A major energy company commissioned Storm Geomatics to measure the flow rates through a number of lock gates on The Manchester Ship Canal. The measurements are to be used to calculate the leakage through the gates and contribute towards an energy calculation for the installation of a new water turbine. Storm Geomatics combined forces with personnel from the new Storm Geomarine team to bring logistics, acoustic, positioning and analysis skills together to solve the problem. Site conditions were difficult, but good planning, experienced staff and a good understanding of the project outcomes provided the client with exactly the data they needed.