Dredged sand may be placed on the beach on occasions, in such a way to try and avoid large piles of sand from accumulating. Council aims to ensure the beach resembles a natural slope at the end of each program. If required, bulldozers or other heavy machinery are be used to reshape the beach. 

Dredging is permitted on the western side within the approved footprint area detailed in the Review of Environmental Factors (REF). Primarily dredging is conducted on the east side of the bridge as it aims at extracting or trapping shifting sand shoals prior to them entering the estuary west of the bridge.

Council dredges for reasons outlined in its REF and in compliance with its dredging licences.

The Crown Land Licence does not permit dredging to be conducted within 10m of any wharf/jetty or pile or within 15m of any bridge or submarine crossing.

Council does not dredge for navigation; this is the responsibility of the NSW Roads and Maritime Services.

Yes, before our most recent Review of Environmental Factors (REF) was renewed in 2009 dredging was undertaken on average every 12 months.

The conditions set out in the REF have resulted in a change in the way dredging is conducted and thus a longer time between dredging programs. The change in frequency is balanced by an increase in the time spent dredging on each occasion.

The 2020 dredging campaign will take around two and a half months to complete, commencing in mid-September and concluding end of November 2020, and will depend on factors including weather conditions and the arrival of the Little Tern.

Central Coast Council dredges The Entrance Channel, on behalf of the NSW Government on average every two to three years.

The most recent programs were in 2018 and 2015.

To undertake dredging Council must gain the necessary approvals from the NSW Government to ensure the operations are undertaken in the most environmentally friendly manner and that measures are put in place to prevent environmental harm. These approvals include a licence under the Protection of the Environment Operations Act 1997 (POEO Act). One of the conditions of the licence is to monitor water quality during dredging activities to ensure there is no negative impact on the environment.

Council has also prepared a range of documentation to support the dredging campaign including the Review of Environmental Factors (REF), Pollution Incident Response Management Plan (PIRP) and Construction Environmental Management Plan (CEMP), as well as obtained a Crown Licence (#3683371) and Fisheries Permit (PN19/110).

If feasible, the dredged sand is used to beneficially renourish areas that have been determined via conducting land, hydrographic, drone/aerial and visual surveys. The use of dredged sand for renourishment has three main aims:

• to provide maximum environmental benefit to the dune system by protecting the dunes and the ecosystems reliant on them
• to protect assets and the recreational amenity of the beach for the community
• to keep the sand circulating within the complex entrance system to prevent a loss of sand over time. This is necessary to maintain the sand spit, The Entrance sand bar and flood tide shoals that are the natural control on lake levels and provide protection of the estuary from ocean storms.

Therefore, the sand is pumped onto the northern shore of The Entrance Channel with the aim of nourishment of the beach, dunes and offshore shoals for coastal erosion protection measures. The exact location of sand placement is determined year to year based on the current environmental conditions and competing demands.

Sand may also be pumped to The Entrance beach to cover exposed rock shelves that exist in the wash zone which pose a safety risk to the public and have resulted in previous beach closure. Some sand may be placed in front of Dunleith Tourist Park and Karagi car park to replenish the shoreline at this location.

Dredging is not permitted for other purposes such as commercial gain from sale of the extracted sand.

Dredging is undertaken during the autumn and winter months for a number of environmental and social reasons:

• The threatened birds species the Little Tern (Sterna albifrons) is known to breed on The Entrance sand spit and feed within the entrance channel during the spring-summer months
• Commercial fishers have indicated their preference for the dredging to not be undertaken during the prawning season which generally ends by March
• For aesthetic and safety reasons’ dredging is not undertaken during the peak tourist season in the area which coincides with the December (summer) school holidays.

The channel would go through a cycle of closing and opening. This is a completely normal process. It may cause the ecology of the estuary to experience some change. It is understood in the event of a major flood event the channel would overtop/ self-scour and open anyway to let the flood waters out naturally.

Dredging is only undertaken when a set of indicators are reached, which is why dredging is not required every year. This measure saves rate payers money by not undertaking unnecessary works and ensures an exchange of water is maintained between the estuary and the ocean.

The indicators include:

• The throat of the channel (near the southern tip of the sand spit) at The Entrance reduces to an estimated width of less than 15m measured at mid tide level. Estimating this measurement has been assisted by the CoastalComms camera installed to monitor The Entrance.
• The flood tide sand shoals threaten to block the ebb tide dominant channel along the northern/eastern side of The Entrance area.
• The flood tide sand shoals threaten to block the main channel east of the bridge.

Central Coast Council holds an Environmental Protection Licence (EPL) No. 3200 with the EPA for dredging of the Entrance Channel.

A Prevention Notice (Number 1598442) was issued by the EPA to Council in November 2018 for causing ‘water pollution’ by disposing of dredge spoil directly into the surf zone of North Entrance Beach. This was standard practice for surplus dredge spoil when North Entrance was fully nourished to capacity.

On 7 August 2020, the EPA revoked the Prevention Notice after variations to EPL3200 were approved.

Council dredges The Entrance channel to the Tuggerah Lakes estuary to maintain exchange between the estuary and the ocean. This may offer some benefit:

• to preserve the existing ecological values of the estuary
• to reduce flood risks to life and property in low-lying areas around the estuary
• to enhance navigation within The Entrance Channel

The impacts of building a breakwall or twin breakwalls at The Entrance has been investigated by numerous coastal engineers over the past decades. The most recent study commissioned by the NSW State Government’s Office of Environment and Heritage found that all breakwall options considered within their study did not self-scour (except under extreme flood conditions) meaning that maintenance dredging, such as the current program, would still be required to maintain an open channel with the ocean.

Construction of any breakwall/training wall at The Entrance Channel will therefore not replace the need to dredge, the dredging program would still need to be undertaken to maintain an exchange of water between the estuary and the ocean. The studies additionally found that the construction of a breakwall would provide no added benefit to the lake in terms of flushing or improving water quality in the lake.