Question

An aquifer pump test was conducted in a confined aquifer where the initial piezometric surface was at elevation 12.45 m, and well logs indicate that the thickness of the aquifer is 14 m. The well was pumped at 28.24 L/s, and after 1 day the piezometric levels at 25 m and 75 m from the pumping well were measured as 10.89 and 11.45, respectively. Assuming steady state conditions, estimate the transmissivity and hydraulic conductivity of the aquifer.

Answer 1

Answer:

T = 0.0088 m²/s

Explanation:

given,

initial piezometric elevation = 12.5 m

thickness of aquifer = 14 m

discharge = 28.24 L/s = 0.02824 m³/s

we know                              

$k = \dfrac{qln(\dfrac{R_2}{R_1})}{2\pi D(H_2-H_1)}$

$k = \dfrac{0.02824 \times ln(\dfrac{75}{25})}{2\pi \times 14 (11.45-10.89)}$                                                                        

k = 0.629 mm/sec

Transmissibilty

T = k × H                          

T = 0.629 × 14 × 10⁻³

T = 0.0088 m²/s