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+clear
+clc
+//Example 10.7 PIPE SYSTEM WITH COMBINED HEAD LOSS
+//From energy equation, z1=z2+hL
+z2=130; //[m]
+g=9.81; //[m/s^2]
+L=197; //[m]
+D=0.15; //diameter[m]
+A=%pi*D^2/4; //area[m^2]
+Q=0.028; //[m^3/s]
+V=Q/A //[m/s]
+v=4*10^-5; //[m^2/s]
+//Reynolds number
+Re=V*D/v 
+//Re>3000, flow is turbulent
+//Minor head coefficients
+Ke=0.5; //entrance
+Kb=0.19; //bend
+KE=1.0; //outlet
+//Swamee-Jain equation, ks/D is neglected
+f=0.25/(log10(5.74/Re^0.9))^2
+//head loss
+hL=(V^2/(2*g))*(f*L/D+2*Kb+Ke+KE)
+z1=z2+hL //[m]
+printf("\nThe elevation of the oil surface in the upper reservoir = %.f m.\n",z1)