A bench mark is a Surveyor's mark made on a permanent mark that a position and altitude. The benchmark can be a random point determined by the surveyor or it could be something permanent in nature such as the corner of a concrete pad or a survey monument. The establishment of a benchmark is the first step to having a topographic survey performed. This is the point that all of the data will be compared to and will be the basis of the topographic survey performed and a drawing created.
