1. Update on EAA Groundwater Modeling Initiatives Presented by: Geary M
Update on EAA Groundwater Modeling Initiatives Presented by: Geary M. Schindel Jim Winterle Edwards Aquifer Authority

2. Groundwater Modeling Initiatives (1999 - 2004)
GWSIM-IV (<1999)
MODFLOW (2004)
Both are accepted GAMs for TWDB

3. Groundwater Modeling Initiatives (1999 – 2004)
MODFLOW conceptual model issues –
How to model convergent/turbulent flow system using a laminar flow model
No good numerical models for karst
Recharge, dry cells, springs, faults, etc.

4. Groundwater Modeling Initiatives (1999 – 2004)
Model to be used for:
Demand Management/Critical Period Management Issues
Enhanced recharge evaluations
Evaluation of aquifer cap issues
EAHCP
ASR
Spring Augmentation
Recharge and Recirculation

5. Groundwater Modeling Initiatives (2011)
2011 Groundwater Model Initiative
Improve confidence in modeling efforts
Provide additional research tool
Improve model resolutions
MODFLOW
Verification and post audit process
Finite Element initiative
MODFLOW revisions and FEFLOW development were required by HCP

6. MODFLOW Model Status
Verification Analysis was completed in August 2013
Ran existing model using inputs for
Evaluated errors, uncertainties to support recommended model updates
Post-Audit Updates in progress to be completed by December 31, 2014
Revise model boundaries
Update aquifer top and bottom elevations
Update representation of inter-formational flows
Update representation of hydrologic flow barriers
Recalibrate transient simulation using inputs and observations for

7. Finite Element Model Status
Hydrogeologic Framework Model completed in 2013
Recharge, pumping, and observation datasets developed for period
Preliminary model presently undergoing transient calibration
Calibrated model using FEFLOW code expected by September 2014
Draft Final Report, data sets, and model expected by December 2014