Science / Geology / Hydrograph: A graph that shows the change of a water-related variable over time. Example: A stream discharge hydrograph shows the change in discharge of a stream over time.
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International Hydrographic Organization

Science / Tides and Currents / International Hydrographic Organization: An institution consisting of representatives of a number of nations organized for the purpose of coordinating the hydrographic work of the participating governments. It had its origin in the Internati MORE

Hydrographic Datum

Science / Tides and Currents / Hydrographic Datum: A datum used for referencing depths of water and the heights of predicted tides or water level observations. Same as chart datum. See datum. MORE


Science / Marine Biology / Hydrographic: Referring to the arrangement and movement of bodies of water, such as currents and water masses MORE


Science / Tides and Currents / ZO: Symbol recommended by the International Hydrographic Organization to represent the elevation of mean sea level above chart datum. MORE

Lowest Astronomical Tide

Science / Tides and Currents / Lowest Astronomical Tide: As defined by the International Hydrographic Organization, the lowest tide level that can be predicted to occur under average meteorological conditions and under any combination of astronomical condit MORE