HawkesburyWatch is a near real-time rainfall, water level and water quality monitoring system which provides information to Hornsby Council and the public of NSW. This management system has been developed by MHL for Hornsby Council to provide maps of Salinity, Temperature and Swimming Conditions in the lower Hawkesbury river. For further information visit hornsby.nsw.gov.au.
|Pollution is likely||Swim at own risk||Pollution unlikely|
Parts per 1000
|Latest data||Status||% 'Pollution unlikely'|
in the last 12 months
|Bar Island||30.2 ppt||24 Sep 22:15||73|
|Bennetts Bay||19.6 ppt||20 Sep 23:59||42|
|Brooklyn Baths||34.3 ppt||20 Sep 23:59||96|
|Calabash Bay||27.4 ppt||24 Sep 21:30||43|
|Courangra Point||24.0 ppt||24 Sep 22:00||81|
|Crosslands Reserve||21.3 ppt||24 Sep 06:15||1|
|Dangar Island||34.2 ppt||20 Sep 23:59||97|
|Deadhorse Bay||33.1 ppt||20 Sep 23:59||96|
|Gosford||17.1 deg C (air temp)||24 Sep 23:30|
|Gunyah Point||34.8 ppt||24 Sep 22:00||96|
|Laughtondale||10.0 ppt||24 Sep 22:15||81|
|Marramarra Creek||8.3 ppt||20 Sep 23:59||42|
|Twin Beaches||14.8 ppt||20 Sep 23:59||46|
|last updated :2017-09-24 23:36|
Salinity data has been used to predict the likelihood of bacterial contamination at swimming sites in the Hawkesbury. The occurrence of freshwater in the estuary following rainfall increases the likelihood of pollution being present. Obvious signs of stormwater pollution are water discoloration as well as debris in the water and tide line. When pollution is likely, swimmers may be at increased risk of contracting illness and swimming at these times should be avoided.
This system utilises recorded data captured by MHL on behalf of HSC and a 3D hydrodynamic model configured by Office of Environment and Heritage for HSC of the Hawkesbury-Nepean estuary. Model input data is sourced from various agencies including Bureau of Meteorology, MHL, SCA, OEH and Dept of Primary Industries Office of Water.
Data is downloaded at 2am each morning and the model is run based on the previous days monitored data. The results will show interpolated contour maps based on the previous day.