A venturimeter is installed in 200mm line to measure the flow rate of water. The manometer used to measure pressure difference is filled with mercury and water will fill the leads above the surface of mercury. The temperature of water remains constant throughout. If the flow rate of water is 85mm3/s and throat diameter is 30mm and venture coefficient is 0.98 . What will be the manometer reading. What will be the power to operate the meter at full load if the pressure recovery is 90% of the differential pressure. The density of water can be taken as 999kg/m3.Specific gravity of mercury can be taken as 13.6 and water as 1 . [6]