Which term describes the lowest level that can be expected under various conditions?

The term that describes the lowest level expected under various conditions is "Lowest Astronomical Tide." This term specifically refers to the lowest level of tide that can be predicted to occur under astronomical conditions, taking into account the gravitational influences of the moon and sun, and their alignment with respect to the Earth. It is a standard reference that surveyors and mariners use because it provides a reliable datum for navigation and coastal management.

In hydrographic surveying, knowing the Lowest Astronomical Tide is essential as it ensures that any measurements of depth or clearances are made with a clear understanding of the potential minimum water levels. This aids in planning safe navigation routes, determining the suitability of anchorage areas, or assessing potential maritime impacts on coastal infrastructure.

Other terms like Mean Low Water, Lowest Average Tide, and Minimum Tide Level may refer to average or typical lower water levels but do not indicate the absolute lowest level that can be expected under various conditions like the Lowest Astronomical Tide does.