'Sounding' in hydrographic surveying measures:
Choose the correct answer
Flow velocity in rivers
Water depth at various points to create bathymetric charts (depth maps) for channels, reservoirs, navigational charts
Groundwater table elevation
Sound level in a harbour
Correct Answer
B. Water depth at various points to create bathymetric charts (depth maps) for channels, reservoirs, navigational charts
Why is this the answer?
Sounding: measurement of water depth at various points. Methods: lead line (simple, still water), echo sounder (time-of-flight of acoustic pulse, most common), sounding rod (shallow water). Soundings plotted with plan position to create bathymetric chart (depth map). Used for: channel design, dam capacity, navigational charts, dredging operations.
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