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sandy

Tweed Sand Bypassing is a joint initiative of the New South Wales and Queensland State Governments. The project's objectives are to establish and maintain a safe, navigable entrance to the Tweed River and restore and maintain the coastal sand drift to the beaches on the southern Gold Coast of Queensland. 

The Project is a sand transport system that collects sand from the southern side of the Tweed River entrance at Letitia Spit, and pumps it under the river to outlets on the northern side. From there the sand is transported by waves and  currents to nourish the southern Gold Coast beaches. The project periodically dredges sand that accumulates at the Tweed River entrance which is also transported to southern Gold Coast beaches. The system is designed to transport the natural quantities of sand that move northwards along the coast. 

More detailed information on the project background can be found here