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Figure 4-22: Well Input Options menu.

4.3.1 Well Features as Pumping/Injection Wells

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).
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.

To implement a time-varying pumping/injection rate, check the radio box next to ‘Transient’, then LM click
on the ‘Transient’ button. This opens the Transient Data for Pumping/Injection Rate sub-menu (see Figure
4-23). Indicate the starting data and time with the text boxes next to ‘State Date’ (year, month, day, hour).
Then, provide the following inputs for each timestep: TimeN – or the number of days since the starting date
and time; and ValueN – the pumping rate value corresponding to TimeN. The pumping rates may be
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entered in any units; however, if m /day are not used, make sure to enter the appropriate multiplier in the

text box next to ‘Multiplier to m3/day:’. After all desired changes have been made, LM click the ‘OK’
button. Or click ‘Cancel’ to discard all changes and close the sub-menu.

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