The northern side of the Dawesville Channel has a shorter training wall, just 50 m in length, with a 150 m long groyne located 100 m to the north and a seawall linking the two walls and continuing for 500 m to the north. The training wall has been built to control or train the flow through the channel, while the groyne is designed to presumably stop sand moving southward and into the channel. The seawall is a result of the severe beach erosion that has occurred since the channel and walls were constructed. While sand is pumped under the channel from Pyramids beach, erosion is continuing on the northern side, as it is starved of the sand that would normally move northward along the coast. This sand is part of a beach system that extends northeast for 11 km to Robert Point at Mandurah, where the sand moves around the point and into the next long sediment cell. In between are 13 near continuous beaches (wa778-790) most separated by low beachrock reefs and calcarenite outcrops. The first seven beaches are located along the 5 km of northeast-trending shore between the channel and Falcon. Between the northern wall and Falcon, 3 km to the north, are four beaches (wa778-781). The first two have been heavily modified by the walls and groynes. Beach wa778 is a 100 m long pocket of sand wedged in between the large rocks of the training wall and the groyne. Waves averaging just over 1 m break across a 50 m wide bar, with a strong rip running back out the centre. Its neighbour (wa779) varies in size depending on the amount of sand pumping. When small it consists of a wedge of sand in the southern corner between the groyne and backing seawall. During nourishment it may extend for 500 m along the seawall and link with the northern section, which is fronted by a beachrock reef. A road from Northport cuts through the backing dune and calcarenite to reach the rear of beach wa789 and run out to the training wall. read more

Beach Length: 0.8km