Here are the incoming tide swells being chased by wind gusts in Great Cove. Our November high tides have ranged from about 10 to 12 feet, according to National Oceanic and Atmospheric Administration data.
Thus, basically, if you stuck a six-foot measuring post into the low tide line, the top of the post would be under four to six feet of water in less than six hours. Of course, posts and/or sliding floats are no longer used to officially measure the tides.
NOAA uses sophisticated acoustical and electronic equipment to record tide heights along the coast, including Brooklin’s Center Harbor. Basically, the equipment sends signals continuously down a sounding tube that is within a protective pipe in the water; the time that it takes for the signal’s reflected sound to travel back and be received on the water surface is measured and converted into streaming linear data. (Brooklin, Maine)