Tidal Period
Input the tidal period in hours. The tidal period represents the time it takes for the tide to complete a full cycle, for example from high tide to low tide and then back to high tide again. For the upper waters in the Chesapeake Bay in the Maryland area, SHA typically use a value of 24 hours for storm tides based on previous studies such as the tide study for the Severn River Bridge. For the lower bay, the tidal period for storm tides is reduced somewhat to perhaps 18 hours. Normal daily tides in the Chesapeake Bay experience two high tides per day, and the period of these tides is closer to 12 hours.