Drip irrigation is a means of getting water directly to growing plants with very little waste. One method uses a large-diameter polyethylene "mother" tube (10-15 mm i.d.) from which lead many small diameter polyethylene feeder tubes, called drippers, which go directly to the individual plants. What length of 0.5mm tubing will give a flow rate of 20 degrees C water of 6L/day if the pressure is 2 bar in the mother tube, and 1 bar in the surroundings?

Referring to the above problem, what diameter and length of dripper should we use if we want a flow rate of 4 L/h to each plant, and if the desired dripper lenght is to be somewhere between 0.5 and 1.5 m?

Data: the temperature is 20 degrees C; mother tube pressure 200kPA; ambient pressure= 100kPa; drippers are manufactured in 3 diameters: 0.5mm, 1.0mm, and 1.5mm.