As per IS - 2720 - PART 17 -1986 the coefficient of permeability using constant head method is determined using the relation:
1
\(k=\frac{QL}{Aht}\)
2
\(k=\frac{QLt}{Ah}\)
3
\(k=\frac{Qt}{AL}\)
4
\(k=2.303 \left[\frac{aL}{At} \right]\log \left(\frac{h1}{h2}\right)\)