HYDROGRAPHIC SURVEY are made to acquire data required to chart and/or map shorelines and bottom depths of streams, rivers, lakes, reservoirs and other larger bodies of water. This type of survey is also of general importance to navigation and to development of water resources for flood control, irrigation, electrical power, and water supply. As in other special surveys, several different types of electronic and radio-acoustical instruments are used in hydrographic surveys.These special devices are commonly used in determining water depths and location of objects on the bottom by a method called taking SOUNDING. Sounding are taken by measuring the time required for sound to travel downward and be reflected back to a receiver aboard a vessel
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