Presenter: Thomas Maddock III, Department of Hydrology, University of Arizona.
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Maddock, III, Thomas

Colorado Law

University of Colorado Law School Colorado Law Scholarly Commons Groundwater in the West (Summer Conference, June 16-18) 2004 6-16-2004 SLIDES: Groundwater-Surface Water Interactions Thomas Maddock, III Follow this and additional works at: https://scholar.law.colorado.edu/groundwater-in-west  Part of the Hydrology Commons, Natural Resources and Conservation Commons, Natural Resources Management and Policy Commons, and the Water Resource Management Commons Citation Information Maddock, III, Thomas, "SLIDES: Groundwater-Surface Water Interactions" (2004). Groundwater in the West (Summer Conference, June 16-18). https://scholar.law.colorado.edu/groundwater-in-west/4 Reproduced with permission of the Getches-Wilkinson Center for Natural Resources, Energy, and the Environment (formerly the Natural Resources Law Center) at the University of Colorado Law School.     Thomas Maddock III, Groundwater-Surface Water Interactions, in GROUNDWATER IN THE WEST (Natural Res. Law Ctr., Univ. of Colo. Sch. of Law, 2004).  Reproduced with permission of the Getches-Wilkinson Center for Natural Resources, Energy, and the Environment (formerly the Natural Resources Law Center) at the University of Colorado Law School.  Groundwater - Surface Water InteractionsThomas Maddock IIIDepartment of HydrologyUniversity of Arizona  Capture 1Capture 2CONCEPT OF CAPTURE“Under natural conditions…previous to the development of wells, aquifers are in a state of approximate dynamic equilibrium.”PRE-DEVELOPMENT DRCapture 3Average recharge R = Average discharge DCONCEPT OF CAPTUREPre-development Recharge and DischargeRecharge: Discharge:Losing streamUnderflow inMountain front rechargeGaining streamUnderflow outEvapotranspirationCapture 4CONCEPT OF CAPTURE“Di h  b  ll  i  th    di h  i d   sc arge y we s s us a new sc arge super mpose upon apreviously stable system, and it must be balanced by an increase in recharge of the aquifer, or a decrease in the old natural discharge, or by a loss of storage in the aquifer, or by a combination of these.” Stress Q is introducedDEVELOPMENTD-∆DQR+∆RThe system may respond in three different ways: increase in recharge R→R+ ∆Rdecrease in discharge D→D− ∆DCapture 5change in aquifer storage ∆SCONCEPT OF CAPTUREThere is a new equilibrium:remembering( ) ( ) SR R D D Q tΔ+ Δ − −Δ − = ΔgivesR D=SR D Q tΔΔ + Δ − = Δthe term ∆R+∆D is called capture.Capture 6CONCEPT OF CAPTUREStreamEvapotranspirationCapture 7Reduced water tableCapture 8Capture Is Calculated with Models     • There will be a surface water model and a         groundwater model.• There will be a historical model and a base         case model.• The models will consist of control      variables, state variables and parameters.• There is no capture data values to       compare or calibrate with calculated values.Capture 9MODEL CHARACTERISTICS • Surface water model is one-di i lmens ona• Groundwater model is distributed parameter (Two or Th Di i l)ree mens ona• Interaction between surface and ground- waters if governed by Darcy’s law S AH H−Q KWLM=Capture 10HISTORICAL MODEL • Attempts to match historical processes    • Can be calibrated with temporal and spatial data • Used to demonstrate the viability, d b t f th d laccuracy an  ro us ness o  e mo e• Does not calculate capture.Capture 11BASE MODEL • Based on little or no data      • May be fictional or artificial in natureM b th lt f ti ti• ay e e resu  o  a nego a on process• Should be composed of the same physical based parameters as the historical modelExamples: Steady State, Steady Oscillatory, Constrained ProcessCapture 12S bt ti th hi t i l t flu rac ng e s or ca  s ream ows from the base streamflows provides an estimate of surface water capture by groundwater pumping.Capture 13PARAMETERS• Physically or scientifically based parameters –A t l tc ua  measuremen s• Calibration or Ad Hoc parameters – No t ( b d )measuremen s or oun s• Calibration of the models’ physically based parameters provides a measure of the natural       error of the model.• Calibration or Ad Hoc parameters mask the       natural error of the model and may improperly influence the Base ModelCapture 14CONCEPT OF CAPTURECapture 15CONCEPT OF CAPTUREFlow between stream and aquifer at selected locations1.5100.5cfs-0.5-11940 1945 1950 1955 1960 1965 1970 1975 1980 1985 1990YearsCapture 16Near Palaminas Near Hereford Near lewis Springs Near Charl. Bridge

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SLIDES: Groundwater-Surface Water Interactions

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https://scholar.law.colorado.edu/cgi/viewcontent.cgi?article=1003&context=groundwater-in-west

SLIDES: Groundwater-Surface Water Interactions

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