Elements that May Be Found on All Panels: Elevation Reference Marks (Slideshow)

Elevation Reference Marks (ERMs) identify points where a ground elevation was established by survey. These elevations are usually expressed in feet; elevations in Puerto Rico are expressed in meters. Descriptions of the marks, including their elevations, are provided.

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Flood map with elevation reference notes highlighted.Elevation Reference Marks, Reference mark RM 40-1 Elevation in Ft. (NGVD) Descripton of location: Brass disk set vertically in concrete post ling at northeast intersection of Wellington Road and Short Court, approximately 1 foot west from fence line. Refrence Mart FM 40-2 Elevation in Ft. (NGVD) Description of Location: Railroad spike in power pole on northeast corner of South Road and Dairy Road. (NGVD) National Geodetic Vertical Datum of 1929Elevation reference mark RM 40-1 and elevation reference mark 40-2 are highlighted on flood map
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Elevation Reference Mark description on flood mapElevation Reference Mark description example textElevation Reference Marks RM 40-1 and RM 40-2 on flood map