Edward’s Aquifer Ground-water Flow Model Texas Ground Water 2004 November 19, 2004 George B. Ozuna.

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Presentation transcript:

Edward’s Aquifer Ground-water Flow Model Texas Ground Water 2004 November 19, 2004 George B. Ozuna

Edwards Aquifer Model In cooperation with:  Edwards Aquifer Authority  Department of Defense  USGS Richard Lindgren, USGS Sue Horvorka and Alan Dutton, BEG Scott Painter, SwRI Steve Worthington, Consultant

Edwards Aquifer Model Uniform ¼-mi grid 370 rows; 700 columns; 259,000 cells One layer Grid alignment:  Major faults and flow near Comal and San Marcos Springs

Structure Aquifer top elevation Aquifer bottom elevation Faults Provided by BEG – Sue Horvorka

Faults Simulated using Horizontal Flow Barrier Package Model inputs:  fault location  hydraulic characteristic (C) ohydraulic conductance term oAssumption: hydraulic characteristic (C) is a function of fault displacement inversely proportional

Las Moras Springs Leona Springs San Antonio & San Pedro Springs Comal Springs San Marcos Springs Fault Simulated Faults And Springs

General-head boundary No-flow boundary – saline water line General-head boundary No- flow Colorado River – Head-dependent flux boundary No- flow Recharge zone Model Boundary Conditions

Hydraulic Conductivity Provided by Southwest Research – Scott Painter

Conduits Provided by EAA Consultant - Steve Worthington

Hydraulic Properties

Simulated Recharge Zones

Recharge Zone - Stream Channels

Pumpage – by use Provided by BEG – Alan Dutton

Pumpage – by rate Provided by BEG – Alan Dutton

Steady-State Calibration Calibration period: 1939 – 1946 Pre-1950’s drought, minimal irrigation development Near-normal precipitation San Antonio precipitation: normal in/yr average in/yr

Steady-State Target Wells 144 wells

Steady-State Calibration

Transient Calibration Calibration period: 1947 – 2000 Calibration targets:  Long-term record wells oCounty Index wells omatch hydrographs  Selected time periods operiods of above- and below-normal precipitation omatch hydraulic heads for a set of wells

Transient Calibration Selected time periods  Below-normal precipitation o May thru November wells  Above-normal precipitation o November 1974 thru July wells

Transient Target Wells Drought Conditions, 175 Wells, May – November 1956

Transient Target Wells Wet Conditions, 172 Wells, November 1974 – July 1975

Transient Target Springs 5 springs simulated:  San Marcos  Comal  Leona  San Pedro*  San Antonio* *Based on relation with Bexar index well

Uvalde Index Well Medina Index Well Comal Well San Marcos Well Transient Results Water-Level Hydrographs Bexar Index Well

Transient Results Water-Level Hydrographs

Leona Springs Comal Springs San Marcos Springs Transient Results Springflow Hydrographs

Edwards Aquifer Model Model Inputs  Structure  Boundary Conditions  Hydraulic Properties  Stresses Model Calibration  Targets  Steady-State Results  Transient Results