Quantitative measure of a drainage area $\begin{array}{l}A_e\end{array}$ half-size:

(1)	$\begin{array}{l}\displaystyle r_e = \sqrt{\frac{A_e}{\pi}}\end{array}$

It makes a physical sense of a geometrical average distance from well to the drainage area boundary.

For a circular-shape drainage area with centred well it makes a direct sense of a distance between a well and drainage area boundary.

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See also