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//example 16.10
//calculate the required depth of water to be applied
clc;funcprot(0);
//given
Ecd=20; //electrical conductivity of drainage water
Eci=1.5; //m mho/cm
Dc=55.5; //consumptive use
Lr=Eci/Ecd;
D=Dc/(1-Lr);
mprintf("required depth of water to be applied=%i mm.",D);
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