An area from which surface runoff is carried away by a single drainage system or the area of land bounded by water sheds draining into a river, basin or reservoir. Areal and topographical surveys are used to determine the various purpose of water catchment studies such as Rivers flow mapping Calculating total area of catchment Flood affect map Dam management Water quality and shed mapping Rain water conservation.

A bathymetric, or hydrographic survey, is an underwater topographical survey of water’s bottom. It will measure the depth of water and reveal the amount of sediment that is present below the surface of the water. It’s an important part of the dredging process because it reveals the scope of the sediment problem in your seawater, lagoon, pond, Dam, lake, Marina, or storm water basin. Landmark Survey Engineering uses Single Beam and Multi beam Echo sounder, Side Scan Sonar, and GPS positioning technology to survey body of water. The cost depends upon the size of the water body. If you decide to contract with us for your dredging project, we will then credit the cost of the survey to the price of the entire project. Professional Hydrographic Survey Hydrographic survey is the science of measurement and description of features that affect maritime navigation, marine construction, dredging, tides measurement, offshore oil exploration/drilling, and related activities. The term Hydrography is sometimes used synonymously to describe Maritime Cartography, which in the final stages of the hydrographic process uses the raw data collected through a hydrographic survey into information usable by the end-user. Strong emphasis is placed on soundings, shorelines, tides measurement, currents, seafloor, and submerged obstructions that relate to the previously mentioned activities. Vessels equipped with Echo Sounding traditionally conduct hydrographic surveys.