Help
Getting Started
Tutorials
FAQ
Downloads
Glossary

Tutorial 2

Problem:  Multiple wells, multiple observation bores, single stress period.

Two production wells are located at coordinates (500m, 500m) and at (750m, 750m) in a confined aquifer 1000-m wide and 1000 m long. The transmissivity and the storativity of the aquifer are 1000 m2/day and 0.0001 respectively.  The first well is pumped for 10 days at 1000m3/day and the second one is pumped at 600m3/day for 10 days. Pumping at both wells started simultaneously. Determine the response of the aquifer for 15 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

popup menu
well dialog


Add two observation bores by selecting "Add Observation Bore..." from the popup menu shown above. Enter the following details.[Note: This dialog box allows you to Add/Edit/Delete pumping and observation bore details in addition to the Investigation Time]

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.

investigation time


Now select the "Start" button and select the "Drawdown" tab to view the results. The drawdown calculated for Obs01 and Obs02 has resulted to -0.088[L]. This demonstrates that the 5 day recovery period (15-10 days) has affected the total drawdown. To observe this select the "Observation Bore" tab on the results page, select Obs01 from the pick-list, then select the "Graph" button. Note: you may have to click on the black area to display the graph for the first time. This graph displays the drawdown that occured over the investigation period (15days). The recovery can be clearly observed after the termination of pumping at day 10.