Changes

:<math>d_{r}=a[e^{\left ( -bD \right )} -1]</math>

:<math>d_{r}=a[e^{\left ( -bD \right )} -1]</math>

Where

Where

:<math>a=\frac{Ar}{x}-\frac{i Ai}{x f'}</math>  

:<math>a=\frac{A_{r}}{x}-\frac{i\times A_{i}}{x\times f'}</math>  

and <br>

and <br>

:<math>b=\frac{xf'}{nAr}</math>

:<math>b=\frac{x\times f'}{n\times A_{r}}</math>

(The rearrangement to calculate the required footprint area of the facility for a given depth assuming three-dimensional drainage is not available at this time. Elegant submissions are invited.)<br>

(The rearrangement to calculate the required footprint area of the facility for a given depth assuming three-dimensional drainage is not available at this time. Elegant submissions are invited.)<br>