1 - NGA

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low water datum-An approximation of the
plane of mean low waler, adopted as a
standard datum plane for a limited area,
and retained for an Indefinite period, even
Itmugh If might dltter slightly horn a bettar
datermlnatlon 01 mean low waler from later
obsewalions.
low water tull and change-The average
Interval of time between the Iransil (upper
or lower) of the full or new Moon and the
next low water.
low water inequality-See dlurnaf
Inequality.
low water lfrtervel-See Iurtitldal
Interval.
low water llne-The line defined by the
bourtdary of a body of waler al ita lowest
stage (elevation). in tidal waters, ftre low
water line is, strictly, the intersection of the
plane of mean low waler with the shore.
low water krnltldal interval-See
turzltldal Interval.
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low wster aprlnge datum—An
approximation of the plane of mean low
water Sprirros, Wad as a datum in local
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araas, and ‘retained for an Indaiinile period,
even thouoh It mloht differ sliohllv from a
batter det