TIDES

Orleans Conservation Commission:

A. SPRING:10.04 – Those tides that occur at or near the time when the gravitational forces of the sun and moon are in phase (new and full moons), and which are of the greatest amplitude during the approximately 14-day tidal cycle.

B. NEAP – Those tides that occur between the new and full moons and have less variation than the spring tides.

C. EXTREME – Those tides generally associated with storms or astronomical configurations and are perceptibly higher and lower than the spring tides.

D. MEAN HIGH WATER: 10.23 – The line where the arithmetic mean of the high water heights observed over a specific 19-year metonic cycle (the National Tidal Datum Epoch) meets the shore and shall be determined using hydrographic survey data of the National Ocean Survey of the U.S. Department of Commerce and local observations.

E. MEAN LOW WATER: 10.23 – The line where the arithmetic mean of the low water heights observed over a specific 19-year metonic cycle (the National Tidal Datum Epoch) meets the shore and shall be determined using hydrographic survey data of the National Ocean Survey of the U.S. Department of Commerce and local observations.