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Automated well permitting

Automated well permitting. Application for Arc Hydro Groundwater and MODFLOW Analyst. Overview. Calibrated regional model is imported to ArcGIS as a “baseline” model Candidate wells are added to baseline model using well package.

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Automated well permitting

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  1. Automated well permitting Application for Arc Hydro Groundwater and MODFLOW Analyst

  2. Overview • Calibrated regional model is imported to ArcGIS as a “baseline” model • Candidate wells are added to baseline model using well package. • Impact of new well (changes in streamflows, drawdown, etc.) is analyzed using the MODFLOW OBS process, and standard model outputs • Wells can be accepted or rejected and database is updated automatically

  3. Model Preparation • Prepare calibrated model • Establish Flow Observations • Import calibrated model into the ArcGIS • Read solution files and set a model “baseline” to which future runs will be compared Drain feature The MODFLOW OBS process is used to compare baseline flow with simulated flows. Output heads are copied to starting heads to facilitate drawdown calculations

  4. Candidate Well Analysis • Step 1: User applies for a new well (coordinates, pumping rate, screen elevations). • Create a new feature in the Well feature class New Well (HydroID = 1001)

  5. Candidate Well Analysis • Step 2: Create new instances in the WEL table. Custom tool that creates MODFLOW instances based on the location of the well and the screen elevations and finds the appropriate MODFLOW cell. CellID represents MODFLOW i, j, k values SourceID is the HydroID of the well feature

  6. Candidate Well Analysis • Step 3: Export the new well data to the MODFLOW text file

  7. Candidate Well Analysis • Step 4: Run MODFLOW simulation with candidate well • Use OBS process to compute new flows and rivers, drains, etc. • Export drawdown file as part of solution.

  8. Candidate Well Analysis • Step 5: Read solution and compare to “base” simulation • Generate appropriate reports to guide well approval/rejection. • There can be a number of different criteria for comparison: • Changes in flows (observed vs. simulated equivalents) at key features. • Drawdown at key locations. • Drawdown maps • Capture zones (using MODPATH).

  9. Case Study #1 - SRWMD Permitting criteria based on impact to streams, springs, etc.

  10. Well Analysis Workflow Create new well  update well table  export well package file  run MODFLOW  import solution  build map layers

  11. Case Study #1 - SRWMD Location of candidate well

  12. Drawdown resulting from well

  13. Changes in flows to sources/sinks

  14. Case Study #2 – Virginia DEQ • Virginia Coastal Plain Model (VCPM) • 10-layer MODFLOW model used to analyze impacts of candidate wells • Criteria based on state law • Potentiometric surface cannot fall below a critical surface (80% drawdown) • Area of Impact defined by drawdown = 1 ft Heads for layer 8

  15. Well Permitting Workflow Create new well  update well table  export well package file  run MODFLOW  import solution  build drawdown map layer

  16. Products Area of Impact Cells Area of Impact Contour

  17. Arc Hydro Groundwater Automated well permitting demo

  18. For more information http://www.archydrogw.com (AHGW Wiki page) http://www.aquaveo.com/archydro (Info on tools) Norm Jones njones@byu.edu 801-422-7569 Jeff Davis jdavis@aquaveo.com 801-835-7445

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