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Tutorial 1

Problem: Single well, multiple observation bores, single stress period.

A production well is located at coordinates (500m, 500m) in a confined aquifer 1000m wide and 1000m long. The transmissivity and the storativity of the aquifer are 1000 m2/day and 0.0001 respectively. The well is pumped for 10 days at 1000m3/day. Determine the response of the aquifer for 30 days since the beginning of pumping at an observation bore at coordinates (600m, 500m), and another at (700m, 500m).

Solution:

In WIDE, start a new model by selecting the [File | New] menu option.

Add the grid and aquifer property details by selecting the [Edit | Grid/Aquifer Properties...] menu option. In the Properties dialog add the following data for the two tabs [Note: Select the appropriate aquifer type prior to setting the Aquifer Properties. Certain properties are only enabled for specific aquifer types]:

grid coordinates   aquifer properties

Add a pumping well by right-clicking (ctrl click for MacOS) on the grid and entering the pumping bore details. Note: A pumping well cannot be positioned directly on a node. This will cause a numerical instability when calculating the node's drawdown. By default, WIDE will relocate the well by 0.1[L] north and east.

popup menu
well dialog

Add two observation bores by selecting "Add Observation Bore..." from the popup menu shown above. Enter the following details.

obs01   obs02

Again from the popup menu, select the "Edit Wells/Bores..." option. In the bottom right of the dialog, there is an option to enter the Investigation Time. Select that field and enter the following data. [Note: This dialog box allows you to Add/Edit/Delete pumping and observation bore details in addition to the Investigation Time]

investigation
time

Now select the "Start" button and select the "Drawdown" tab to view the results. In this case, the resultant drawdown is 0.0. This means that at T=30day (20 days after the end of pumping), the groundwater levels at the observation bores have fully recovered.