Based on a small-scale measurement for a pump with a flow rate of 4.4104m3/s and an impeller diameter of 20mm, select a new impeller size that will deliver a pressure head that is 7 times the pressure head of the small-scale model. Give your answer in mm to 1 decimal place. The following equations may be useful, where their symbols have the usual definitions. V1V2=d1d2h1h2=(d1d2)2