Drainage Engineering and Salt Management

In Ernst's drainage formula, the vertical head loss component is $h_v = q \frac{D_v}{K_v}$, where design drainage coefficient is $q = 0.005\text{ m/day}$, vertical layer thickness is $D_v = 1.0\text{ m}$, and vertical hydraulic conductivity is $K_v = 0.1\text{ m/day}$. The vertical head loss $h_v = 0.005 \times 1.0 / 0.1$ in meters is: