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*Five percent of the average annual yield can be estimated:
*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>
*<math>Y_{0.05} = A \times C_{vol, A}\times R_{a} \times e \times 0.05</math>
*Y<sub>0.05</sub> = Five percent of the average annual yield (L)
*Y<sub>0.05</sub> = Five percent of the average annual yield (L)
*A = The catchment area (m<sup>2</sup>)
*A = The catchment area (m<sup>2</sup>)