/ACT) Pty Ltd 3H:\Doc\2010\Reports.2010\Rep2580v4.doc
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<strong>Manly</strong> <strong>Lagoon</strong> <strong>Dredging</strong> <strong>Project</strong> – Review of Environmental FactorsPrepared for <strong>Manly</strong> and Warringah <strong>Council</strong>smajority of the <strong>Lagoon</strong> foreshore is public and private open space and includes parklands,reserves, and <strong>Manly</strong> and Warringah Golf Courses, as indicated on Figure 1.2.The catchment is drained by three major freshwater creeks that flow into <strong>Manly</strong> <strong>Lagoon</strong>,including Burnt Bridge Creek, <strong>Manly</strong> Creek and Brookvale Creek (Figure 1.2). Flows within<strong>Manly</strong> Creek are subject to influence of the <strong>Manly</strong> dam, which is located approximately1.5km to the west of the lagoon. A large number of stormwater drains in the catchment alsoflow into the <strong>Lagoon</strong>, and can have an impact on water quality and flow.The ocean entrance of the <strong>Lagoon</strong> is situated at the northern end of Queenscliff Beach andis an intermittently/mechanically opened, untrained entrance (DNR, 2009). A 3.3m wide by1.8m high box culvert located at the entrance conveys low flows to the ocean and allowslagoon and ocean waters to exchange with each tidal cycle. During times of flooding,bulldozers excavate a flood overflow channel across the beach berm to open the channel tothe ocean and convey flood flows (PBP, 2003a).<strong>Manly</strong> <strong>Lagoon</strong> is considered one of the most polluted waterways on the east coast ofAustralia, with swimming, boating and fishing activities currently not recommended due topolluted water and sediment (<strong>Manly</strong> <strong>Council</strong>, 2009). Poor water and sediment quality in the<strong>Lagoon</strong> is mainly due to local pollution sources including urban stormwater runoff, sewageoverflows, former tip site leachate and illegal discharge and dumping of industrial and tradewaste (<strong>Manly</strong> <strong>Council</strong>, 2009).2 July 2010 Cardno (<strong>NSW</strong>/ACT) Pty Ltd 3H:\Doc\2010\Reports.2010\Rep2580v4.doc
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