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