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+// Example 9_7
+clc;funcprot(0);
+// Given data
+h=100;
+Q=10;
+n_t=.85;
+D=1.5;
+L=300;
+delta_t=93.99;
+epsilon=1*10^-4;
+nu=1.0*10^-6;// The kinematic viscosity in m/s^2
+rho=1*10^3;// The density of water in kg/m^3
+g=9.81;// The acceleration due to gravity in m/s^2
+
+// Calculation
+V=(4*Q)/(%pi*D^2);// m/s
+Re_D=(V*D)/nu;// Reynolds number
+function[X]=frictionfactor(y)
+    X(1)=-(2.0*log10(((epsilon/D)/3.7)+(2.51/(Re_D*sqrt(y(1))))))-(1/sqrt(y(1)));
+endfunction
+// Guessing a value of f=1*10^-2;
+y=[1*10^-2];
+f=fsolve(y,frictionfactor);
+K_f=f*((L)/D);// The head loss coefficient
+SigmaK=3.681;
+deltah_1=SigmaK*((V^2)/(2*g));// The head loss in m
+P=n_t*(rho*Q)*g*deltah_1;
+P=P/10^3;
+printf("\nThe head loss in the piping,deltah_1=%1.3f m \nThe power produced by the turbine,P=%3.0f kW",deltah_1,P);