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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.

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Automated well permitting
Automated well permitting

Application of 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 is analyzed using MODFLOW

Overview


Candidate well analysis

Step 1: “baseline” model 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 analysis1

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


Candidate well analysis2

Step 3: “baseline” model Export the new well data to the MODFLOW text file

Candidate Well Analysis


Candidate well analysis3

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


Candidate well analysis4

Step 5: “baseline” model Read solution and compare to “base” simulation

Candidate Well Analysis

  • 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).


Case study 1 srwmd
Case Study #1 - SRWMD “baseline” model

Permitting criteria based on impact to streams, springs, etc.


Well analysis workflow
Well Analysis Workflow “baseline” model

Create new well  update well table  export well package file  run MODFLOW  import solution  build map layers


Case study 1 srwmd1
Case Study #1 - SRWMD “baseline” model

Location of candidate well


Drawdown resulting from well
Drawdown resulting from well “baseline” model


Changes in flows to sources sinks
Changes in flows to sources/sinks “baseline” model


Case study 2 virginia deq

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 ft

Case Study #2 – Virginia DEQ

Heads for layer 8


Well permitting workflow
Well Permitting Workflow “baseline” model

Create new well  update well table  export well package file  run MODFLOW  import solution  build drawdown map layer


Products
Products “baseline” model

Area of Impact Cells

Area of Impact Contour


Gis products
GIS Products “baseline” model


Well permitting workflow demo
Well permitting workflow demo “baseline” model


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