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