Tidal changes occur predictably in coastal waters and rivers, but the timings of high and low tides fluctuate throughout the year. To ensure any change in tide behaviour is accounted for when planning actions at an incident, the incident commander should use tide charts or timetables. Information on tide times is available from the Met Office and from local sources.

Local authorities, water management bodies, environmental agencies and the Met Office may be available to provide water temperature charts. Available charts will provide either average, expected or up-to-date water temperature information for seas, rivers and other bodies of water. Where available, temperature data should be considered during planning and may assist during operational activity.