Lecture 25 Mar 31 2008 Hydrogeology

Lecture 25 Mar 31 2008 Hydrogeology - About 70 of Earth is...

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Unformatted text preview: About 70% of Earth is covered with water. The hydrologic cycle describes the movement of water. The distribution of water on Earth shows that most water is not fresh, liquid water. The most accessible sources of fresh water for human consumption are rivers and lakes. The largest volume of fresh water for human consumption is groundwater. We use groundwater in a variety of ways. We drink groundwater! This depiction of the hydrologic cycle has a more realistic representation of subsurface flow. Infiltration replenishes the groundwater. The infiltrating water “recharges” the groundwater. Porosity is the pore space that may hold fluid. There is more porosity in a well sorted sand than in a poorly sorted sand. The pores are not as numerous or as well connected in a cemented sandstone. The water table is the boundary between the unsaturated zone typical of soils and shallow bedrock and the saturated zone typical of deeper formations. Different rock types have different types of porosity. Permeability is the ability of a formation (soil, sediments, or rock) to allow fluids to pass through pores or cracks.rock) to allow fluids to pass through pores or cracks....
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This note was uploaded on 04/11/2008 for the course EVSC 280 taught by Professor Herman during the Spring '08 term at UVA.

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Lecture 25 Mar 31 2008 Hydrogeology - About 70 of Earth is...

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