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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{d}{K}</math>
<math>t=\frac{d}{K}</math>
Where d is the mean ponding depth
==Drainage time to empty facility==
==Drainage time to empty facility==