A bathymetric survey is a scientific method used to measure and map the depth and contours of underwater terrain, such as riverbeds, lakes, reservoirs, and ocean floors. Using advanced equipment like echo sounders, GPS, and sonar systems, it provides precise data on water depth and underwater topography. This information is essential for various applications, including navigation, construction, environmental studies, dredging, and flood management. Bathymetric surveys play a crucial role in ensuring safe waterway navigation, assessing aquatic ecosystems, and supporting sustainable water resource management.