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  2. Hydrogeology - Wikipedia

    en.wikipedia.org/wiki/Hydrogeology

    US Geological Survey water resources homepage — a good place to find free data (for both US surface water and groundwater) and free groundwater modeling software like MODFLOW. US Geological Survey TWRI index — a series of instructional manuals covering common procedures in hydrogeology. They are freely available online as PDF files.

  3. Hydrographic survey - Wikipedia

    en.wikipedia.org/wiki/Hydrographic_survey

    Hydrographic survey is the science of measurement and description of features which affect maritime navigation, ... (Survey Fleet) Hydro International ...

  4. Hydrologic unit system (United States) - Wikipedia

    en.wikipedia.org/wiki/Hydrologic_unit_system...

    For the use of hydrologists, ecologists, and water-resource managers in the study of surface water flows in the United States, the United States Geological Survey created a hierarchical system of hydrologic units. Infographic explaining the hierarchy of the United States hydrologic unit system

  5. Hydrogeophysics - Wikipedia

    en.wikipedia.org/wiki/Hydrogeophysics

    Hydrogeophysics is a cross-disciplinary area of research that uses geophysics to determine parameters (characteristics; measurements of limitations or boundaries) and monitor processes for hydrological studies of matters such as water resources, contamination, and ecological studies. [1]

  6. Geological survey - Wikipedia

    en.wikipedia.org/wiki/Geological_survey

    A geological survey is the systematic investigation of the geology beneath a given piece of ground for the purpose of creating a geological map or model.Geological surveying employs techniques from the traditional walk-over survey, studying outcrops and landforms, to intrusive methods, such as hand augering and machine-driven boreholes, to the use of geophysical techniques and remote sensing ...

  7. Hydrology - Wikipedia

    en.wikipedia.org/wiki/Hydrology

    Rain falling over a drainage basin in Scotland.Understanding the cycling of water into, through, and out of catchments is a key element of hydrology. Hydrology (from Ancient Greek ὕδωρ (húdōr) 'water' and -λογία () 'study of') is the scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and ...

  8. United States Geological Survey - Wikipedia

    en.wikipedia.org/.../United_States_Geological_Survey

    United States Geological Survey marker on the summit of Maiden Peak (Washington) While much less expensive to compile and produce, the revised digital U.S. topo maps have been criticized for a lack of accuracy and detail in comparison to older generation maps based on aerial photo surveys and field checks. [ 34 ]

  9. GIS and hydrology - Wikipedia

    en.wikipedia.org/wiki/GIS_and_hydrology

    The United States Geological Survey ((USGS)) is a publicly available source of remotely sensed hydrological data. Historical and real-time streamflow data are also available via the internet from sources such as the National Weather Service (NWS) and the United States Environmental Protection Agency (EPA).