hha_feb2 - Wednesday Feb 2 Quiz 3 Groundwater Flow wells...

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1 Wednesday Feb 2 - Quiz 3 Groundwater Flow, wells, maps start HW#2 (due Feb 9) Monday Feb 7 th and Weds 9 th : I will be out of town. Amy will teach classes on groundwater chemistry and groundwater tracers. Wells Purposes: – Water level monitoring (sometimes called a piezometer) – Sampling (water quality) Water supply http://www.fao.org/docrep/X5567E/x5567e05.htm Constructing wells • Drilling Hand digging well screen and gravel pack Above screen and gravel pack: bentonite seal and cement Wells installed in rock – Can have open borehole rather than screen and gravel pack
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2 Wells in confined aquifers: – Avoid connecting aquifers across confining layers – Multiple casing levels Horizontal wells well development remove fine material with back and forth water motion through screen Pumping from wells – when an aquifer is pumped, the potentiometric surface drops around the well (drawdown), making a cone of depression Why a cone?
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