A closed tank contains air and oil (specific gravity = 0.8). A pressure gauge connected to the air space above the oil shows a reading of 60 kPa (gauge). If the depth of the oil is 2 m, what is the gauge pressure at the bottom of the tank? (Take g = 10 m/s2).

What will be the value of Chezy's constant 'C' if the velocity of flow 'V' is 1.506 m/s, bed slope is 1 in 2000 and hydraulic mean depth 'm' is 1.5 m?

Water is flowing through a rectangular channel. The width and depth of the channel are 830 cm and 140 cm, respectively. If the discharge through the channel is 600 cusecs, then the specific energy of flowing water and the value of minimum specific energy are ______ and ______, respectively.