Lecture 26 Apr 2 2008 Hydrogeology Part 2

Lecture 26 Apr 2 - Typically we pump out the groundwater that we need In the case of excessive withdrawal the water table can be lowered Shown here

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Unformatted text preview: Typically, we pump out the groundwater that we need. In the case of excessive withdrawal, the water table can be lowered. Shown here is a local cone of depression. The water table can be lowered over a whole region if pumping and withdrawal outpace recharge by rainfall and infiltration. The geology of the subsurface can be complex. Differences in permeability can cause groundwater to perch above the regional water table. Layers of low permeability can confine an aquifer. In a confined aquifer, the water can be under pressure. Putting a number of elements of a heterogeneous geological subsurface together makes for a complex distribution of groundwater resources. All sources of drinking water contain some naturally occurring dissolved chemicals. Water is a good solvent Rocks and minerals dissolve to some extent in water Human activities can introduce undesirable contaminants to water supplies. There are chemicals dissolved in water! There are chemicals dissolved in water! Most contaminants of concern are related to human activities of agriculture, industry, transportation, and waste disposal . There are relatively few natural geological sources of contaminants. Contaminants in Water Common agricultural practices include the application of fertilizers, herbicides, and pesticides....
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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 26 Apr 2 - Typically we pump out the groundwater that we need In the case of excessive withdrawal the water table can be lowered Shown here

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