River Leven Weir Survey 13 October 2023 /Posted byStephen Lainson / 0 Case Studies Using a short range, high-definition 3D SONAR that could operate in the fast moving water, we were able to 3D map all the submerged surfaces of the weir to confirm its condition. Download PDF About the author: Stephen Lainson Stephen is the Managing Director of Fortis Remote Technology, a Mechanical Engineering business, in Cumbria.