Detention Basin Volume for a Target Time
The inverse of the detention-time tile: the basin volume required to hold flow for a target detention time, volume = target_minutes x flow. 120 min of contact at 350 GPM needs 42,000 gal. Sizes chlorine-contact, flocculation, and sedimentation basins. Ten States Standards; the reviewing authority governs.
Formula and source
Required volume = target detention time × flow (the inverse of detention time = volume / flow). Sizes chlorine-contact (CT), flocculation, and sedimentation basins to a target contact/detention time.
Recommended Standards for Water Works (Ten States Standards), latest edition, by name. EPA Surface Water Treatment Rule (SWTR) 40 CFR 141 Subpart H by section for CT.
Audience
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