The phrase "a hydrographic" is correct and usable in written English.
It can be used when referring to something related to hydrography, such as a study, survey, or map that deals with the measurement and description of the physical features of bodies of water.
Example: "The researchers conducted a hydrographic survey to gather data on the underwater topography of the lake."
Alternatives: "a hydrological" or "a water-related".
After several years' service, it was refitted as a hydrographic survey vessel and subsequently placed under the command of Robert Fitzroy.
In a hydrographic perspective, the Bangladesh region has complex network of waterways, and bottom topography have several detached shoals.
Information on it is contained in the Kniga bolshomu chertyozhu (1627; "Book of the Great Chart") and in a hydrographic description of 1636.
The scale of a hydrographic chart expresses the relationship between a given distance on the chart and the actual distance it represents on Earth's surface.
It has been a vital artery in Russian history since the days of Peter I the Great, who initiated a hydrographic survey of its course.
Marshal Sergeyev then ordered the navy to send a "hydrographic vessel with more powerful equipment" to search for the mystery ship near the Kursk, "but this object was not found".
This chapter presents the requirements and design for a new hydrographic survey vessel for the Royal Netherlands Navy RNLNNavy RNLN
Several Nansen bottles are employed during a single hydrographic cast, each bottle releasing another messenger when tripped, in order to trigger the deeper bottles in turn.
This paper demonstrates that geochemistry is useful for the identification of sediment origin and provenance in alluvial plains characterised by a complex hydrographic evolution.
It indicates a steady hydrographic feature of Changjiang in the past decades.
Thus, the confluence of the Malvinas and Brazil currents, together with the abundant terrestrial runoff of Río de la Plata, and the relatively shallow waters of the area, combine to produce a singular hydrographic system [53].
