As mentioned previously, to maintain the Adelaide beaches there is an ongoing sand carting program. The natural drift is northwards and sand builds up in places like the entrance to the Patawalonga at Glenelg. The sand is being loaded here at Glenelg and 'returned' to Brighton (south of Adelaide).
Beach replenishment was first started in 1973 with an average of 100,000 cubic metres of sand being moved each year. Click here to read more (on the City of Holdfast Bay website)