A new industrial plant requires a water flow rate of \(5.7 \mathrm{~m}^{3} / \mathrm{min}\). The gage pressure in the water main, located in the street \(50 \mathrm{~m}\) from the plant, is \(800 \mathrm{kPa}\). The supply line will require installation of 4 elbows in a total length of \(65 \mathrm{~m}\). The gage pressure required in the plant is \(500 \mathrm{kPa}\). What size galvanized iron line should be installed?