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+// elevation that the diameter pump can be situated above the water surface of suction
+clc
+patm=101e3
+pv=1666
+g=9800
+npsh=7.4
+z1=((patm-pv)/g)-npsh
+mprintf('\n Z1= %f m',z1)
+mprintf('\n the pump must be place at approximately %f m above the suction reservoir of water surface',z1)