Groundwater Occurrence & Movement: Groundwater Occurrence & Movement: An Introductory Discussion with Application to An Introductory Discussion with Application to Northeastern Illinois Northeastern Illinois H. Allen Wehrmann, P.E., Director Center for Groundwater Science Illinois State Water Survey April 24, 2007
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Groundwater Occurrence & MovementGroundwater Occurrence & Movement: An Introductory Discussion with Application to Northeastern Illinois H. Allen Wehrmann, P.E., Director Center for
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Groundwater Occurrence & Movement:Groundwater Occurrence & Movement:An Introductory Discussion with Application to An Introductory Discussion with Application to
Northeastern IllinoisNortheastern Illinois
H. Allen Wehrmann, P.E., DirectorCenter for Groundwater Science
Illinois State Water Survey
April 24, 2007
AcknowledgmentsAcknowledgments
Martin Jaffe, University of Illinois, ChicagoMartin Jaffe, University of Illinois, ChicagoScott Meyer, Center for GW Science, ISWSScott Meyer, Center for GW Science, ISWSSteve Burch, Center for GW Science, ISWSSteve Burch, Center for GW Science, ISWSIL State Geological SurveyIL State Geological SurveyKane County Water Resources DepartmentKane County Water Resources Department
Topical Presentation OutlineTopical Presentation OutlineBasic Concepts and DefinitionsBasic Concepts and Definitions
The Hydrologic CycleThe Hydrologic CycleWhat is groundwater?What is groundwater?
Concepts & DefinitionsConcepts & DefinitionsPorous Flow vs. Fractured FlowPorous Flow vs. Fractured FlowAquifers vs. Aquifers vs. AquitardsAquitardsArtesian vs. Water Table ConditionsArtesian vs. Water Table Conditions
An aquifer is a saturated bed, formation, or group of formations which yields water in sufficient quantityto be of consequence as a source of supply.
An aquitard yields inappreciable quantities of water to wells compared to an aquifer but through whichleakage of water is possible. Aquitards often act as confining beds.
Unconfined vs. Confined GroundwaterUnconfined vs. Confined Groundwater
An unconfined aquifer is one in which groundwaterpossesses a free surface open to the atmosphere.The upper surface of the zone of saturation is calledthe water table.
A confined aquifer is one in which groundwater isconfined under pressure by overlying and underlyingaquitards or aquicludes and water levels in wells riseabove the top of the aquifer. Also called an artesianaquifer.
Groundwater Flow Groundwater Flow Modeling: NE IllinoisModeling: NE IllinoisRegional Model GridRegional Model Grid
226 rows226 rows174 columns174 columns18 layers18 layers707,832 nodes707,832 nodesMinimum grid Minimum grid spacing of 2500spacing of 2500’’Maximum grid Maximum grid spacing of 80,000spacing of 80,000’’
Modeled Heads in upper GalenaModeled Heads in upper Galena--Platteville Platteville -- 20022002
Modeled Heads in lower GalenaModeled Heads in lower Galena--Platteville Platteville -- 20022002
Modeled Heads in Modeled Heads in AncellAncell (St. Peter) (St. Peter) -- 20022002
Modeled Heads in IrontonModeled Heads in Ironton--Galesville Galesville -- 20022002
Look for more information and updates:http://www.sws.uiuc.edu/wsp