A conical draft tube having inlet and outlet diameters \(2.5 \mathrm{~m}\) and \(3.0 \mathrm{~m}\) discharges water at the outlet with a velocity of \(5 \mathrm{~m} / \mathrm{sec}\). The total length of the draft tube is \(10 \mathrm{~m}\) out of which \(3 \mathrm{~m}\) of the length of the draft tubes immersed in water. If atmospheric pressure head is \(10.3 \mathrm{~m}\) of water and loss of head due to friction in the draft tube is equal to 0.2 times of velocity head at the outlet of the tube. Find: (i) pressure head at inlet, and (ii) Efficiency of draft tubes.