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A multibeam echosounder (MBES) is a type of sound navigation and ranging device that uses sound waves to “see” through even murky waters (fig. 1: Note that all figures used in this report are for an illustrative rather than an interpretive purpose, not all geographic locations will be shown). Unlike a single beam echosounder (also known as a depth sounder or fathometer) that releases a single sound pulse in a single, narrow beam and “listens” for the return echo, a multibeam system emits a multidirectional radial beam to obtain information within a fan-shaped swath (figs. 1, 2). The timing and direction of the returning sound waves provide detailed information on the depth of water and the shape of the river channel, lake bottom, or any underwater features of interest. This information has been used by the U.S. Geological Survey (USGS) to efficiently generate highresolution maps of river and lake bottoms. The Multibeam Echosounder Mapping System

Hydrographic surveys of rivers and lakes using a multibeam echosounder mapping system