The drawdowns in an observation well 12 m away from the pumping well, are 2.6 m and 2.9 m, after 8 and 80 min, since pumping started. What is the time since pumping started, for the same drawdown in another observation well 20 m away from the pumping well? The drawdown is 3 m in an observation well 10 m away from the pumping well (drilled in an artesian aquifer) after 10 min of pumping. The time since pumping began to cause a drawdown 2 m in the observation well before the boundary affects the drawdown is given by. Compute the distance from the observation well to the discharging image well associated with the barrier boundary (Fig. The drawdown in an observation well 50 m from the pumped well due to the effects of the barrier boundary for a pumping period of 2 hours is 2 m. A fully penetrating production well has been discharging at a constant rate of 1200 lpm. The aquifer is bounded on one side by a barrier boundary. The coefficients of transmissibility and storage of a non-leaky artesian aquifer are 5 × 10 5 lpd/m and 2 × 10 -4, respectively. If a pumping well (PW) and an observation well (OW) are located near an unknown impermeable aquifer boundary (B), an image pumping well IPW will furnish the equivalent hydraulic flow system. Pumping test data can provide quantitative answers after application of the method of images and non- equilibrium equation. This enables the radial flow equations to be applied to the modified system.Ī common field problem is that of identifying and locating aquifer boundaries. In essence, images enable an aquifer of finite extent to be transformed to one of infinite extent. An image, which may be an imaginary discharging or recharging well, creates a hydraulic system which is equivalent to the effects of a known physical boundary on the flow system. Solutions in such cases are readily obtainable by application of the method of images. When a well is located close to a barrier (impermeable) or recharge boundary, marked deviations from a radial flow system occur. Well Flow near Aquifer Boundaries-Image Wells : Well Flow near Aquifer Boundaries-Image Wells 2. In this article we will discuss about:- 1.
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