Narrabeen Lagoon

Sea Wall Entrance to Narrabeen Lagoon

The key processes that affect the entrance to Narrabeen Lagoon include:

•The movement of the entrance

•The pattern of water flow

•The closure of the entrance

Issues created when the lagoon entrance is closed:

•Lack of tidal flow

•Pollution build up

•Sea life is killed

•Increased risk of flooding

Entrance to Narrabeen Lagoon

Humans have affectively shaped the way we see Narrabeen lagoon today. They have had both a positive and negative impact on the lagoon. •The main development that the council has put in place is the retaining, rock seawall-

•Positive impact: stops the lagoon shifting North•Negative Impact: makes the water travel faster causing rips and currents

•Council must dredge the every 4 or 5 years-•Positive impact: allows tidal flow and keeps public happy as to not flooding•Negative impact: Benthic fauna lose habitat every time lagoon is dredged

Evaluate the effectiveness of TWO management strategies that have been used to combat sediment build-up at the North Narrabeen Lagoon entrance.