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It is best applied to calculate the limited duration ponding on the surface of [[bioretention cells]], [[bioswales]] and [[enhanced grass swales]].  
 
It is best applied to calculate the limited duration ponding on the surface of [[bioretention cells]], [[bioswales]] and [[enhanced grass swales]].  
 
To calculate the time (''t'') to fully drain the facility through the footprint area only:  
 
To calculate the time (''t'') to fully drain the facility through the footprint area only:  
<math>t=\frac{nd}{K}</math>
+
<math>t=\frac{d}{K}</math>
    
==Drawdown time to empty facility==
 
==Drawdown time to empty facility==
8,255

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