Lecture27 - Quote of Day hat you do when no one is watching...

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Unformatted text preview: Quote of Day hat you do when no one is watching is a measure of your integrity. Groundwater Springs ¾ Occur where the water table intersects Earth’s surface ¾ Natural outflow of groundwater ¾ Can be caused by an aquitard creating a perched water table ¾ Can be the outlet of a karst system (i.e., caves) Figure 17.8 Cold and hot springs Cold springs • Water is average ambient temperature of locality • Missouri springs are cold springs Hot springs • Water is warmer than mean annual air temperature of locality • Water for many hot springs is heated by hot igneous rock Figure 17.9 Hot springs and geysers in U.S. Figure 17.12 Mammoth Hot Springs (Yellowstone) Geysers Geysers • Intermittent hot springs • Water erupts with great force • Groundwater heats, expands, changes to steam, and erupts Figure 17.10 Norris basin (Yellowstone) Old Faithful http://ijolite.geology.uiuc.edu/NatlParks/Yellowstone/yellow-list1.html igure 17.11 Water cycle of many geysers Wells in Unconfined Aquifers To ensure a continuous supply of water, a well must penetrate below the water table Pumping of wells can cause • Drawdown (lowering) of the water table • Cone of depression in the water table • These wells can deliver a lot of water! Figure 17.13 Funnel / cone http://jon-doninc.com/catalog/images/images_300/MI-F-EA.jpg ¾ Wells in confined aquifers can deliver a lot of clean, fresh water. Only problem is that the recharge rate of confined aquifers is low (slow). ¾ Artesian well is a situation in which groundwater under pressure rises above the level of the aquifer in a well ¾ Types of artesian wells • Nonflowing – pressure surface is below ground level • Flowing – pressure surface is above the ground Wells in Confined Aquifers Figure 17.15 Figure 17.16 Artesian water well in S. Dakota Problems associated with groundwater withdrawal ¾ Treating groundwater as a nonrenewable resource • In many places the water available to recharge the aquifer falls significantly...
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This note was uploaded on 04/18/2011 for the course EAS 101 taught by Professor Kirschner during the Spring '11 term at Saint Louis.

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Lecture27 - Quote of Day hat you do when no one is watching...

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