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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.
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
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
Model Preparation
The MODFLOW OBS process is used to compare baseline flow
with simulated flows.
Drain feature
Observation name
Observed value
Simulated value
Drain_Time1 100 99
Drain_Time2 120 119
Drain_Time3 125 126
Drain_Time4 130 130
Drain_Time5 130 129
Output heads are copied to starting heads to facilitate drawdown
calculations
Step 1: User applies for a new well (coordinates, pumping rate, screen elevations).
Create a new feature in the Well feature class
Candidate Well Analysis
New Well (HydroID = 1001)
Candidate Well Analysis
Step 2: Create new instances in the WEL table.
CellID represents MODFLOW i, j, k values
SourceID is the HydroID of the well feature
Custom tool that creates MODFLOW instances based on the location of the well and the screen elevations and finds the appropriate MODFLOW cell.
Candidate Well Analysis
Step 3: Export the new well data to the MODFLOW text file
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.
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:o Changes in flows (observed vs. simulated equivalents) at
key features.o Drawdown at key locations.o Drawdown mapso Capture zones (using MODPATH).
Case Study #1 - SRWMD
Permitting criteria based on impact
to streams, springs, etc.
Well Analysis Workflow
Create new well update well table export well package file run MODFLOW import solution
build map layers
Case Study #1 - SRWMD
Location of candidate
well
Drawdown resulting from well
Changes in flows to sources/sinks
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
Well Permitting Workflow
Create new well update well table export well package file run MODFLOW import solution build drawdown map layer
AUTOMATED WELL PERMITTING DEMO
Arc Hydro Groundwater
Products
Area of Impact Cells Area of Impact Contour
GIS Products
GIS Products
For more information
Norm [email protected]
http://www.archydrogw.com (AHGW Wiki page)http://www.aquaveo.com/archydro (Info on tools)
