Well Input Options

Well Input Options

Well ID and Location

A default name will be assigned to a well based on sequence (first well added gets '1', second well added gets '2', and so on). Use the provided text box to change the name, if desired.

The geographic coordinates (Latitude and Longitude) are automatically populated based on where the well was drawn in the map display. You can change the location by altering one or both of the coordinates in the 'Lat' and 'Long' text boxes.

Pumping and Injection

By default, the pumping rate is equal to zero. To make the well a sink (pumping stress), enter a negative value in the text box next to ‘Pumping Rate:’, or enter a positive value to conceptualize it as an injection well. The value that is entered is used for steady-state pumping (i.e., the rate does not change with time).

To implement a time-varying pumping/injection rate, check the radio box next to ‘Transient’, then click on the ‘Transient’ button

Well Screen Elevation

The default location of the well screen will be centered at a distance from the surface that is two-thirds the depth of the aquifer at that location. The user may specify the screen top elevation and bottom elevation by entering non-zero values (units: meters) in the text boxes next to ‘Screen Top:’ and ‘Screen Bot:’, respectively.

The figure below shows an example of how the well screen would be treated under "default conditions" for a pumping well in an aquifer layer (thickness=B) with six computational layers (K=1,...,6).

Point Source

To use a well feature a point source (e.g., an injection well) of pollutants/solutes, enter a non-zero number in the textbook next to ‘Conc:’ (units: ppm). The value that is entered is used as source concentration for all time steps (i.e., the well functions as a continuous source).

To implement a time-varying source concentration, check the radio box next to the ‘Transient’ button, then click on the ‘Transient’ button. In addition, users may add particles around wells and then performing backward particle tracking to delineate well capture zones. To add particles around a well, check the radio box next to ‘Add Particle’.

Monitoring Wells

The Well Input Options can also to create a monitoring well for tracking simulated head and concentration at the location of the placed well feature. To do so, check the radio box next to ‘Monitoring Well’. When the model is simulated/run forward, a time-series plot for head and/or concentration will be available in the Monitoring Wells Plot chart when analyzing model results with the 'Analysis' button

Check the box next to 'Monitoring Probability' when performing Monte Carlo Simulations. After multiple realizations have been simulated (2 or more), IGW-NET will automatically compute probability statistics at that point location of the placed well when this option is selected.

To include transient head and/or solute concentration observations in the monitoring well plots, check the radio boxes next to ‘Observation H’ and ‘Observation C’ button. To input transient head data, click on the ‘Observation H’ button.

Refined Grid

Check this box to utilize the well feature for refining the numerical grid in the immediate vicinity to resolve details and complexities of interest. Click the 'Edit Grid' button to view or change the refinement parameters.

Click the 'toALL' button if you want to apply refinement (and the refinement parameters) to all wells in the model.

Add Particle

Check this box to use the well as a starting point for particles used in particle tracking (typically backwards from the well to delineate the source water area). Users can customize the number of particles to be released, and the 'release radius' from the well center by navigating to the Simulation Settings tab of the Domain Attributes menu (Conceptual Model Tools > DomainAttr).

Theis

Check this box to calculate drawdown caused by pumping following the Theis solution. The drawdown can be superimposed to the regional flow field (to diisplay the "net head"), or the drawdown can be displayed directly (the user chooses which option after submitting the model for simulation).

multiple Species

Check this box to treat the well as a point source in a multiple species transport model within IGW-NET. (Multiple species transport modeling can be accessed/setup from the Simulation Settings tab in the DomainAttr menu.)

Note that a new well must be saved before it can be selected as a multiple species well.