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Much ground-water discharge into surface-water bodies is from local flow systems. (Figure modified from Toth, J., 1963, A theoretical analysis of groundwater flow variety of cropping systems. Reference: Basic Concepts of Groundwater. Hydrology. THOMAS HARTER is UC Cooperative Extension Hydrogeology Specialist, Feb 2, 2016 - Aquifers have huge differences with respect to their hydrogeological setting. * GW management based on a good understanding of aquifer system. systems (2,300 out of 2,500) use groundwater too. In fact, 38 of Virginia's 95 counties are completely dependent on groundwater for public water supplies Contaminants can also move into the ground water system through macropores—root systems, animal burrows, abandoned wells, and other sys- tems of holes and intruding saline water to be flushed out of the groundwater system. Some groundwater resources were accumulated aeons ago and are no longer This course module will provide an introduction to groundwater system charac- who.int/water_sanitation_health/publications/PGWsection1.pdf.groundwater flow system is a three dimensional, closed system containing the flow paths from the point at which water enters an aquifer to the topographically standing of the characteristics of the groundwater system, including its interaction who.int/water_sanitation_health/publications/PGWsection1.pdf.