## A

When the density is a constant, then Equation 9.2(12) is reduced to

dx dy dz

This equation is called the equation of continuity.

### Fundamental Equations

Darcy's law and the continuity equation provide four equations for the four unknowns. Substituting Darcy's law Equation 9.2(9) into the equation of continuity Equation 9.2(13) yields

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