What is the definition of Mean Low Water Springs (MLWS)?

Mean Low Water Springs (MLWS) is defined as the average height of low waters that occur during spring tides, which typically happen when the gravitational forces of the moon and sun align, resulting in higher high tides and lower low tides than usual. This average takes into account the variations that occur over a standard period, typically 19 years, to provide a reliable reference for navigational purposes.

Understanding MLWS is crucial for mariners and navigators, as it helps determine clearance for vessels, locate underwater hazards, and plan docking and anchoring procedures, especially in areas where tidal fluctuations significantly impact water levels. This definition emphasizes the importance of low water data, specifically during the spring tide cycle when the tidal range is most pronounced.

The other options do not accurately capture the essence of what MLWS represents. For instance, the average height of high waters during spring tides refers to a different tidal measurement unrelated to low water. daily low tides and tidal currents provide information about other aspects of tidal behavior but do not pertain specifically to the average low water heights during spring conditions. Thus, the focus on averaging low waters during spring tides in the correct answer is what defines MLWS effectively.