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Cartographers can link to or download the NHD to use in their computer mapping software. The NHD is used to represent surface water on maps and is also used to perform geospatial analysis. It is a digital vector geospatial dataset designed for use in geographic information systems (GIS) to analyze the flow of water throughout the nation. The ...
Kaggle is a data science competition platform and online community for data scientists and machine learning practitioners under Google LLC.Kaggle enables users to find and publish datasets, explore and build models in a web-based data science environment, work with other data scientists and machine learning engineers, and enter competitions to solve data science challenges.
The development of GMS was funded primarily by The United States Army Corps of Engineers and was known until version 4.0, released in late 1999, [3] as the Department of Defense Groundwater Modeling System, or DoD GMS.
The source code is free public domain software, [1] written primarily in Fortran, and can compile and run on Microsoft Windows or Unix-like operating systems. 3-dimensional grid. Since its original development in the early 1980s, [2] the USGS has made six major releases, and is now considered to be the de facto standard code for aquifer simulation.
Groundwater is water located beneath the earth's surface in pores and fractures of soil and rocks. [6] Hydraulic head (or piezometric head) is a specific measurement of the potential of water above a vertical datum. [7] It is the height of the free surface of water above a given point beneath the surface. [4]
The availability of non-open scientific data decays rapidly: in 2014 a retrospective study of biological datasets showed that "the odds of a data set being reported as extant fell by 17% per year" [122] Consequently, the "proportion of data sets that still existed dropped from 100% in 2011 to 33% in 1991". [65]
HydroGeoSphere (HGS) is a 3D control-volume finite element groundwater model, and is based on a rigorous conceptualization of the hydrologic system consisting of surface and subsurface flow regimes. [ 1 ] [ 2 ] The model is designed to take into account all key components of the hydrologic cycle .
The energy balance of groundwater flow can be applied to flow of groundwater to subsurface drains. [2] The computer program EnDrain [3] compares the outcome of the traditional drain spacing equation, based on Darcy's law together with the continuity equation (i.e. conservation of mass), with the solution obtained by the energy balance and it can be seen that drain spacings are wider in the ...