GATE Civil Engineering (CE) 2014 Shift 2 Solved Paper

Water is flowing at a steady rate through a homogeneous and saturated horizontal soil strip of 10 m length. The strip is being subjected to a constant water head (H) of 5 m at the beginning and 1 m at the end. If the governing equation of flow in the soil strip is $\frac{{\mathit{d}}^2\mathit{H}}{\mathit{d}{\mathit{X}}^2}=0$(Where x is the distance along the soil strip), the value of H (in m) at the middle of the strip is ___________.