Digital Terrain Models (DTM) were used to validate the ground survey topographical map. Furthermore, this solution offered a reliable and very accurate database essential to assess the feasibility study. It was used to estimate the hydraulic head and the energy production of the SHPP, to locate the main project components (e.g. weir, powerhouse), to assess the layout and the type of waterways and to estimate the catchment area. The use of DTM is essential to the planning process and the decision-making process.
Airbus WorldDEM is perfect to cover a global area and suited the need to cover a larger area. The plausibility of the ground survey topographical map can be checked with the WorldDEM and vice versa. As a result, Tractebel were able to confirm the sizeable deviations found in the existing topographical maps and developed the general alternatives for the SHPP Nua.