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Water table - Wikipedia ... Water table
Chart datum - Wikipedia ... Chart datum
Nautical chart - Wikipedia ... Nautical chart
Bathymetry - Wikipedia ... Bathymetry
General Bathymetric Chart of the Oceans
Water distribution on Earth
Watertable control. In geotechnical engineering, watertable control is the practice of controlling the height of the water table by drainage. Its main applications are in agricultural land (to improve the crop yield using agricultural drainage systems) and in cities to manage the extensive underground infrastructure that includes the ...
Charts often showed a great deal of detail of features on land as well as sea. Depths were shown by individual soundings while hills and mountains were shown by hatch marks. Printing was in black and white, but some charts were hand-coloured, either to emphasise water depth or terrain, or to indicate specific features such as lighthouses.