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| − | *Five percent of the average annual yield can be estimated:
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| − | *<strong>Y<sub>0.05</sub>=  A × C<sub>vol, A</sub> × R<sub>a</sub> × e × 0.05</strong>
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| − | *Y<sub>0.05</sub> =  Five percent of the average annual yield (L)
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| − | *A =  The catchment area (m<sup>2</sup>)
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| − | *C<sub>vol, A</sub> =  The annual runoff coefficient for the catchment
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| − | *R<sub>a</sub> =  The average annual rainfall depth (mm)
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| − | *e = The efficiency of the pre-storage filter
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| − | }}
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| − | {{demo|class=woo|
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| − | * Five percent of the average annual yield can be estimated
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| − | * e =  The efficiency of the pre-storage filter
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| − | }}
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