Why is Surveying for Stone Installation more difficult?
Surveying stone that has been placed underwater presents more challenges than surveying sandy seafloors or placing stone on dry land. Surveying stone on dry land is a relatively tangible and direct exercise. Surveying stone placement underwater means determining the level of the tops of the placed stone and the position of the reference plane. However, the acoustic beams may not always hit the tops of the stone level, but rather go in between the stones themselves reaching the seafloor. This can distort the data and give inaccurate measurements. Accuracy is also affected by the diameter of the stones used: The smaller the stones, the higher the accuracy. During a large operation, surveys are sometimes done on a spot-check basis. This saves time and money in the short run, but increases the risk of missing a bed area where the stone placement is not correct. In the long run, the importance of using highly trained personnel and a quality surveying system cannot be underestimated. How acc
