△h=3-1=2m,P總=P頂+P降+d△h=4+0.5+0.5×2=5.5Kg/cm2
P=ρ△h=ρ(h2-h1)=0.7(20-0.5)=13.65噸/米2=1.365千克/厘米2
N=NEK/η=7.5×1.1/0.54=152.8KW