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WOU ES 106 - Water Cycle, Groundwater

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Water Cycle, Groundwater Hydrologic CycleDistribution/Cycle AnimationWater CycleWater CycleWater CycleWater DistributionGroundwaterWater sources in OregonGroundwaterGroundwater SourceGroundwater TermsGroundwater terms diagramGroundwater Storage Groundwater StorageGroundwater MovementGroundwater movement diagramSpringsWellsWells after drawdownArtesian wellsOgallala supported agricultureOgallala AquiferSan Joaquin Valley subsidenceGroundwater purificationGroundwater purificationAgriculture sources of groundwater contaminationLandfill leachate contaminationDrinking Water StandardsParts per MillionPrimary sewage treatmentSecondary sewage treatmentSewage treatmentPhoto of cliff springsCarlsbad CavernsArecibo, Puerto Rico: Radio Telescope in SinkholeKarst drainage of manmade lake in MissouriKarst towering buttesThailand Karst TowersHot SpringsGeysersOld Faithful photoGeyser EruptionGeyser eruption stagesWater Cycle, GroundwaterHydrologic Cyclehttp://www.mnforsustain.org/water_climate_global_water_cycle_study.htmDistribution/Cycle AnimationWater Cycle• 86% of evaporation from sea surface• 14% of atmospheric moisture from EVAPOTRANSPIRATION• 78% of precipitation on sea surface• 22% of water precipitated falls on land http://meted.com/mesoprim/mpradfog/print.htmWater CycleWater Cycle• Less that 3% of Earth’s water is on land• Over ¾ of that is in glacial ice• Most of the rest is stored as groundwater– (some groundwater is saline)Water DistributionGroundwater• Precipitation infiltrates Earth’s surface• Largest reservoir of liquid fresh water• Drinking water source for half of U.S.Water sources in Oregonhttp://www.deq.state.or.us/wq/dwp/dwp.htmGroundwaterSurface waterGroundwater• Contributes to stream flow• ‘Universal solvent’• Dissolves some rock types– Limestone (CaCO3)– Salts (NaCl, KCl)– Gypsum (CaSO4)Groundwater Source• First becomes ‘soil moisture’– Plants use it– Some evaporates directly– Some sinks down• Infiltration• ‘Groundwater’ is storedGroundwater Terms• Zone of saturation• Water table• Zone of aerationGroundwater terms diagramGroundwater Storage • Porosity of rock– Spaces between sand grains– Cracks in crystalline rock– Dissolved cavities• Permeability– Allows water to move– Interconnection of pore spaces• Stored in AQUIFER– Porous and permeable rock• Trapped by AQUITARD– Impermeable rock– Clay, shaleGroundwater StorageGroundwater Movement• Very slowly—– Small openings– High surface tension• Pressure forces water to areas of lower pressure– Hydraulic gradient– Hydraulic headGroundwater movement diagramSprings• Where water table intersects ground surfaceWellsWells after drawdownArtesian wellsOgallala supported agricultureOgallala Aquifer• Exploited in Great Plains agriculture• Water table dropped• Recharge rate lowSan Joaquin Valley subsidenceNot able torecover dueto aquifercompactionGroundwater purificationGroundwater purificationAgriculture sources of groundwater contaminationLandfill leachate contaminationDrinking Water StandardsParts per Million• ppm• Change 1,000,000 mg to litersmg 1,000,000mg 1L 1mL 1,000L 1g 1mL 1mg 1,000g 1mg 1,000,000 =×××L 1mg 1ppm 1 =Primary sewage treatmentSecondary sewage treatmentSewage treatmentPhoto of cliff springsCarlsbad CavernsArecibo, Puerto Rico: Radio Telescope in SinkholeKarst drainage of manmade lake in MissouriKarst towering butteshttp://en.wikipedia.org/wiki/YangshuoThailand Karst Towershttp://www.siue.edu/GEOGRAPHY/ONLINE/Gillespie.htmHot Springs• Water heated by hot rock (cooling magma)• Temperature increases solvent capabilities• May contain acids from magmatic waterGeysers• Special type of hot spring• Pressure of water column suppresses boiling• Heat added eventually overcomes pressure• Sudden rise of water, increase pressure release on risingOld Faithful photoOld Faithfulwebcam linkhttp://www.nps.gov/archive/yell/oldfaithfulcam.htmGeyser EruptionGeyser eruption


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WOU ES 106 - Water Cycle, Groundwater

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