The approach with each reservoir was to scan the arm edges of the reservoir first with the MBES tilted to 30 degrees to capture the shallowest extents of the bathymetry. As each arm edging was completed the remaining area of the bathymetry was filled in before moving to the next arm. Once the arms were complete the features of the overflow structure and dam face were collected in the same manner. The remaining bathymetry in the deep water was then completed and the boat removed from the water for MLS reconfiguration. The topographical data was collected in a single pass around the perimeter with the MLS. The accuracy of depths for this survey is assessed as +/-0.1m or better.
A UAV and total station was used to accurately map and determine the height of each dam spillway.