Description
The reference rating is the elevation of the water body modelled to the right of an existing project or construction.
It is displayed in m NGF-IGN 69, i.e. in meter in the official leveling network in metropolitan France, which is attached to the Marseilles tidegrapher.
Therefore, the reference rating does not correspond to a water level but to the altimetry of the water body.
The water height is the difference between the reference and the altimeter dimensions of the natural terrain.
Resources
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