A pumping test carried out in a 50 m thick confined aquifer resulted in a flow rate of 600 l/min. The thickness of the impermeable layer above the aquifer is 20 m and the original water level in the well was 2 mm below the ground surface (which is also the top of the impermeable layer). Drawdowns in two observation wells located 50 m and 100 m from the well are 3 and 1 m respectively. Calculate: i) The coefficient of permeability of the aquifer, ii) The drawdown in the well, iii) The radius of influence. The diameter of the well is 0.6 m.
A pumping test carried out in a 50 m thick confined aquifer resulted in a flow rate of 600 l/min. The thickness of the impermeable layer above the aquifer is 20 m and the original water level in the well was 2 mm below the ground surface (which is also the top of the impermeable layer). Drawdowns in two observation wells located 50 m and 100 m from the well are 3 and 1 m respectively. Calculate: i) The coefficient of permeability of the aquifer, ii) The drawdown in the well, iii) The radius of influence. The diameter of the well is 0.6 m.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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) A pumping test carried out in a 50 m thick confined aquifer resulted in a flow rate of 600
l/min. The thickness of the impermeable layer above the aquifer is 20 m and the original
water level in the well was 2 mm below the ground surface (which is also the top of the
impermeable layer). Drawdowns in two observation wells located 50 m and 100 m from
the well are 3 and 1 m respectively. Calculate:
i) The coefficient of permeability of the aquifer,
ii) The drawdown in the well,
iii) The radius of influence. The diameter of the well is 0.6 m.
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