This system utilises recorded data captured by Manly Hydraulics Laboratory (MHL) on behalf of Hornsby Shire Council. Recorded data is downloaded from monitoring stations at intervals throughout the day. Displayed salinity values on the swimming conditions page are calculated as the average of salinity measurements for the latest 24 hours of data. At locations without recorded data, salinity is estimated using correlated values from nearby recorded data.

IMPORTANT: This information has been recovered directly from automatic recording equipment and has not been quality controlled by MHL. The State of NSW (of which MHL is an agency) does not warrant the quality, accuracy, currency, reliability or correctness of this information and accepts no liability for any loss, injury (including death), or damage which any person relying on this information may suffer.