(1)	$\begin{array}{l}\displaystyle B = \frac{\theta}{2\pi} \cdot A_e \cdot h_a \cdot \phi_a \cdot c_t\end{array}$

where

$\begin{array}{l}\theta\end{array}$	Central Angle of net pay area - aquifer contact
$\begin{array}{l}A_e = \pi \, r_e^2\end{array}$	net pay area
$\begin{array}{l}h_a\end{array}$	aquifer effective thickness
$\begin{array}{l}\phi_a\end{array}$	aquifer porosity
$\begin{array}{l}c_t=c_r +c_w\end{array}$	aquifer total compressibility
$\begin{array}{l}c_r\end{array}$	aquifer pore compressibility
$\begin{array}{l}c_w\end{array}$	aquifer water compressibility

(2)	$\begin{array}{l}\displaystyle B = 1.119 \cdot A_e \cdot h_a \cdot \phi_a \cdot c_t\end{array}$

where

$\begin{array}{l}A_e\end{array}$	$\begin{array}{l}h_a\end{array}$	$\begin{array}{l}c_t\end{array}$
ft²	ft	psi^-1

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