Water and Wastewater Terms Beginning D

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detention time

The actual or theoretical (calculated) time required for water to fill a tank at a given flow; pass through a tank at a given flow; or remain in a settling basin, flocculating basin, rapid-mix chamber, or storage tank.

Detention Time (h) = Basin Volume (gal)/ Flow Rate (gal/d) x 24 h/d

or

Detention Time (h) = Basin Volume (m3)/ Flow Rate (m3 /d) x 24 h/d