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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, then for 15 days at 800m3/day, five days after the completion of the first pumping period. The second well is pumped at 600m3/day for 20 days. Pumping at the second well started five days after pumping commenced at the first well. Determine the response of the aquifer for 40 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]:
This problem requires you to achieve multiple stress periods from Well 1. To achieve this, multiple wells are added at the same location, and the "Pumping Starts at" field is modified to reflect the start of each stress period. This effectively superimposes one well on another, and their combined effect will appear as a single well.
Add the 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.
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Note, the name field for the two wells that are superimposed (located at 500E, 500N). The 'a' suffix will facilitate in recognising multiple bores in the Grid view. Also, with the mouse, right-click (ctrl-click for MacOS users) on the superimposed well location, will enable the menu option "Send to Back". This will send the current well to the end of the list, thus when you hover over the well location with the mouse, the relevant information will be displayed (see examples below).
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This graph displays the drawdown that occured over the
investigation period (40 days). Between day 0 to 5, the drawdown effects
from Well01 is observed. Between day 5 and 10, drawdown is increased further
from the pumping contribution of Well02. Day 10 shows the start of recovery
as pumping from Well01 is ceased. Recovery continues to Day 15, noting that
the rate of recovry is greater than the pumping effects of Well02. On Day 15
pumping starts from Well01(a) and continues through to Day 30. However, the
period between Day 15 and Day 25 show the effects of combined pumping from
Well01(a) and Well02. Day 25 marks the end of pumping from Well02 and recovery
immediately begins. At Day 30, pumping from Well01(a) stops and the system
recovers through to Day 40.