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+

+//example 3.5

+//calculate Field Capacity

+clc;

+//Given

+d=2;            //root zone depth

+Wc=0.05;        //existing water content

+gammad=15;      //dry density of soil

+gammaw=9.81;    //unit weigth of water

+Vw=500          //water applied to the soil

+Wl=0.1;         //water loss

+A=1000;         //area of plot

+Vu=Vw*0.9;      //volume of water used in soil  

+Wu=Vu*gammaw;   //weigth of water used in soil

+Ws=A*d*gammad;  //total dry weigth of soil

+Wa=Wu*100/Ws;   //percent water added

+Fc=Wc*100+Wa;   

+Fc=round(Fc*100)/100;

+mprintf("The Field Capacity of soil is=%f percent.",Fc);