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||23.9 ppt||24 Jun 22:15||52|
|Bennetts Bay||15.0 ppt||23 Jun 01:59||37|
|Brooklyn Baths||28.6 ppt||21 Jun 01:59||93|
|Calabash Bay||18.6 ppt||24 Jun 13:45||31|
|Courangra Point||23.7 ppt||24 Jun 22:00||58|
|Crosslands Reserve||11.3 ppt||24 Jun 06:15||1|
|Dangar Island||29.5 ppt||23 Jun 01:59||95|
|Deadhorse Bay||29.8 ppt||23 Jun 01:59||93|
|Gosford||13.8 deg C (air temp)||25 Jun 02:30|
|Gunyah Point||33.4 ppt||24 Jun 22:00||93|
|Laughtondale||1.8 ppt||24 Jun 14:15||58|
|Marramarra Creek||7.1 ppt||21 Jun 01:59||42|
|Twin Beaches||12.3 ppt||23 Jun 01:59||45|
|last updated :2017-06-25 02:51|
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.