Answer Happy

The image shows a one dimensional problem where water is entering and leaving a soil column that is Z m deep, has a volumetric water content of 8 and porosity . Water enters as precipitation P[m/day], and leaves as evaporation E [m/day] and deep drainage D [m/day). Which of the following equations for , the relative water content, is a sensible water balance equation (assuming constant density) for this problem? E P z so D
a. de -=P-E-D dt Ob. de OZ == -=P-E-D dt c. do de (P-E-D! dt O d. Z =P-E-D dt ds 02-=P-E-D dt dᎾ e.