Automated well permitting. Application of Arc Hydro Groundwater and MODFLOW Analyst. 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 is analyzed using MODFLOW. Overview.
Application of Arc Hydro Groundwater and MODFLOW Analyst
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 is analyzed using MODFLOWOverview
Step 1: “baseline” model User applies for a new well (coordinates, pumping rate, screen elevations).
Create a new feature in the Well feature classCandidate Well Analysis
New Well (HydroID = 1001)
Step 2 “baseline” model: Create new instances in the WEL table.Candidate Well Analysis
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
Step 3: “baseline” model Export the new well data to the MODFLOW text fileCandidate Well Analysis
Step 4: “baseline” model Run MODFLOW simulation with candidate well
Use OBS process to compute new flows at rivers, drains, etc.
Export drawdown file as part of solution.Candidate Well Analysis
Step 5: “baseline” model Read solution and compare to “base” simulationCandidate Well Analysis
Permitting criteria based on impact to streams, springs, etc.
Create new well update well table export well package file run MODFLOW import solution build map layers
Location of candidate well
Virginia Coastal Plain Model (VCPM) “baseline” model
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 ftCase Study #2 – Virginia DEQ
Heads for layer 8
Create new well update well table export well package file run MODFLOW import solution build drawdown map layer
Area of Impact Cells
Area of Impact Contour