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 piezometric head between the two is 1.4 m. The aquifer hydraulic conductivity is 50 m · day−1, and the porosity is 20%. Estimate the travel time for water to flow between the two piezometers.

time = 224 days

Explanation:

given data

thick = 30 m

piezometers =  280 m

head between  two = 1.4 m

aquifer hydraulic conductivity = 50 m

porosity =  20%

solution

we get here average pole velocity that is get by using Darcy law that is

Va =   ................1

here Va is average pole velocity and k is hydraulic conductivity and is porosity  

here v is =   ...........2

v = 50 ×

v = 0.25 m/day

and here average linear velocity Va will be

Va =  

Va =  

Va = 1.25 m/day  

travel time for water will be

time =  

time = 224 days

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explanation: