mean sea level


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mean sea level

n.
The average level of the ocean's surface, calculated as the arithmetical mean of hourly tide levels taken over an extended period and used as the standard for determining terrestrial and atmospheric elevations and ocean depths.

mean sea level

n
(Surveying) (in the UK) the sea level used by the Ordnance Survey as a datum level, determined at Newlyn in Cornwall. See sea level

mean sea level

The average height of the surface of the sea for all stages of the tide; used as a reference for elevations. Also called MSL.
References in periodicals archive ?
The utility then will raise the reservoir's water level back up to about 520 feet mean sea level, a typical wintertime level.
The lake level is expected to crest near 467 feet mean sea level, about two feet above its normal full summer pool level of 465 feet.
The lake level will be lowered to 127 feet above mean sea level until repairs are complete.
The planned total depth is approximately 1,350 metres below mean sea level and the well is being drilled using the drilling rig Island Innovator.
Considering that much of the metropolitan region of New York City is less than 16 feet above the mean sea level, with some parts of lower Manhattan only about 5 feet above the mean sea level, a rise of 8.
Drilling of Mengkuang-1 was done with the West Prospero jackup rig to a total depth of 1,259 m below mean sea level.
The flight consisted of a 65,000 pound Drop Test Article (DTA), which simulates the QuickReach(TM) launch vehicle dropped from an unmodified C-17A aircraft at an altitude of 29,500 feet above Mean Sea Level (MSL) and a true airspeed of 330 knots.
The planned total depth is approximately 3,104 metres below mean sea level and the well will be drilled with the semi-submersible drilling unit Island Innovator.
While her A-10 was passing 4,000 feet mean sea level during departure for a local night sortie, Capt Vitas noticed the left fuel flow gauge fluctuating plus/minus 500 pounds per hour and the left oil pressure gauge fluctuating plus/minus 15 to 20 pounds per square inch.
Warrington based United Utilities yesterday confirmed each of the 30 turbines would be 443ft above mean sea level, bigger than the London Eye.
Lay Lake will be lowered to an elevation of about 393 feet above mean sea level.