A drip system is used to irrigate banana crops using emitters (drippers) at a capacity of 4 L/h. There are 2 submains in the system with a length of 150 m each. There are 15 laterals on each submain, and the number of emitters on each lateral is 100. Lateral length is 75 m, and laterals have a diameter of 20 mm. Decide diameter of the submains if pipe material is PVC and head at the tail end of the lateral is 0.75 m. Water density and dynamic viscosity are 1000 kg/m3 and 10-3 Ns/m2 . Use one of the given available PVC pipe diameters (32, 40, 50 , 65, 80, 100, 125 mm)