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Allowing passage of water into soil pores.It can be measured by conducting some lab tests like Constant Head method Falling Head method.The formula for finding out the coefficient of permeability is

k= [Ql/(i.h.A)] ---- For Constant Head Method

k=al/A(t2-t1)* log(h1/h2) ....... For Falling Head Method

Where

A----- the area of c/s

Q----- the discharge

i------the hydraulic gradient

h------head in m.

a------the certain area of c/s.

t1& t2----- time intervals

h1&h2----- heads at time intervals at t1&t2.

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