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→Calculate drawdown time
:<math>t=\frac{nA_{r}}{f'x}ln\left [ \frac{\left (d_{r}+ \frac{A_{r}}{x} \right )}{\left(\frac{A_{r}}{x}\right)}\right]</math>
:<math>t=\frac{nA_{r}}{f'x}ln\left [ \frac{\left (d_{r}+ \frac{A_{r}}{x} \right )}{\left(\frac{A_{r}}{x}\right)}\right]</math>
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''n'' is the porosity of the storage reservoir fill materials
*''n'' is the porosity of the storage reservoir fill material
*''A<sub>r</sub>'' is the storage reservoir footprint area (m<sup>2</sup>),
*''A<sub>r</sub>'' is the storage reservoir footprint area (m<sup>2</sup>),
*''f''' is the design infiltration rate of the native soil (mm/h),
*''f''' is the design infiltration rate of the native soil (mm/h),