Hydrographic Surveying
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Definition:
It is the branch of surveying which deals with any body of still or running water such as a lake, harbor, stream or river. Hydrographic surveys are used to define shore line and under water features.
Objects of Hydrographic Surveying:
Hydrographic surveying are carried out for one or more of the following activities.
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Why we need Hydrographic Surveys – Uses & Applications of Hydrographic Survey
Establishing Horizontal and Vertical Controls (Click Here)
The first step in making a hydrographic survey is to control both horizontal and vertical.
Horizontal Controls:
In an extensive survey, the primary horizontal control is established primarily by running theodolite and tape traverse before the triangulation station. Tthe traverse lines being run to following the shore lines approximately. In survey of less extent the primary horizontal control only is required and is established by running a theodolite and tape traverse sufficiently close to shore line. For rough work, the control may be established by running a theodolite and staid traverse or plane table trader.
Vertical Controls:
These are based upon a series of bench marks established near the shore line by spirit leveling and these serve for setting and checking tide gages etc to which the sounding are referred.
River Surveying
The survey of the shore line of a river is made by running a theologize and tape traverse on a shore at a convenient distance form the edge of the water. If the river is narrow, a single theologize and tape traverse is on one bank and both banks. Located by staid or plane table methods.
Sounding Surveying
The measurements of depths below the water surface is called Sounding. The object of making soundings is to determine the configuration of the bottom of the body of water. This is done by measuring form the boat, the depth of water at various points
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