The information provided by the Government of the Hong Kong Special Administrative Region ("the Government") on this website ("the Government's information") is for reference only. Whilst the Government endeavours to ensure the accuracy of the Government's information on this site, no express or implied warranty is given by the Government as to the accuracy of the Government's information. This website also contains information input by other parties and users may link this site to other sites and obtain information provided by other parties (collectively called "the other information"). The Government expressly states that it has not approved nor endorsed the other information contained in or in connection with this site. The Government does not accept any responsibilities for any loss or damage whatsoever arising from any cause whatsoever in connection with this website. The Government is entitled to delete, suspend or edit all information on this site at any time at its absolute discretion without giving any reason. Users are responsible for making their own assessments of all information contained in or in connection with this site and are advised to verify such information by making reference to its original publication and obtain independent advice before acting on it.

Accuracy of Prediction

The tidal prediction made by Hong Kong Tidal Stream Prediction System is based on the tidal components generated from the updated Hong Kong Tidal Atlas model. The tidal components consist of amplitude and phase of 66 chosen tidal constituents. These predictions will deviate from the actual conditions in the field since temporal and localised meteorological effects and non-tidal flow variations could not be taken into account. Moreover, its accuracy further depends on the chosen tidal constituent set, accuracy of the underlying model, length of the simulation and location of the data points within the model, etc.

According to the comparison of the predicted data with the actual field observed data, the average difference in current peak magnitude ranges from 0.03 m/s to 0.21 m/s, while the average phase difference in peak velocity was around 17 minutes.

System Requirements

Our Website is suitable to be viewed on desktop computers only. This system is not compatible with mobile platforms and may encounter the risk of system errors on mobile platforms.

Copyright Notice

The information available within this website may be re-disseminated or reproduced, provided that the Marine Department, as the source of information, is acknowledged and that the re-dissemination or reproduction is for non-commercial use. Any other reproduction, adaptation, distribution, dissemination or making available of the information available within this website for commercial use is strictly prohibited unless prior written authorization is obtained from the Marine Department. The Marine Department and the HKSAR Government shall not accept any responsibilities for any loss or damage arising from the information, or reproduction or re-dissemination of the information, within this website.

Web Accessibility Conformance Statement

We are committed to ensuring that our website conforms to the World Wide Web Consortium (W3C) Web Content Accessibility Guidelines (WCAG) 2.0 Level AA requirements to the maximum extent possible. However, as our website contains a considerable amount of multimedia, PDF and Word contents, not all levels of accessibility features have been incorporated. For enquiry, please email us at hydro@mardep.gov.hk. We will try our best to provide the information in a format accessible to you.

Marine Department - Privacy Policy Statement

The Marine Department takes a prime concern about the protection of privacy in relation to personal data. We respect personal data and are committed to fully implementing and complying with the data protection principles and all relevant provisions of the Personal Data (Privacy) Ordinance.

On-line PPS - Data Collection and Use

"We collect personal information which may include name, mailing address, etc. from our site visitors for processing their requests or sending them materials. The information is used only by us for the purposes stated in the respective screens and such data will not be retained once the required action is completed. We do not use your personal data for any other purposes without your prior consent unless such use is permitted or required by law." For enquiries, please telephone the number 2504 0711 during office hours.