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<math>P=\frac{IiD}{nd+qD}</math>
<math>P=\frac{IiD}{nd+qD}</math>


<h3>Drawdown time</h3>
The design of infiltration facilities should be checked for [[drawdown time]]. Target drawdown time is between 48-72 hours.
To calculate the time (''t'') to fully drain the facility:  
To calculate the time (''t'') to fully drain the facility:  
<math>t=\frac{nd}{q}</math>
<math>t=\frac{nd}{q}</math>

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