The popular beach enjoys excellent water quality most of the time throughout the year. All of the sewage from the nearby settlement is diverted away from the beach, whereas the wastewater from its beach facilities is conveyed to a public sewer. Its beach water quality becomes slightly worse during the rainy season. Two freshwater sources which discharge into the beach water are the potential causes. As the ambient Southern waters of the beach are generally clean, the pollution from the ambient water outside the bay is minimal. Although the beach is usually clean, salinity is still a good indicator of beach water quality.

Monthly distribution of beach gradings at Deep Water Bay beach (2010-2014)

Aerial photo and local pollution sources

Source 1: Channelized stream

A stream enters the beach from the northern beach

Source 2: Storm drain

Storm drain discharges into the middle of the beach

Source 3: Storm outfall

Storm outfall connected to the beach sewage pumping station

The streamflow is predicted by the hydrological model, the MIKE-SHE model. Click here to know how the simulation is carried out, using the Big Wave Bay as an example.