ch15_2302 - Fresh Water of the Continents Ground Water...

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Fresh Water of the Continents Ground Water Limestone Solution by Ground Water Problems of Ground Water Management Surface Water Stream Flow Lakes Surface Water as a Natural Resource
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Fresh Water of the Continents the hydrologic cycle of water from the oceans and the continents to the atmosphere through evapotranspiration; back to the ocean and continent surfaces through precipitation and eventually returning to the oceans through surface runoff (rivers) after storage (lakes, ground water, ice sheets) water Figure 15.1, p. 513
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Ground Water when precipitation reaches the ground, it either runs off or infiltrates into the soil - as runoff, it flows into streams - as infiltration, it either returns to the air through evapotranspiration or seeps downward to become ground water Figure 15.2, p. 514
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Ground Water zones of subsurface water - water in the soil water belt is available to plants, water in the unsaturated zone percolates downward to the saturated zone of ground water, where all pores and spaces are filled with water Figure 15.3, p. 514
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Ground Water the water table marks the top of the saturated zone of ground water - highest under hilltops and divides, and it slopes to intersect the surface at lakes, marshes, and streams. Figure 15.4, p. 515
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Ground Water an aquifer is a layer of rock or sediment that contains abundant, freely flowing ground water aquicludes are beds of clay and shale which are relatively impermeable and hold little free water a perched water table is an accumulation of water suspended or perched above the main water table by an impermeable lens of rock (usually shale) Figure 15.5, p. 515
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ch15_2302 - Fresh Water of the Continents Ground Water...

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