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<math>Y_{0.05} = A \times C_{vol, A}\times R_{a} \times e \times 0.05</math>
<math>Y_{0.05} = A \times C_{vol, A}\times R_{a} \times e \times 0.05</math>
where:
where:
Y<sub>0.05</sub> &#61;  Five percent of the average annual yield (L)
{{plainlist|
A &#61;  The catchment area (m<sup>2</sup>)
*Y<sub>0.05</sub> &#61;  Five percent of the average annual yield (L)
C<sub>vol, A</sub> &#61;  The annual runoff coefficient for the catchment
*A &#61;  The catchment area (m<sup>2</sup>)
R<sub>a</sub> &#61;  The average annual rainfall depth (mm)
*C<sub>vol, A</sub> &#61;  The annual runoff coefficient for the catchment
e &#61; The efficiency of the pre-storage filter
*R<sub>a</sub> &#61;  The average annual rainfall depth (mm)
*e &#61; The efficiency of the pre-storage filter}}




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