datum level or datum line
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surveying the horizontal plane from which heights and depths are calculated
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
How to use datum plane in a sentence
Usually the contour has labeled on it in figures the height above some starting point, called the datum plane—generally sea level.
The contours on maps are always numbered, the number of each showing its height above some plane called a datum plane.
In all maps that are to be contoured some plane, called the datum plane, must be used to which all contours are referred.
A datum plane, or reference surface, from which all elevations are measured up to the ground surface must be assumed.
C, at 100 ft., or greater if necessary to place the datum plane below the ground level at all points within the area to be mapped.