Question

2. Two piezometers have been placed along the direction of flow in a confined aquifer that is 30.0 m thick. The piezometers are 280 m apart. The difference in piezometer head between the two is 1.4 m. The aquifer hydraulic conductivity is 50 m/day, and the aquifer is composed of soil with a porosity of 30%. Estimate the travel time for water to flow between the two piezometers.

Answer 1

given,

thickness of the aquifer = 30 m

distance between the piezometer = 280 m

head difference between them = 1.4 m

n = 0.3

K= 50 m/day

using Darcy's law

`v = k (dh)/(dl)`

`v = 50*  (1.4)/(280)`

v = 0.25 m/day

average linear velocity

`v = (v)/(n)`

`v = (0.25)/(0.3)`

v = 0.833 m/day

time to travel

=
`(280)/(0.833)`

= 336 days