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Harbours, marinas and boat ramps can act as valuable tourism and commercial assets, but their presence can also impact on the local coastal processes. These impacts are considered during the planning stages of the project and marinas are designed to minimise the impacts wherever possible.

Long-term management of harbours and marinas is common practice and often includes sand bypassing using various methods such as trucks, pumping infrastructure and dredging.

In Adelaide, the Glenelg and West Beach harbours obstruct the northerly movement of sand along the coastline causing sand to accumulate on the southern side of these harbours.

In the past, to prevent erosion to the north, sand was artificially moved from the southern side to the northern side of the harbours. Sand building up at these harbours is now used to replenish beaches to the south, which results in more effective recycling of sand as well as reduced harbour management costs.

Similar techniques are used in other harbour management strategies throughout South Australia.

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