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→Determine the required surface area of the storage reservoir
*Begin the drainage time calculation by dividing the area of the practice (''A<sub>p</sub>'') by the perimeter (''x'')
*Begin the drainage time calculation by dividing the area of the practice (''A<sub>p</sub>'') by the perimeter (''x'')
*To estimate the time (''t'') to fully drain the facility:
*To estimate the time (''t'') to fully drain the facility
<math>t=\frac{nA_{p}}{f'x}\times ln\left [\frac{\left (d_{T}+ \frac{A_{p}}{x} \right )}{\left(\frac{A_{p}}{x}\right)}\right]</math>
t = [n<sub>r</sub>' * A<sub>p</sub>/f'*x] * ln[(d<sub>r</sub> + (A<sub>p</sub>/x))/(A<sub>p</sub>/x)]
{{Plainlist|1=Where:
{{Plainlist|1=Where:
*''n'' is the porosity of the filter media,
*''n'' is the porosity of the filter media,